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Geomodel 2017
- Conference date: September 11-14, 2017
- Location: Gelendzhik, Russia
- Published: 11 September 2017
1 - 100 of 131 results
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Robust Non-Stationary Signature Deconvolution
Authors M.S. Denisov and A.E. FirsovSummarySignature deconvolution is a widely used tool in seismic data processing. Sometimes its application leads to severe noise increase. This disadvantage is explained by the fact that filter adaptation is performed to the theoretical or measured signature, as the filter is subsequently applied to the data recorded. To achieve robust filtering, a data-adaptive element should be incorporated into the scheme. A threshold-based criterion is introduced to detect noisy frequencies and a special compensation filter is designed to attenuate them. The efficiency of the algorithm is demonstrated on a real marine data example
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The Use of Seismic Cdp-3D for Indirect, Evidence for Fluid Migration of Hydrocarbons from the Bazhenov Formation in the Lower Cretaceous Deposits of Western Siberia
Authors V.N. Borodkin, A.R. Kurchikov, V.I. Samitova, A.S. Nedosekin, A.V. Lukashev and O.A. SmirnovSummaryThe same regularity in the change of physico-chemical properties of fluids and phase zoning of hydrocarbons in Jurassic and lower Cretaceous sediments.
On the basis of the organic hypothesis of petroleum formation and considering the Bazhenov shale as neferheperura thickness, in this case, the zone of anomalous sections of the Bazhenov formation are considered as a positive criterion for predicting oil and gas potential of Achimov strata due to the strengthening of processes of migration of hydrocarbons from the Bazhenov formation above the cut. Characteristic is the presence in the interval abnormal structure “zones fluid-dynamic unloading”. Intraformational faults and “discharge zone” are clearly visible on the seismic attribute “Symmetry” along the OGB.
The presence of abnormally-high of potovyh pressure (abnormal high pressure) in the Achimov sequence is also one of the indicators of the migration of hydrocarbons from the Bazhenov formation, because oil deposits in the past all with AHP
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Forecast of a Possible Oil-Gas Productivity of the Silurian Deposits of the South-East Part of the East-European Platform
Authors B.A. Solovjev and S.P. LevshunovaSummarySolid high-metamorphized bitumens accumulations (kerites) were discovered in the Silurian deposits in the south-east part of the East-European platform in the surrounding zone of folded Ural. It proves a possible former oil accumulation here. Analysis of geological and geochemical data is performed. A structure of carbonate shelf deposits is described. Taking into account the discover of oil fields in the Silurian deposits in the Timano-Pechora region it allows to draw a preliminary conclusion about possible role of the Silurian shelf carbonate deposits in oil and gas potential forming in this region.
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Features of the Structure and Petroleum Potential of the Daginsky and Okobycay Deposits of the Tungor Field
Authors V.N. Stavitskaya, O.S. Makhova, V.A. Poroscun, R.S. Melnikov and A.G. PlotnikovSummaryAs a result, the horizons of the Dagin deposits (XXI, XXII, XXIII, XXIV, XXV, XXVI), the Okobycay deposits (XIII, XIV, XV, XVI, XVII, XVIII, XIX).
According to the GIS data, promising intervals of possible reservoirs in the Daginskian sediments have been identified, which were discovered in seven wells. The character of saturation of the separated reservoirs is estimated.
Dynamic analysis was performed, various dynamic seismic attributes were calculated to establish correlation dependencies between seismic attributes and petrophysical parameters of the reservoirs in the wells.
The results obtained will be used for further work on the creation of a permanent geological and technological model for the purpose of monitoring the development of the field.
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Background Petroleum Potential of Riphean Deposits of Northeastern Slope of Baykit Anteclise
By A. ProtskoSummaryThe paper considers structure of Riphean deposits of northeastern slope of Baykit anteclise in the light of new data obtained from drilling wells Chunkinskaya 282. On the basis of the correlation performed by the author on seismic and well data identified border spread Riphean carbonate sediments on prevendian erosional surface. A correlation of Riphean deposits penetrated by the well Chunkinskaya 282, with deposits of the Riphean Yurubcheno-Tokhomskaya oil and gas accumulation area.
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About Seismic Deconvolution and Some Opportunities of Results Verification
By D.B. FinikovSummaryOpportunities of deconvolution results verification: problems of signal form estimation with the help of joint analysis of deconvolution results & raw data are discussed.
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Use of Modelling in the Interpretation of DNME Data to the Improving Forecast Accuracy
Authors S.J. Garina, S.A. Ivanov, V.V. Vladimirov and I.Yu. PesterevSummaryIn DNME, the estimation parameters are the polarization parameters and electrical resistivity. As is well known, the IP anomalies can be associated not only with the presence of HC, but also with lithological changes and three-dimensional heterogeneities in the overburden. We also know about the ambiguity of the inverse problem solution. The use of modelling of various geological situations works towards a solution of controversial questions about the connection of the allocated polarization objects with HC or another source. For this purpose GeoEM software (development of M.G. Persova) is designed to solve three-dimensional geoelectric exploration problems, as well as a program ESDesigner for modeling of a deeper sectional streamer position and calculating of direct problem (development of I.Yu. Pesterev) are currently used in the SGRPC LLC. The results obtained from the synthetic models in comparison with the results of inversion and a priori data made it possible to take into account the degree of influence of the large water layer on the DNME parameters and to select target polarizing layers. It is shown that the vertical zonality of the IP fields’ positions in the section and the polarizable layers corresponding to them can be reversed.
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New Local Structures of the Near-Yamal Shelf of the Kara Sea with High Hydrocarbon Potential
More LessSummaryDespite of high density of seismic study of the near-Yamal part of the Kara Sea before 2012 shallow water junction zone –so called transition zone – was not examined for practical purposes. During 2012 – 2014 FSBI VNIIOkeangeologia together with JSC MAGE carried out contemporary regional researches on the near- Yamal shelf of the Kara Sea. It allows to study the transition zone along the western shore of the Yamal peninsula – from the island Beliy in the northern part to the Baydara Bay in the southern one. Seismic reflection studies, sub-bottom profiling, gravity survey and water and sediment sampling were included in this study. One of the results of the researches is discovering of the two new local structures in the transition zone. Wave field analysis along seismic profiles made possible to estimate the size of these structures and detected evidences of its hydrocarbon potential. Results of the geochemical study show high concentrations of the direct oil indications inside local structure areas. Expected deposits are located on the depth up to 4 km. Short haul to the shore and shallow water of the sea make the local structures as high potential places for the detailed researches in the nearest future.
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Middle Miocene Seismostratigraphic Complex (SSC) in Pannonian Basin
Authors T.V. Olneva and E.A. ZhukovskayaSummaryThese studies of Middle Miocene seismostratigraphic complex (SSC) in Pannonian basin are a logical continuation of the work presented at the conference “Geomodel-2016”. A detailed analysis of seismostratigraphic complex allows to open a new level of the target horizons interpretation.
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Seismogeological Model of the Structure of Riphean Deposits Within the Kureyskaya Syneclise
Authors S.V. Kotova, G.D. Uhlova and A.N. ProtskoSummaryA uniform network of regional composite surveyes for seismic profiles has been created. The main structural features of Riphean complex are considered. Three types of seismic recording are defined. The zone of lack of Riphean deposits is specified. The stratigraphic binding and correlation of the reflecting horizon R4 are performed. A structural-tectonic and predictive scheme of the pre-Vendian erosion surface was constructed.
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Possibilities of Engineering-Seismic Exploration in the Search for Ground Water Reservoirs in Difficult Mountain Conditions
Authors B.A. Kanareykin, E.Y. Goshko, E.V. Mosyagin, A.S. Salnikov and A.V. SagaydachniySummaryEngineering-seismic studies of the shallow subsurface in the Teberda River valley (Karachay-Cherkess Republic) were carried out with the aim to rectify spatial boundaries of ground-water deposits in the river paleocut, being a promising target for water by the results of previous prospecting.
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Methodical Justification of Differentiation of Productive Layer by Methods of the Geological Field and Statistical Analysis
Authors D.Y. Chudinova, Y.A. Kotenev and S.K. SultanovSummaryIn work methodical justification of differentiation of productive layer is described by methods of the geological field and statistical analysis. An object of a research is productive layer of one of large-scale deposits of Western Siberia of the North of the Surgut arch. The algorithm of differentiation includes ranging of layer on lithofacies zones, about use of electrofacial models on relative values of the PS-method a̍ps, allocation of classes of heterogeneity, the characterizing heterogeneity of an object and ranging of a well stock by methods of neural network modeling. The received distribution has been correlated to cards of development of efficiency. Comparison has shown that the maximum coefficients of efficiency reflect position of sandy bodies, such as bars and underwater shaft in the spatial relation. The maximum concentration of residual stocks and bad production of productive layer belongs to the mudded heterogenic zones of alongshore gullies and a prefrontal zone the beach.
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Universal Algorithmic System for Geophysical Objects Appoximation Based on Fourier-Splines
More LessSummaryThe universal algorithm of geophysical maps with faults synthesis for seismic objects is developed. The new method concludes the approximation of both regular and non-regular data with the new finite functions class called “Fourier-splines” having great advantages versus well-known approaches particularly cubical B-splines.
The innovation of the new solution is 3D {xyz} Fourier-splines arrays synthesis on the parametrical 2D {uv} grid aligned along the profiles grid. The fault surfaces may be built additionally on the corresponding local parts of profiles similarly to isolines in automatic mode.
The numerical algorithm is optimized with utilization of more efficient version of square-root method of linear systems resolution and implementation on the base of parallel processing technique NVIDIA CUDA. As a result we have unified multi-dimensional method of different objects synthesis in the best splines from the arbitrary non-regular data.
The new advanced solution has the next advantageous features versus the known ones:
- the unified approach to maps and faults synthesis providing arbitrary complex 3D models including maps of z-horizon type (with local negative trends);
- adapting the parametrical grid to profile grid providing to the most precise approximation;
- the absence of edge contouring (masking), softened map edges are formed intrinsically.
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Lithofacies Reconstruction of the Lower-Middle Jurassic Sediments of the Yugansk Zone in Western Siberia
Authors V.N. Zeltser, N.V. Taninskaya, V.V. Shimansky, M.A. Myasnikova, N.J. Vasiliev and I.S. NizyaevaSummaryOn the basis of litho-facial studies both lithofacies and depositional environments have been distinguished in the Lower-Middle Jurassic deposits of the Yugansk zone of the Western Siberia. Detailed analysis of core material showed that sedimentation occurred mainly in the conditions of alluvial plain in the extreme North-Western and Eastern parts of the territory turning to the upper delta plain occasionally flooded by the sea. High properties reservoirs are associated with facies point bars of straight channels, delta channels and crevasse splays.
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Lithological Characterization of Khadum Formation Sections in East Caucasian Region
SummaryRecently North Caucasian Oil and Gas Province is one of the perspective areas for hydrocarbon reserves replenishment. As regards, unconventional perspective objects in Khadum and Batalpashinskiy deposits are new targets for exploration and development. That is why lateral heterogeneity of deposits and reservoir model are crucial work issues. In this purpose, a series of lithological and sedimentological investigations carried out. Based on obtained results lithological characterization of Khadum formation sections was build. In addition, there was conducted a comparison for two structural zones – East Stavropol Depression and Prikuma Uplifting Zone
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Reducing Geologic Uncertainty in Seismic Interpretation: Case Study of Lower Mannville Channels in Western Canadian Sedimentary Basin
Authors V. Rybakov and J. BockSummaryWhen dealing with seismic and well data interpreters often face certain challenges characteristic of both data types. Well data is very detailed vertically and gives rich detail in specific locations, but the rest of the field remains unknown at that level of detail. Seismic data is almost nearly the opposite; it provides very good resolution laterally, but is much less detailed vertically and typically doesn’t provide a direct measurement of physical properties of interest. Combining both data types, geologic models capable of filling in the gaps between seismic and well data sets have become exceedingly valuable. In this investigation we studied a number of uncertainty reducing workflows associated with both forward and inverse modeling techniques. How can we make predictions as to what attributes will uniquely discriminate between reservoir and nonreservoir rocks and fluids with confidence? Forward modeling of geophysical data uses well-defined geological models to calculate specific seismic field responses. Using available log data combined with geologically reasonable model constraints, geomodelers may construct a number of modeled seismic responses that can be used to validate or annul various working geologic models. In contrast, geophysical inverse modeling techniques attempt to construct a physical property model based off a geophysical response.
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New Interpretive Seismic Models Are an Important Tool for Obtaining Migrated Images of the Geological Environment
Authors V.I. Bondarev and S.M. KrylatkovSummaryThe model of a horizontally layered medium, lying in the basis of obtaining geological results, using technology CDP is a strongly simplified assumption about the structure of the real world.
Previously, the authors proposed a new approach for obtaining migrated seismic images of the geological environment, according to the source, data from more than one method of superposition. It is based on the use of more complex models seismic interpretation geological environment - environment with the inclined reflecting boundary.
A distinctive feature of the proposed approach to obtain seismic images of the geological environment is another method of accumulating information about the environment in those parts of the section, which really could be the sources of reflections. This approach allows to obtain depth and time-migrated seismic image of the geological environment on the results of standard seismic survey, obtained by the method of multiple overlapping seismic 2D and 3D.
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Migration of Seismic Data for Multi-Layered Fractured Geological Media Using Elastic Approach
Authors V.I. Golubev, O.Y. Voinov and I.B. PetrovSummarySeismic surey process is the most common technology for prospecting and exploration of oil and gas deposits around the world. It allows to reconstruct the structure of the subsurface are on the basis of day surface movements caused by vibrational or explosive sources, due to the reflection of volumetric seismic waves from geological heterogeneities. Two different problems of seismic survey can be distinguished: inversion and migration. Development of new approaches to the solution of the latest one is the goal of this research.
This article is devoted to the problem of seismic imaging of layered fractured geological media. Authors proposed a new approach to the subsurface area image creation based on the numerical solution of the linear elasticity system. Adjoint operator approach was used, direct and adjoint problems were solved numerically by the grid-characteristic method on hexahedral meshes. Developed method allows to use arbitrary background models, even fractured. It was successfully applied to the model of the multi-layered fractured geolgical medium.
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The Possibility of the Migration Transformation for the Evaluation of the Attributes of Wave Fields
Authors A.V. Shalashnikov and D.B. FinikovSummaryIdentification of dynamic parameters with depth coordinates is an inevitable stage of interpretation of wave fields. Migration is a necessary tool along with the construction of a velocity model. We propose a new method, called attribute-based migration allows to obtain many important seismic attributes, using the kinematic parameters of reflected waves is directly related to the area of their formation in the deep field.
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Analysis of Rock Saturation Character in the Heterogeneous Oil Reservoir of the Priobskoye Field Formation Ac10
Authors I. Ratnikov, N. Yarkova and E. RomanovaSummaryThe basic factors influencing the nature of non-uniform hydrocarbon (HC) saturation of the bed AC10 are considered. The geological nature of heterogeneity depending on the degree of the reservoir properties variability is analyzed. It is also studied how microheterogeneity influences on the rocks saturation and also the character of the heterogeneity effect upon the physical properties is investigated.
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Localization of Cavernous High-Capacity Interlayers in the UTM Riphean Reservoir
Authors A. Kozyaev, A. Merzlikina, D. Petrov, V. Shilikov and A. TyzovskaySummaryWe present a new approach to localization of the highly saturated zones of reservoir of rifei. The method is based on the processing of the scattered seismic energy. In this paper, we present the results obtained for an Eastern Siberian oilfield.
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Arctic Geophysical Project
Authors V.S. Mogilatov and M. EpovSummaryThe basic, fundamental problem to be solved when planning geological and geophysical research works in the Arctic consists in the challenge of dealing with the object covered by the deep sea waters which, partially, topped by multiyear ice. Such a "double pack" immediately rules out a multitude of ground-based technologies, aircraft- and satellite-based remote sensing surveys, as well as many achievements of the marine geophysics.
However, our approach implies giving up standard procedures, sacrificing their mobility in favor of arranging a complex, but effective experiment, to ensure their sustainable movement over the investigated medium occurring under the ocean floor, at the expense of the polar ice drifting.
Furthermore, we offer a specific set of methods, each specifically constructed or modified for effective sounding from the surface of drifting ice and penetrating masses of seawater. This complex is open for supplementing it with other geophysical methods for higher efficiency of the involved operations under the considered conditions.
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Modern Mathematical Support of the Transient Electromagnetic Soundings
Authors V.S. Mogilatov and A. ZlobinskiySummaryIt is necessary to support mathematically any novations in the electromagnetic methods by the transient field, which appear due to peculiar methodological considerations either under process conditions, or just under terrain conditions (complex wilderness, sea, densely populated cultivated area). Electrical exploration has a steady use in the sea, and we offer new mathematical support. The operational three-dimensional approach is a large problem in the transient geoelectromagnetic soundings. We are developing the new solutions using the Born approximation and the tomographic approach.
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Accounting for the Hall Conductivity in the Electromagnetic Sounding of the Earth
Authors V.S. Mogilatov and V. PlotkinSummaryDue to the presence of strong geomagnetic field, electric currents within the Earth are affected by the appearance of the Lorentz force producing additional extrinsic currents, which contribute to the total measured electromagnetic field. This effect, well known in physics as the Hall effect, is totally ignored in conventional geoelectric and geoelectromagnetic exploration. However, even very general and preliminary analysis shows that this effect is markedly present in geoelectromagnetic signals and, if not being counted, might lead to difficulties or to significant errors in the interpretation. In particular, the Hall effect causes the appearance of the effective anisotropy and magnetization of rocks, which are originally isotropic and nonmagnetic.
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Evaluation Generation Potential and Geological Resources of Hydrocarbons of Low Permeability Shale Strata of the Maikop Series Ciscaucasia
Authors R.N. Mustaev, V.Y. Kerimov and S.S. DmitrievskySummaryThe report focuses on the evaluation and generation potential geological resources of hydrocarbons of low permeability shale strata of the Maikop suite Ciscaucasia - one of the most promising for the detection of hydrocarbons “shale” in Russia. For the first time in the region carried out a quantitative evaluation of the hydrocarbon potential of the generation and Khadum Batalpashinsk deposits.
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The Effect of Leaching Salts on Salinization Reservoir Properties of Terrigenous Rocks of the Reservoir B13, Eastern Siberia
SummaryThis work examines the importance of petrophysical studies salinization core, as it is a parameter that determines the strength and integrity of the breed in the process of development. Integrated assessment salinization manifold requires the use of petrophysical studies, chemical analysis of formation water, the method of 3D imaging that will allow us to represent the structure of the pore space and its changes in the process of leaching of salts.
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Assessment of the Oil and Gas Potential of the Maikop Series Ciscaucasia Based on the Results of Hydrocarbon Systems Modeling
Authors R.N. Mustaev, S.G. Serov, U.S. Serikova, L.I. Kerimova and D.D. IsmailovSummaryBased on the results of modeling the generation processes of emigration and accumulation of hydrocarbons reconstructed the history of oil and gas accumulation in the sedimentary cover in the region. Determine the location of possible hydrocarbon generation sources in the sedimentary cover, migration paths, the phase composition of HC, the intensity of hydrocarbon saturation within individual zones and tectonic structures.
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Erosion Basement Heights at the Northern Slope of the Nepa Arch, the Nepa-Botuoba Anteclise (Suolakh Ridge)
By P.I. NovikovSummaryThe author briefly considers the history of studying the crystalline basement heights at the northern slope of the Nepa arch and the basement’s influence on the oil and gas content of the overlying carbonate sediments.
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Results of Geochemical Research of Asphaltites of the Ivanovo Deposit of the Orenburg Region
Authors M.V. Zaharchenko, V.Y. Kerimov, R.N. Mustaev, M.M. Lyushin and I.M. SalihovaSummaryBased on the study, it was revealed that the initial material for the formation of asphaltite of the Ivanovo deposit was oil generated at the stages of catagenesis corresponding to the beginning of the main phase of oil formation. Sedimentation and diagenesis took place in coastal-marine conditions in a reducing environment in the zone of hydrogen sulfide contamination.
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Lithogenetical Criteria of Reservoir Prediction in the Riphean Deposits of the Yurubcheno-Tokhomskoye Field, the East Siberia
Authors M.N. Grislina, N.V. Taninskaya, V.N. Zeltser, M.A. Myasnikova, N.Y. Vasiliev and S.V. ShimanskySummaryOn the basis of sedimentologycal, litho-petrographycal and facial studies both lithotypes, facies and depositional environments have been distinguished in the Riphean sedimentary sequences of the Yurubcheno-Tokhomskoye oil-gas field of the East Siberia. It has been established that the high property reservoirs relate to stromotolite buildups facies widely distributed in the Yurubchen, Kuyumbin and Dolgoktin Formations of the Upper Riphean.
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Genetic Characteristics of Oils from the Orenburg and Saratov Deposits Based on the Results of Biomarker Studies
Authors M.V. Zaharchenko, M.M. Lyushin, A.S. Nefedova and I.M. SalihovaSummaryBy results of researches the similarity of biomarker parameters of Saratov and Orenburg oils by origin and geological age is revealed. For most of the genetic parameters, the oil of the Orenburg field is of type A1, of marine origin, generated under reducing conditions; Oil is characterized by an elevated metal content. Petroleum of Saratov deposits is generated under sub-regenerative conditions in coastal-marine horizons; In them there are practically no metal-containing compounds.
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Conditions of Formation of Hydrocarbon Accumulations in Uplift-Thrust Structures in the East of the Southern Part of the Preurals Foredeep
Authors A.V. Osipov, V.Y. Kerimov, N.B. Kuznetsov, A.V. Bondarev, R.N. Mustaev and A.S. NefedovaSummaryThe article describes the stages of development of the eastern side of the southern segment of the PreUrals foredeep and the zone of the Urals advanced folding zone and mechanisms for the formation of hydrocarbon accumulations in uplift-thrust structures of these zones. To restore the succession of the flow of shaggythrust processes, which are associated with the origin and development of the Urals advanced folding zone, the technology implemented in the Dynel software of Schlumberger was used.Based on the results of the research, a conceptual model for the formation of hydrocarbon accumulations in uplift-thrust and sub-slip zones has been created. It is shown that uplift-thrust dislocations should be considered as the most important oil and gas control elements in the region.
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Geochemical Characteristics of Source Rocks of the Southern Part of the Preurals Foredeep
Authors A.V. Osipov, M.V. Zaharchenko, M.M. Lyushin, A.S. Nefedova and L.I. KerimovaSummaryThe article presents the results of the interpretation of a complex geochemical study of the organic matter of samples of different age of Paleozoic rocks from wells in the southern part of the PreUrals foredeep. It was found that in all the studied oil and gas complexes (Lower Devonian - Frasnian, Frasnian - Tournaisian, Visean - Bashkir and Lower Permian) have their own syngenetic source rocks characterized by different generational potential and confinement to a particular litho-facies zones.
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A Monitoring System of Ice Conditions to Support Geological Surveying in Arctic Seas
Authors V.A. Volkov, E.E. Kazakov, D.M. Demchev, N.Y. Zakhvatkina and V.S. KhmelevaSummaryAn approach to creation of automated system of operational monitoring of ice conditions for geological surveying in the Arctic seas is considered. The monitoring system includes methods for automated classifications of sea ice types, sea ice drift tracking and iceberg detection. Open radar remote sensing data from space is used as the primary data source. To integrate data and algorithms specialized information system is established.
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Construction of Sedimentary Models of the Osa and the Botuoba Horizons (Nepa Arch of the Nepa-Botuoba Anteclise)
Authors D.A. Batmanov, V.N. Bespechnyi, G.D. Uhlova, S.V. Kotova and P.I. NovikovSummaryThe main aim of this work was seismic facies analysis of sediments of the OSA and the Botuoba horizon. Method of seismic facies analysis helps to reduce the percentage of wrong properties prediction in interwell space and to reduce the degree of uncertainty. In this paper we consider the example of predicting reservoir properties terrigenous and carbonate formations according to seismic surveys 2D for this structurally complex region like the NBA.
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Peculiarities of Azeri-Chirag-Guneshli Field Compartmentalization
Authors Y.A. Dyakonova and D.Sh. MachukaevSummaryThe article provides a detailed analysis of the structure and tectonics of the unique Azeri-Chirag-Guneshli oil and gas condensate field based on the integration of 3D seismic and well data. Studies have made it possible to clarify the concept of the formation and development of faults at the Absheron threshold of the South Caspian oil and gas basin. The obtained results indicate the necessity of modeling such deposits as one geological object.
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Density Cube Prediction in Carbonate Layer to Detect Dolomitization Based on Deep Neural Networks
Authors P.F. Popova, I.I. Priezzhev and S.V. EgorovSummaryIn presentation shows example density cube prediction in carbonates in Caspian sea area to detect dolomitization zones using deep neural network. The prediction is based on full stack seismic cube and several well logs. To train deep neural networks we used hybrid training technique based on a combination: deep neural network input generalization for first layers, genetic algorithms together with a gradient methods and Tikhonov regularization. Using deep neural network allow to build prediction operator with high level of the power of freedom and as result good quality of the prediction.
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Jurassic Sequence Stratigraphy of the Central Caspian Basin
Authors I.D. Agapitov, S.S. Kosova, S.G. Shilkin, A.A. Belova, A.V. Gorban and I.N. KerusovSummaryThe Middle Caspian offshore is one of a few provinces of Russian shelf with not only explored and proved petroleum resources but also where active production is taking place. Main oil and gas bearing complexes are Jurassic terrigenous-carbonate and Cretaceous terrigenous. Jurassic deposits contain 88% of petroleum resources within the Sarmat-Kvalyn anticline zone which is a part of Prikum-Central-Caspian system of anticlines and troughs. Current level of exploration gives reasonable level of confidence to identify large and medium structures. New profitable prospects are believed to be found in structural-tectonic and nonanticline traps. Due to good seismic coverage, irregular distribution of drilled wells, long distances between some of zones and lateral changes of thickness and lithology of Jurassic deposits application of sequence-stratigraphy analysis is necessary. With application of this method Jurassic deposits were divided into sequences of 2nd and 3rd order and parasequences for the first time in area of Middle Caspian. Identification of system tracts allowed to describe character of sedimentation in Jurassic basin and to define reservoirs and potential seals and their distribution.
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Modern Approaches to Feasibility Study of Oil and Gas Projects and the Conditions of Cost-Effective Development. The Examples of Versatile Projects Estimations
Authors D. Milyaev and S. SukharevSummaryThe geological exploration consistency lies in the successive study of a sedimentary basin, an oil and gas accumulation zone, exploration targets, and than a field. Thus, as the knowledge is being gathered, the studied territory is repeatedly localised, geological approaches and criteria evolve, the exploration maturity improves, the uncertainty level decreases, and principally different management tasks are set. The economic appraisal, as a constitutive of the elaboration of corporate solutions, shall consider the specifics described. In particular, for two different types of hydrocarbon objects and geological exploration stages, there must be different objectives, tasks, methods, and sought indicators of economic analysis. The authors suggest a conceptual methodological approach to defining feasibility of diverse oil and gas projects and the conditions of cost-effective development, and consider its application on various scales: to a macroregion (southern Siberian Platform), separate highly promising zones within a macroregion (Baikit, Nepa-Botuoba, etc.), prepared and identified structures (Kapaevskaya and Katskaya-2 within the Verkhnekatangsky block), and a developed field.
The authors conclude that feasibility study methods must be applied correctly in terms of methodology.
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Forming Conditions, Oil Potential and Ways to Enhance Coefficient of Oil Recovery on the Oils Northen Caspian
Authors M.A. Lobusev, A.V. Bochkarev, A.M. Klokov and A.A. RepnikSummaryThe different geological reserves of oilfields in the Mesozoic deposits of the Northern Caspian were formed due to hydrocarbons of completely or partially destroyed oil reservoirs in the subsalt coal-bearing reefgenic structures of the Primorsky Arch. Proceeding from this, it is suggested that genetically related hydrocarbons in reefogenic buildings be injected into Jurassic-Cretaceous deposits in order to increase the ORI of deposits. As a model polygon, considered the 7th block of a large oil field Northern Buzachi.
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Investigation of Coefficient of Linear Thermal Expansion of Bazhenov Formation Rocks
Authors A.V. Gabova, E.M. Chekhonin, E.Y. Popov, E.G. Savelev, Y.A. Popov, E.V. Kozlova and I.A. KarpovSummaryDespite the importance of experimental data on coefficient of linear thermal expansion (CLTE) for geomechanical study of the Bazhenov formation (BF) rocks the literature on such data is practically absent. Differential CLTE values of BF rock samples and their variations within wide temperature intervals were determined including the degree of CLTE anisotropy with the equipment specially adapted for CLTE measurements on standard core samples. It was established that the values of CLTE of BF rocks exceed significantly (by hundreds percent) the typical values of CLTE of sedimentary rocks. It was shown that the CLTE of BF rocks has high degree of anisotropy and irregular behavior at elevated temperatures (up to 300°C), that can be related to different values of total organic carbon in BF rock samples. For the same series of rock samples thermal conductivity, that is sensitive indicator of changes in rock condition, was measured before and after heating the samples. Results showed that thermal conductivity of rock samples did not change after heating. It was established that the directions of main thermal conductivity and CLTE axes coincide practically.
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Atlas of the Multiphysical Models of Westen Siberia Reservoir
Authors G.V. Nesterova, I.N. Yeltsov, A.Y. Sobolev and I.V. SurodinaSummaryATLAS is the collection of multiphysical models of the typical reservoirs of Western Siberia. Both geomechanical, hydrodynamic, geoelectric processes in the vicinity of the borehole and electrical and electromagnetic well logs are jointly analyzed. The influence of each of the hydrophysical and geomechanical parameters on the process of mud filtrate invasion into the formation, evolution of the electrical resistivity distribution in the borehole environment, the electric and electromagnetic logs can be studied and visualised by using ATLAS.
Further development of ATLAS is aimed to creating interpreting system of the well geophysical and geological-technological studies on the basis of multiphysical reservoir models.
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Clarification of the Correlation and Conditions for the Formation of the Famenian Deposits of the Bashkir Arch Taking into Account Lithologic Types and New Well Data
Authors G.F. Baiburina and A.R. KudayarovaSummaryThe aim of the work was clarification of the correlation, analyse of the formation conditions and lithologic typification of the Famenian deposits of the Bashkir arch for the creation of petrophysical sediment model. The development of the Kamsko-Kinelskaya trough system predetermined the formation of 2 facies zones at the north of the Republic of Bashkortostan-shelf and onboard.
The correlation constructions were based on the geophysical data of exploratory and production wells that opened the investigated section. The boundaries of the substages of the Famenian deposits were traced according to the consolidated geological and geophysical sections adopted in the calculation of the reserves. The results of the correlation constructions are isochore maps for each substage.
Using data of wells with high core removal and microscopic description of sections the structural-lithological typification of the carbonate deposits of the Famenian layer was carried out.
According to the typification, 11 lithotypes are distinguished, which in turn are grouped into 4 main groups of rocks.
More differentiated thickness maps for each substage reflecting the facies zoning can be used to solve geological exploration problems. In turn, the additional criterion that confirms the selected facies zones, taking into account the correlation, is structural lithological typification
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Regional and Local Estimate of Hydrocarbon Potential of Shale Formation Arctic Sector West and East Siberia
Authors M.A. Lobusev, A.V. Bochkarev, A.M. Klokov and A.A. RepnikSummaryThe paper discusses the most important results of the generalization of studies of the Bazhenov complex of sediments in the unexplored areas of the Arctic sector of Western and Eastern Siberia for a comprehensive solution of the entire set of questions of the formation and development of hard to reach hydrocarbons deposits from bituminous shales.
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Elaboration of Lithofacies Characteristic of Terrigenous Deposits of Devonian in the Platform Area of the Republic of Bashkortostan
Authors A.A. Gubaydullina, A.S. Dushin and R.F. SharipovSummaryThe tasks of the research included detailed description of the core with further distinguishing of lithotypes, examination of geological aspects, generation of lithologic and facies maps. In the work the facies model of Devonian terrigenous stratum isformed; the model was obtained based on description of the core of 30 wells, analyses of 423 thin sections and granulometry data of 440 samples. The basis to distinguish lithotypes is layer-by-layer description of rocks according to lithological composition and fraction size as per granulometry, as well as peculiar textural features.In the result of performed analysis of the deposit core of Devonian terrigenous stratum there are 14 lithotypes, which served as a basis for transition to deposition environment and further distinguishing of facies. To specify depositional conditions regional data were used, according to which deposition of sediments in the period of formation of Devonian terrigenous stratum took place in conditions of shallow sea.According to comprehensive study data of the core and geophysical well logging, in the sections of the key-wells relevant facies were distinguished and facies inhomogeneity maps were generated (from the point of view of cyclic structure of horizons).
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Geonavigation Using Petroinfotech Prosystem Software Is One of the Main Methods of Successfully Directing Directional Wells on the Shelf of the Caspian Sea
Authors I. Khaliullov, A. Alekseev and A. ShtunSummaryOil and Gas Condensate Field. V. Filanovsky is located in the northern part of the water area of the Caspian Sea. The deposit is confined to the anticlinal uplift, characterized by a series of burst faults of fault type. The initial geological model of the deposit is based on the interpretation of 3D seismic data and GIS data in 3 reference wells. The accuracy of the position of the roof of the target productive horizon in the planning of the first horizontal well was estimated at +/- 20 m vertically, according to the structural constructs. Accumulated in OOO LUKOIL-Nizhnevolzhskneft drilling experience with the use of an integrated approach to the analysis of geological and geophysical information and decision making allows successful successful entry of complex horizontal wells. Implementation of these tasks requires an easy-to-use and mastering software covering all aspects of the planning of trajectories, posting and analysis of the results of horizontal drilling of trunks. An example of the use of PetroInfoTech ProSystem software with the posting of a doublebarrel horizontal well at the deposit is presented. V. Filanovsky.
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TEM and sTEM Electromagnetic Studies Application in Geological Settings of Arctic Zone of Western Siberia
SummaryThe article describes results of electromagnetic TEM and sTEM exploration in the settings of the Arctic zone of Western Siberia. The research consisted of a separate study of the upper and the lower parts of the section, which made it possible to obtain a detailed geoelectric model in the depth interval from the first meters to 5 km.
As a result of the research, the latest data on the distribution and thickness of permafrost rocks, deep channels of hydrocarbon migration, and prospects for the oil and gas potential of the study area were obtained.
The boundary of the cryolithozone distribution according to the sTEM is presumably located at a depth of about 450 – 470 m. In addition, for the first time, according to the data of the sTEM, the prerequisites for the presence of gas hydrate deposits in the shallow section are revealed. According to EM data, the geoelectric structure of the sedimentary rocks to a depth of 5 km was estimated by the method of deep 3D TEM, and promising oil and gas bearing objects in the sedimentary cover of the study area were identified.
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Productivity Parameters Prediction on Maps Using Neural Networks
Authors S.V. Egorov, I.I. Priezzhev, A.E. Schelkunov and E.A. GladkovSummaryThe presentation shows the technique and examples for predicting the oil and gas productivity parameters on the map on the basis of a deep neural network with hybrid training and Tikhonov regularization. The results of predicting the effective thickness in continental facies of Western Siberia are shown. The results of comparison between prediction maps obtained by the neural network technique and multidimensional regression are also shown. The advantages of a neural network are efficiency, higher resolution and better correlation coefficient with well data.
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First Experience of Geomechanics Modeling Using Transversely Isotropic Model, East Siberia
Authors A.A. Zinovyev, V.A. Pavlov, D.A. Maximov, E.P. Korelskiy, S.G. Strakhov, A.A. Eremeev and M.A. LushevSummaryIt is shown that Vendian terrigenous deposits are characterized by anisotropic mechanical properties. Transversely isotropic model with vertical axis of symmetry (TIV) was used for geomechanics model construction of one of the largest field in East Siberia.
In this paper an algorithm and main aspects of geomechanical modeling with respect to anisotropy of the rock mechanical properties are presented on example of particular field. The impact of anisotropy on results of geomechanical modeling is demonstrated, justifying the need to take into consideration anisotropic effects.
It is shown that anisotropy of rock mechanical properties has to be taken into account for more accurate results of different studies such as avoiding instabilities while drilling, hydraulic fracturing treatment design etc.
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DFN Modelling and Upscaling of the Naturally Fractured Field
Authors P.A. Kharitontseva, V.S. Rukavishnikov and S. GeigerSummaryThe work starts from the analysis of the literature data of the Teapot Dome field in order to determine the fracture mechanisms induced the fracturing. The Cooper and Lorenz, 2011 , theory was used as a basis of major fracture dips and azimuth. For the theory proving, the analysis of well with formation microimager (FMI), 48-x-28, was done. This well confirms the theory and the data from previous research (B.C Schwartz) can be used for discrete fracture model construction. As the major STOIIP is included in the matrix, the global geo-cellular matrix model was constructed first Then the several 3D grid sizes were created and the matrix properties were upscaled into the grids. For each grid size model the same discrete fracture model was constructed. The obtained fracture network parameters were upscaled into each grid by means of two methods Oda and Oda gold.
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A Complex of Geological and Geophysical Methods for Determining the Spatial Position of Zones with Different Filtration Properties in Limestones of the Khalah Formation
Authors A.G. Kobzev, S.A. Pereverzeva, T.A. Berdichevskaya, N.A. Vaskova and A.E. OvinnikovSummaryThe studied porous-cavernous carbonate rocks of the Khalah formation of the North-Western desert of Egypt are represented mainly by cavernous limestones, in the lower part of fine-grained chalky and marly limestones. Throughout the work area, limestones are blocked by younger sandstone calcareous with stratigraphic disagreement. In the roof of limestones, the weathering crust is represented by sections of scabrous rocks with loamy aggregate of 1 to 3 m in thickness. In the present study, two problems were solved:
- Study of the pore space of limestones of the Khalah formation
- The positions in the space of the zones of these rocks with different physical properties, characterizing permeability.
The solution of these problems is connected with the subsequent construction of industrial facilities in the territory under consideration. To solve these problems, a set of geological and geophysical methods was applied.
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Mathematical and Physical Simulation of Responses of An Electromagnetic Logging Tool for Studying Macroanizotropy of Sedimentary Deposits
Authors M.I. Epov, V.N. Glinskikh, V.N. Eremin, M.N. Nikitenko, A.N. Petrov, I.V. Surodina and I.V. MikhaylovSummaryThe presented work is devoted to development of an electromagnetic tool designed to study electrophysical parameters of sedimentary rocks characterized by macroanisotropic properties. Based on new theoretical and engineering ideas, we have proposed, designed and developed an electromagnetic tool with a high spatial resolution. We have developed complexes of algorithms and computer programs for the analysis of the new electromagnetic logging tool signals in spatially inhomogeneous media. The measured electromagnetic signals and their sensitivity functions to electrophysical parameters of the models are studied. With respect to processing and interpretation of the electromagnetic tool data, we have developed algorithms for filtering, transforming signals into apparent parameters, detecting formation boundaries, and numerical inversion aimed at the determination of the parameters of an isotropic and anisotropic formation, taking into consideration the host medium. We provide examples of the test results obtained in a metrological tank with electrolyte, as well as in natural and artificial freshwater reservoirs. A prototype of the electromagnetic tool was designed and created, with further testing of the prototype and its main components on laboratory test facilities and in conditions close to those in boreholes.
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The Forecast of Collectors of Deposits of D3 and P1 of a Northeast Part of the Horeyversky Depression by Results of the Seismofacial Analysis
By I. SverdievSummaryIn the study area North-East Khoreyverskaya basin reef development is confined to the domaniksyracusecoe and escelsa-sakmarian interval of the section. In the system of reefs are barrier reefs, and isometric buildings. In addition, escelsa-sakmarian interval allocated to a specific education - reef structures, extensive in area, but not related to barrier systems, separating different lithological-facies zone, named “ribbon” reefs and extensive shallow area is almost continuous development of reefs and associated facies. Seismic facies analysis was carried out within Passedskaya field. At the Deposit and adjacent areas are deposits, and identified numerous oil slicks in the lower Devonian, upper Devonian and lower Permian sediments. Forecast manifolds made with the help of seismic facies analysis based on seismic data. The study was performed by visual analysis of the shape of seismoscopes, using maps of the thicknesses between the maps of seismic attributes and classification analysis.
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N-Component Source Rock Kinetics in Oil and Gas Exploration in Russia
More LessSummarySome new kinetics from Russian well-known source rocks are provided in paper. The results of appliance of kinetics in petroleum system models in Tatar basin and West-Kuban basin are shown.
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Development of Cloud Computing Software for LWD Measurements and Geosteering
Authors A.R. Dudaev, A.Y. Sobolev and V.N. GlinskikhSummaryWe have developed a prototype of cloud computing software for logging-while-drilling and geosteering. For the first time ever, during the development of software for addressing the problems of petroleum geophysics, we apply software solutions based on state-of-the-art IT-technologies in the field of cloud computing, namely, cross-platform scalable distributed computing. We have created a client-server application written in JavaScript, which stores all user data in MongoDB. The application allows a user to send input data through message queues for processing by means of computing applications that run in a virtual environment. Processing results are displayed on a web page. We have tested the software under discussion on real practical data from the interval of a subhorizontal well from one of the Latitude Priob oil fields. When drilling highly deviated boreholes, an effective well targeting in the productive part of a reservoir is essential. Successful Russian experience of studying oil and gas wells is demonstrated by using the first Russian telemetry system for logging-while-drilling, intended for drilling wells with horizontal completions. At the present time, it is necessary to develop a multifunctional automated computer system for processing, visualization and interpretation of the data obtained with the complex under consideration.
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Development of Fractured Zones of Khadum Suite Deposits in East Caucasian Region
Authors A.S. Rakhmatullina, A. Postnikov, L. Miloserdova, O. Sivalneva, A. Musikhin, Y. Varov and I. SabirovSummaryThe Pre-Caucasian Oil and Gas Province is one of the oldest provinces in Russia, the main hydrocarbon reserves are associated with the Meso-Cenozoic sedimentary complex. Unlike the Mesozoic sedimentary complex, which is mainly represented by fractured-porous and porous reservoirs in terrigenous and carbonate rocks, the prospects of the Cenozoic sedimentary complex are associated with clayey porousfractured Paleogene reservoirs, including reservoirs in the deposits of the Khadum suite of the Early Paleogene.
Since the fractured component has a key role in the structure of the reservoir and in the filtration of fluids, it is necessary to develop a technique for developing of decompaction zones which are perspective to have a fractured reservoirs in the deposits of the Khadum suite, based on the complex of geological, geophysical and remote methods.
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Electrophysical, Hydrophysical and Geomechanical Characteristics of the Jurassic Oil Collector on Electric Well Logs
Authors D. Pavlova and I. YeltsovSummaryCoupled geomechanic and fluid flow analysis is applied to reduce ambiguity of the solution of the inverse problem and to increase reliability of oil reservoir parameters definition. Interpretation of the oil well electrics data on the basis of geophysical and hydrodynamic compatibility model was carried out with materials from the Russkinsky and the Tevlinsko-Russkinsky oil fields of Western Siberia. The object of research is the Jurassic oil collector which has a complex structure of penetration zone. Input parameters of joint model were determined from data of geophysical study of borehole and core analysis.
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Development of a Criteria Set for Estimation the Quality of Fluid Seals in the Deposits of the Famennian-Turney Carbonate Sequence in the Orenburg Region on the Basis of Core and Log Data
Authors N.N. Chikina, Y.I. Nikitin, E.V. Astafev and A.P. VilesovSummaryThe Upper Devonian reefs are one of the main factors of oil accumulations within the Orenburg region. Development of seals in the structures of differential compaction over the Upper-Fransian single basin reefs is not well studied and associated with the main prospects for discovering and involving production of new oil reserves. Identification of true and false carbonate seals by core and log data is based on the techniques and criteria, which lead to targeted search of unexplored oil reserves in the Famennian reservoirs not only in the already discovered Carboniferous deposits, but also in evaluating the prospects for newly acquired licensed areas.
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Formation Conditions of Carbonate Reservoirs in offshore of the Middle Caspian Petroleum Basin
Authors A. Maksiutova, A. Aseev and A. BlankSummaryMesozoic deposits in the Middle Caspian Sea have interested petroleum companies during long time with rich hydrocarbon potential, but they remain insufficiently studied for deep understanding of geological structure exist deposits and perspective objects.
The Upper Jurassic carbonate reservoirs, whose productivity is mainly associated with the secondary porosity, is an intricate object of study at one of the Karpinsko-Mangyshlak deposits. The complexity of the formation condition reconstruction of carbonate reservoirs is due to the large number of geological factors affecting the formation of the original void space, from which formation of the secondary porosity in future depends.
Sedimentation analysis of the Upper Jurassic carbonate reservoirs distribution in offshore of the Middle Caspian petroleum basin represented their confinement to the shallow inner ramp facies (lagoon and sandbanks) and the mid ramp facies.
In such in manner, with the knowledge of the geological structure of the area, using a technique of separate core data by lithotypes, well loging and FMI data, by combining them with using a map of attributes extracted from the acoustic impedance cube, a facial map can be constructed to better orientate the geological development of the area and the predict of productive zones.
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Classification of Hydrocarbons. the Results of the First Year of Implementation
Authors R.M. Kuramshin, A.V. Osipov and S.G. SerovSummaryRosnedra has formed a new algorithm (order FAN No. 455) in 2016 and a special Commission of the Federal subsoil resources management Agency for approval conducted by the State expertise (SE). FBU GKZ has developed and implemented a new scheme for the selection of experts and conducting SE.
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Features of Magnetotelluric Transfer Functions for the Central Part of East European Platform
By S. RiabovaSummaryMagnetotelluric transfer functions are in demand not only in researching of the Earth’s crust geoelectric structure, including in the allocation of the increased fracturing zone, and are also involved in monitoring seismotectonic processes in the lithosphere, establishing effects accompanying earthquakes and searching for possible ore occurrences and oil-gas-saturated deposits. In this work we present an analysis of magnetotelluric transfer functions for the mid-latitude conditions of the East European Platform. The analysis was carried out with the use of instrumental observations made at Geophysical observatory Mikhnevo and Geophysical observatory Borok from 2010 to 2013. The robust method of signal-to-noise separation was used as an evaluation of magnetotelluric transfer functions, which makes it possible to suppress noise of various types. As a result of the analysis of data from observatories Mikhnevo and Borok, the annual periodicity of the variations of the magnetic tipper and the magnetic tensor is established. In the magnetic tensor, annual variations are more pronounced in the variations of the phases of the main components, and in the magnetic tipper variations, along with the annual periodicity, there also are variations with a sixmonth periodicity and with a period of 60 days.
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Efficiency of Application of Geostatistical Inversion at Specification of a Structure of Oil-And-Gas Layers of the Jurassic Complex
Authors A.V. Shaykhlislamova, S.V. Gurina and T.R. SharafutdinovSummaryAs a matter of experience performance of seismic inversions for various geological tasks it is possible to draw a conclusion that the choice between deterministic and geostatistical methods needs to be made, proceeding from the set of geological objects and degree of study of the field. At an initial stage of development of the field it is enough to perform integrated forecast for deterministic inversion allowing to reveal zones of development of reservoirs with improved properties. In case it is necessary to specify a deposits structure during creation of geological model, planning of development drilling, in particular for a difficultly constructed and strongly changing on lateral reservoirs, it is necessary to use a method of geostatistical inversion. Possibilities of more objective forecast of petrophysical parameters of sandy reservoirs are extending, because of use of seismic data inversion in a complex with a structural factor, petrophysical modelling data, on the basis of knowledge of formation and a structure of oil-and-gas complexes of the region.
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Oil and Gas Content Analysis of the Tectonic Blocks of the Srednemessoyakhsky Shaft
Authors E.A. Potapova, L.A. Dubrovina and Y.V. LoshachenkoSummaryThere are more than one hundred reservoirs discovered within the Srednemessoyakhsky shaft and the great majority of them are tectonically screened. Due to uneven distribution of the oil and gas reservoirs over the tectonic blocks this work presents the prospectivity estimation of the undrilled tectonic blocks based on both definition and analysis of main productivity criteria for any blocks.
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Geological Chance of Success Estimation for Appraisal Objects in Western Siberia
Authors A.S. Meshcheryakova, M.G. Dymochkina and D.A. KotunovSummaryAs known, planning geological prospecting works occurs under conditions of high uncertainty, i.e. lack and inaccuracy of information about the object of research. Concerning, the geological exploration process is very risky, and it is necessary to estimate risks and systematically manage them.
A systematic approach to the geological risks analysis and their permanent analysis is important for increasing efficiency of the exploration program and improves economic performance.
The main tool for geological risk estimation is the geological coefficient of success (gCoS). As the result of world experience analysis in our company, the methodology estimation of geological coefficient of success designed. However, for a correct assessment is required to collect gCoS statistics for different evaluation objects and compare it with the actual results.
In order to approbate the assessment methodology and to calibrate it, an evaluation of exploration and prospecting drilling objects for the coming years ware made. After comparison of the current assessment and results, it will be possible to optimize our approaches to estimating the geological coefficient of success.
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Prospects of the Construction Regional Seismic 3D Cubes with Data of 2D Seismic Exploration
Authors A.Z. Nedostupov, T.R. Sharafutdinov and I.A. MushinSummaryAt the level of the modern study of the Russian Federation by seismic exploration there are still gigantic poorly studied territories such as Taimyr which still remains the least explored region of Russia in regard to geology. Solving the problems of zoning with traditional methods requires huge financial investments and, along with this, considerable time. Solving the problems of zoning with traditional methods requires huge financial investments and, along with this, considerable time. Therefore, innovative technologies, which help to reduce the time and economic costs for solving these problems, acquire special relevance recently.
After heterogeneous priori G&G data are converted to a predicted 3D seismic wave field we have succeeded to discover vast opportunities to identify and oil-and-gas bearing features both earlier known in oil and gasbearing area and new which have been not revealed and researched yet.
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Prospective Hc-Bearing Objects in Western Part of Yenisei-Khatanga Regional Through
By S. KarpukhinSummaryComplex interpretation for the Yenisei-Khatanga regional trough was conducted using the latest available well and 2D-seismic data. As a result of work more than 20 HC traps, falling into 3 categories (structural, structural-depositional and purely depositional), were identified. Traps are primarily associated with neocomian complex. Most traps are found to be purely structural and associated with inherited folds. These traps are accompanied by inverted circular structures (ICS) caused by low velocity anomalies (VAMP structures). Such features are clearly visible on time and flattened-time sections. For depositional traps localisation, strong correlation was found with thr geomorphology of pre-neocomian sea floor. Thickness maps for upper jurassic sediments were compiled to assist in delineating such depositional traps. Areal extent of tectonic-depositional traps appeared to be constrained by the northern part of the through. These traps are structural ones, but their closure in northern direction, which is critical due to the regional raising trend, is formed by the dipping clinororm beds.
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Structural and Geomorphological Analysis of the Latitudinal Ob in Western Siberia and Relationship with Petroleum Potential
Authors E.A. Manuilova, L.V. Panina, V.A. Zaytsev and G.A. KalmykovSummaryBased on the structural-geomorphological analysis of the the Latitude Ob territory young, active structures, which had been orographically expressed in the modern relief have been established. Regional structures that represent a combination of lifted blocks separated by narrow depressions were identified. Weak zones were established, mainly in the north-western and north-eastern directions. The shift faults (left- and right-handed) are identified, the combination of which demonstrates the conditions of submeridional compression. Interpretation of geomorphological and seismic profiles allow to reclassify some weak zones into discontinuous violations. Correlation of surface and deep dislocations was carried out. Some of the newest structures have partially inherit the ancient structure plan. It has been established that oil and gas fields are attracted to the latest achievements, zones of new shift faults, sub-regionally oriented weak zones and tears.
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Developing a Unique Size 3D Geomechanics Model - Features and Advantages. East Siberia
Authors M. Lushev, E. Tryasin, D. Maximov, S. Kreknin, V. Pavlov, S. Strakhov, E. Korelskiy and A. ZinovievSummaryIn the context of developing the unique three-dimensional geomechanical model shows a number of a new technical solutions under conditions of extremely large size of the modeled area, without sacrificing high detailization of model which is sufficient to solve the problems of the construction and completion of wells in areas of exploration drilling.
First time in the world realized the development of a unique scale three-dimensional geomechanical model covering the entire contour of the field - 20,000 km2. The main stages of model development was reviewed based on the technical and geological characteristics of the modeled area to offer a unique solution. Analyzed the applicability of new technical solutions on the example of a particular field.
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Structural Features and Petrophysics of Low-Resistance Reservoirs of the Western Siberia Vatjegansky Upper Jurassic Oilfield
Authors V. Terentyev, T. Dyakonova, A. Komova and L. BataSummaryIn this paper, the features of low-resistance reservoirs of the Vasyagan series of Western Siberia Vatjegan oilfield are observed along with possible reasons of rock resistivity decrease. As a result of intensive core samples research a conslusion is made that the main influence on a rock resestivity decrease of the Vatjegan oilfield UV1 layer is done by fractional composition of sediments. An algorithm was developed to divide UV1 reservoir layers by lithotypes based on GIS data which corresponds to the traditional and lowresistance parts of the cut. The problem of estimating the oil saturation coefficient is considered, a technique is proposed for evaluating the character of the reservoir saturation of the investigated sediments, depending on their filtration capacity.
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Automated Thermal History Reconstruction of Basin in West Siberia Using 2D Inverse Modeling
SummaryUnderstanding thermal and structural evolution of sedimentary basin is a key to assessing the hydrocarbon prospect. In the common approach to reconstruction of this evolution, a priori knowledge of thinning factors and paleobathymetry is required (while necessary data is commonly not available), sub-basin crust and mantle lithosphere evolution is omitted, and information about basal heat flow (it is usually getting from published heat flow maps, while this data is highly unreliable) is used as a boundary condition. Automatic correction of the prescribed heat flow is performed to get a good matching of modeling results with measured present-day temperature and maturity indicators. As a result, the approach gives multiple solutions and leads to fluctuations in temperature and maturity without proper physical/geological justification. There is an alternative approach to thermal reconstruction, resolving simultaneously for lithosphere and sedimentary basin processes. It involves an inverse algorithm, which iteratively updates crustal- and mantle-thinning factors and paleowater depth until the input stratigraphy is fitted to desired accuracy. The potential of this approach is demonstrated through comprehensive study of a transect across the West Siberian basin. Different geological scenario was considered, parametric study on key parameters was done, and the thermal blanketing effect of sediments was demonstrated.
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The Approach to Parametric Multidimensional Inversion of Marine Electrical Prospecting Data Considering Bathymetry
Authors M.G. Persova, Y.G. Soloveichik, D.V. Vagin, D.S. Kiselev, Y.I. Koshkina and D.N. KurskiyaSummaryThis paper proposes the approach to multidimensional inversion of the marine electrical prospecting data in the time-domain, which are obtained using the Differential Normalized Method of Electrical Investigation (DNME). This approach is based on the parametric (model-based) nonlinear multidimensional inversion with the simultaneous recovery of the borders coordinates of the 3D inhomogeneities and their electrophysical properties (electrical conductivity and polarizability). The solution of forward problems and calculation of the field of the impact of geoelectrical model parameters are performed with the use of the finite element method. The inversion is carried out in two stages including the division of measured signals into the electrodynamic component and signals of the induced polarization field. The subhorizontal borders of structural parts of the geoelectrical model can be either fixed (for example, according to the sea depth variations or borders, obtained by seismic methods) or recovered. The possibilities of the proposed approach are shown with the use of synthetic data for the generalized geoelectrical model which was constructed on the basis of the results of the DNME data interpretation obtained in several sea areas.
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The Approach to Processing the Data of Induction Logging in Horizontal Wells in the Presence of the Fault
Authors M.G. Persova, Y.G. Soloveichik, Y.I. Koshkina, D.V. Vagin, D.S. Kiselev and I.I. PatrushevSummaryThis paper proposes the approach to data processing, which allows quite a fast determination of the fault location using the induction logging data obtained in horizontal wells. The proposed approach is based on the use of the 1-D inversion and inversion based on the use of 2.5-D or 3-D finite element modeling. At the first stage, we determine a zone which is characterized by the dramatic change of the geoelectrical model parameters obtained as a result of the 1-D inversion in the adjacent points on the logging tool motion trajectory. Then, in this zone, we perform the multidimensional inversion which results in determining the point of intersection of the fault line and trajectory of the tool motion. The possibilities of the proposed approach are shown with the use of synthetic data obtained by 2.5-D modeling for the geoelectrical model which is specific for the problems of induction logging in horizontal wells. We show that the location of the point of intersection of the fault line and trajectory of the tool motion is determined quite accurately, and the computational time, which is required for the multidimensional processing in a separate zone, is about a minute when we use a personal computer.
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Three-Dimensional Density Model of Enisey-Khatanga-Region
Authors I.V. Lygin, A.P. Afanasenkov, T.B. Sokolova, K.M. Kuznetsov and G.S. GrigorievSummaryYenisei-Khatanga regional trough (the borderland of the Siberian platform) is poorly studied area by seismic method. At the same time, the territory is more than 70% covered by gravity and magnetic. In this case high efficiency of integration based on the analysis and interpretation of gravity and magnetic fields is evidence.
Joint interpretation of potential fields data and seismic data has allowed to clarify the structure of seismic horizons in space between seismic lines and offer original underlying three-dimensional density and magnetic model of the earth’s crust. These models made new insight on the geological structure and geological history of the region. The key result was a volumetric reconstruction of the tectonic elements of the Yenisei-Khatanga rift system. The technique of creating three-dimensional density model and its use in geological reconstructions is in this report.
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New Geological Data for Model of Sorokin Arch Artinskian Oil Reservoir
Authors A.A. Chistyakov, A.V. Demidov and A.F. KadyrovSummaryThis article contains the evaluation of the geological influence over unpredictable and low production rate of Artin age oil reservoir situated at Sorokin Arch. The SCAL results, FMI, logging data and seismic were analyzed during current research. As the result, the new conceptual model was designed including structural and lithological features. As the consequences, the link between production rate and geological features was recognized.
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The Problems of Indexation of Productive Layers and Reflecting Horizons of the Jurassic Deposits of the North-East of Western Siberia
Authors I.N. Nizamutdinova, A.P. Zhukov and L.B. PetrykinaSummaryA brief review of the existing problems of indexation of productive layers and reflecting horizons of the Jurassic deposits in the north-east of Western Siberia is given, the necessity of creating a single stratigraphic-correlation basis for the region is considered. The authors compiled a consolidated unified stratigraphic diagram of the northern regions of Western Siberia according to a new structural and facial regionalization of the Jurassic deposits, which is based on the results of the studies carried out to solve the problems of regional mapping of oil and gas reservoirs.
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Modern Seismic Field Acquisition
More LessSummarySeismic field acquisition play a great role in receiving good materials in seismic prospecting. The latest improvements in seismic acquisition is possible to read in materials of annual geophysical conventions. We used this materials to inform our specialists about news in field technologist. It is the aim of our report. We note next directions in modern field seismic acquisition: - theoretical and experimental investigations in seismic wave generation; - development of field vibroseis equipment. We demonstrate the high geological effectiveness of modern seismic field acquisition.
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Modeling Hydrothermal Circulation During Formation of the Oil and Gas Deposits in Volcanogenic Structures
Authors A. Kiryukhin, P.O. Voronin and O.O. UsachevaSummaryTOUGH2/TOUGHREACT modeling used to reproduce possible hydrothermal circulation regimes during formation of oil volcanogenic reservoirs (Rogozhnikovsky oil rhyolite reservoir (West Siberia) and White Tiger oil granite reservoir (Vietnam)) and water-methane deposits in volcanogenic-sedimentary basins (Kshuksky (West Kamchatka) and Koryaksky-Avachinsky volcanogenic basin (East Kamchatka)). Mutnovsky hydrothermal system used as a referenced example.
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Seismic Non-Linearity in Case of Single Shot Impact. Matched Non-Linear Operator Calculation
Authors A.A. Arkhipov and V.S. TyrichevSummarySignificant non-linear effects of geological environment in seismic data are obvious in case of vibration impact. Authors described their version of non-linearity explanation in case of single shot impact. First time a method of linearization of seismic data introduced. Method allows noticeably rise correlativity between linear-modelled data and conventional seismic.
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Development of the Approach for Automatic Well Logging Interpretation for Big Number of Wells with the Use of Machine Learning
Authors M.F. Validov, A.R. Ismagilov, D.S. Voloskov, M.S. Magdeev and A.A. NazarovSummaryThe increased interest for geological and reservoir simulation model construction for the old fields raises the issue of reinterpretation of well logging data of the old well stock, taking into account the concepts of geology, specified during the period of field production. This work shows the results of mathematical approach development for automatic interpretation of well logging data of the old well stock. The work is aimed to solve the problem of fast reinterpretation of a standard logging set using machine learning algorithms. The solutions obtained for the determination of stratigraphic boundaries with the use of logistic regression and the detection of lithotypes basing on the support vector machine are presented. Mathematical algorithms and approaches to use them are presented and described.
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Modeling of Three-Dimensional Magnetotelluric Fields by Vector Finite Element Method Using GPU
Authors P.A. Domnikov and N.V. KondratyevSummaryThree-dimensional modeling of magnetotelluric fields using the vector finite element method is carried out. We use the vector differential equation for the single vector-potential and the system of vector-scalar equations for the coupled vector and scalar potentials. We use the edge-based vector basis functions for the vector potential and nodal basis functions for the scalar potential. We use the COCR solver for the solution of the large sparse system of linear equations with Jacobi and folded preconditioner. The CPU and GPU implementations of the developed methods are compared. We test our methods on complex realistic problem of three-dimensional magnetotelluric sounding providing in Russian Far East. The conducted experiments show the advantage of GPU using.
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Wave Modes Study for Acoustic VTI Equations
Authors D.I. Sabitov, M. Charara, Y.A. Nikonenko and A.A. DotsenkoSummaryThe application of reverse-time migration (RTM) on a large scale has become affordable and has led to significant advances in seismic depth imaging in complex areas, especially for sub-salt imaging. For imaging in anisotropic media with vertically transverse isotropy (VTI), RTM is usually based on an acoustic VTI approximation of the elastic wave equation by setting the vertical shear-wave velocity to zero. However, these equations generate artificial pseudo shear-waves that spoil any seismic imaging process. By studying the wave modes associated to that equation, we identify that a second mode exists for the anelliptic case, i.e., when the Thomsen parameters ∈ is different from δ. This mode generates the spurious pseudo shearwaves. We show that as long as the simulation of the P-wave propagation is consistent with the usual marine seismic wavelengths, the spurious pseudo-shear wave is not generated or very weak compared to the P-wave mode. We illustrate this fact, for the case of a homogeneous medium modelling and for the more realistic case of a 2D Salt body modelling.
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Special Aspects of Complex Reservoirs Interpretation on the Example of Pannonian Basin
Authors E.F. Tcukanova, K.A. Ezhov and E.S. MileiSummaryThe main objectives of this work is to prepare complex petrophysical and geological model for complex reservoirs: heterogeneous sandstones-conglomerates and naturally fractured metamorphic basement. Each case is very actual not only for local experience but for the global understanding: number of objects with the complexity is increasing, that means the time of pure and clear sandstones has passed. We need to develop and use new approaches, based on more advanced tools and interpretation techniques.
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Curvilinear Spectral Elements Application for Sonic Logging Forward Modeling
Authors D.I. Sabitov, M. Charara and A.A. DotsenkoSummaryThe interpretation of sonic well logging data is a challenging problem for researches in the oil industry. A fast and accurate numerical method is needed to get the cleat picture of the physics of wave propagation in complex geological surroundings with the presence of strong discontinuity of fluid-solid interface. The Spectral Element modeling allows to solve efficiently the 3D dynamic wave propagation problems with complex physics. For sonic logging problems together with appropriate choice of spatial mesh step size the correct approximation of borehole geometry affects the accuracy of the numerical solution. The goal of this work is to extend the spectral element method to deal with the curvilinear elements and to show its addition value for the mesh construction, approximation of the geometry and increasing the accuracy of numerical solutions.
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Integrated Technology of Planning and Geological Support of Well Drilling
Authors M.V. Ovcharenko, A.N. Lanin and I.V. EvdokimovSummaryWell planning, support of well drilling, geological modeling, hydrodynamic modeling
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A New Approach to the Analysis of Gas Anomalies in the Subsoil Geosphere for Oil and Gas Exploration
Authors O.K. Navrotsky, A.N. Zotov and A.M. DotsenkoSummaryFor oil companies operating in relatively small license areas, it is quite difficult to take advantage of all the scientific methods for solving their problems in terms of scientific, organizational, financial positions. In this paper, the authors share the experience of integrating structural geomorphological studies and gas surveying that led to the discovery of an oil field in the northwestern part of the Caspian depression
The results of the work allowed us to formulate a new principle for interpretation of gas-geochemical testing of local objects in the forecast of oil and gas potential: areas that are characterized by a minimal hydrocarbon geochemical background and minimal tectonic tension are promising in the oil and gas respect. Special gas-geochemical (during August-December) studies at the open field showed that hydrogen does not exist in its subsoil gas.
Obviously, we need to make some clarification - the noted regularity is characteristic for territories with a direct character of the relief. In this case, the correlation of the structural plan of the deposits of the Bobrikovsky age in which the hydrocarbon depositsare detected and the relief is confirmed by high values of the correlation coefficient (0.7).
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Geological Characterization of Continental Deposits in Case of Heterogeneously Saturated Reservoir
Authors M.I. Lezhnina and A.O. VaysmanSummaryThere were made prediction of the lateral distribution of facies zones in the interval of PK1-3. It has been established that for facial “A” and “C” cyclites can not be separated by facial zoning. At the same time, in facie “B” the boundaries are delineated, within which delta channels extended to varying degrees of extent, connected in area and section, associated with belts of meandering delta channels. Based on the interpretation of the logging data, as well as intermittent sampling of the MDT samples, it was possible to distinguish the zones depending on the saturation: the hydrodynamic inconnectivity of the cyclite A with the underlying sediments in the central part of the deposit. There were established that the OWC level is controlled by a structural factor, it is hypothesized that the reservoir PK 1-3 is “insufficiently formed”
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Conceptual Geological Modeling of Achimov Layers in Terms of Severo-Samburgskoye Field
Authors D.O. Mishina and K.A. BogdanovaSummaryThis work includes investigation of all information and from this creation of two different geological scenarios for achimov layer of Severo-Samburgskoye field, that take into account all field uncertainty. First of all it includes inspection of core and detection of facies with typical reservoir characteristics. Than core information is transferred into well without core recovery using well survey data. Also we performed seismic interpretation and choose such attribute that allow to contour facies distribution on space. After that we distinguish well test results and recognize that they illustrate different results, so decision was taken to create two different geological scenarios,. First of which includes one united reservoir with assumption that results of well test are incorrect, the second variant of geological scenarios includes three reservoirs that disconnected with each other and have it their own oil water contact. Than we estimates optimal development strategy for each variants and understand that for further decisions it Is necessary to implement additional exploration program which allow to reduce risks and as consequence to increase economic efficiency.
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The Layer-Based Approach for Hybrid Parameterization of Model. Tomography in the Conformally Layered Model
By R. AnisimovSummaryIt will be presented generalized layer-based model and conformally layered parameterization of stratum which is a layered analogue of stratigraphical mesh. Also nonlinear tomography will be discussed which is using for determination parameters of such model type.
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Forecast the Zones of Development of Crust of Weathering by the Scattered Component of the Wave Field
Authors E.V. Anokhina, M.N. Nazarova, G.N. Erokhin and L.F. ZhegalinaSummaryA characteristic feature of deposits in the weathering crusts is the presence of cracks. To effectively identify such zones, the scattered component of the wave field is used. Specific examples show the mapping of the productive zones of the weathering crust in the field of scattered waves.
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Geological Model of Novoportovskoe Field for Geosteering
Authors A.V. Karnaukhov, D.O. Mishina, D.A. Reshetnikov and L.R. SamigullinSummaryNovoportovskoye field is one of the most perspective object of the Company, which contains high oil reserves. In 2015 has been started full-scale drilling on main production targets – NP2-3, NP4, NP5, J2-6. On line navigation requires geological model that has good ability of prediction and shouldn’t change in zones situated far from drilling region. Geological modelling performed in Shlumberger Petrel 15.4. Five algorithms were examined. Suggesting algorithm is using Truncated Gaussian Simulation with 3d trends made with Trend Modelling. Suggesting algorithm provides better ability of prediction and makes geological model more sustainable.
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Forecast of Fracture and Cavernous Reservoirs of the North-Barents Shelf by Scattered Waves
Authors L.F. Zhegalina, G.N. Erokhin, E.V. Anokhina and M.N. NazarovaSummaryThe results of a complex interpretation of the reflected and scattered wave fields are presented to refine the fault-block model and fracture and cavernous reservoirs forecasting of both tectonic and lithogenetic origin. The forecast is based on the original pre-stack migration method - Common Scattering Point Dip (CSPD).
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Justification of Procedures for Differentiation of Siliciclastic Reservoirs by Their Flow Properties (A Case Study from Devonian Sandstones of the Republic of Bashkortostan)
Authors A.M. Khusainova, T.V. Burikova, A.A. Gubaydullina, O.R. Privalova and R.V. AkhmetzyanovSummaryThe objective of the research is a reference framework set of petrophysical data characterizing the Devonian siliciclastic sediments of the study area. The characterization workflow includes three main stages: the first is the lithological typification from core description, the second is matching of the identified lithotypes with their petrophysical properties and the third is testing the model against wireline logging data.
The core from selected wells was described for lithological typification and studied with routine and special core analysis procedures in the laboratory. It is well known that shale content changes the physical properties of the rock, hence the results of the particle size distribution analysis were used to group the samples into classes based on the grain size subject to the ratio of clay material in the rock fabric. The normal trend is observed for increase in shale content with smaller grain size.
Based on the lithological description all the samples were grouped into three petrophysical classes then characterized by their own petrophysical relations and constants. This approach is based on the fact that the shave volume as opposed to grain size can be estimated from well logs and then applied to reservoir characterization and differentiation.
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Geological Structure and Prospects of Oil and Gas Content of Late Baios- Callovian Deposits in the Western Part of the Yenisei-Khatanga Regional Trough
By D.S. LezhninSummaryIn the present work, an example of one of the regions located in the junction zone of the West Siberian plate and the Yenisei-Khatanga regional trough has been considered, methodological methods for identifying and mapping reservoirs in the Middle Jurassic sediments are considered. The research was carried out on the basis of the integration of seismic data, GIS and the results of petrophysical studies of core material. As the actual material, temporary seismic sections of 2D in the volume of 2988 running meters were used. Km and drilling and GIS data for 49 deep wells.
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Problem-To-Solution Approach to Characterization and Differentiation of Pore Types in Carbonate Reservoirs
SummaryThe paper reviews the problems of differentiation of reservoirs with mixed types of voids including fractures, vugs and moldic pores for heterogeneous Lower Devonian and Upper Silurian carbonates of R. Trebsa oilfield (NAO) and Tournaisian-Frasnian carbonates of Tabynskoe oilfield (Bashkortostan) using core, wireline logs and production tests.
The algorithms are presented to obtain additional information on textural features of the reservoir facies from integration of core data with results of extended logging suite. The study results in the reservoir flow model based on the ratio of connected pores, secondary voids, clay content by volume and to a greater extent relative shaliness. Matching of permeabilities measured on samples in the laboratory both on whole-sized core and plugs to permeabilities estimated from well logs and flow tests revealed their different combinations in high-productivity and low-productivity wells producing from complex carbonates ranging in age from Upper Silurian to Lower Devonian on R. Trebsa oilfield and Upper Devonian to Lower Carboniferous on Tabynskoe oilfield. The integrated reservoir characterization from core data, special and standard methods of well logging, flow tests and production tests results in a new classification of reservoir facies and estimation of the range of the poroperm properties for the identified classes.
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Studying of Wave Processes in a Rock Mass by Technique for Recognizing Fractured Zones in Fields of Seismic Waves
More LessSummaryThe results of the application of the specialized interpretation technique for recognizing fractured zones in areas of fractured reservoirs in Eastern Siberia are presented. The technique is based on the search criteria we established in the amplitude and spectral parameters of longitudinal reflected waves, developed at the Mining Institute of the Ural Branch of the Russian Academy of Sciences. Prospecting indicators for fractured geo-objects of different types are established a posteriori by examining the links between fractures’ parameters and dynamic attributes both in the laboratory as well as under conditions of natural occurrence of rocks. he search for a physical justification for the established patterns of behavior of the dynamic parameters of seismic waves allows us to study and understand more deeply the wave processes occurring in an array of fractured rocks. The effect of increasing the value of the frequency coordinate of the centroid in the zones of small differently oriented cracks is revealed, which manifests itself both in mathematical and physical modeling, and on fractured objects of oil and ore deposits. It can be realized due to non-coherent summation of waves of different frequency and amplitude. The presence of different-frequency waves, in our opinion, is due to the internal structure of the fracturing zone, in which the formation of waves of different types: separate interference waves, multiply reflected from the superface and the subface inside the fracture; channel-wave signal - Rayleigh wave modes and Love wave modes; Monochromatic waves on which an incident wave splits in when reflected of non-mirror from geometrically and physically rough interfaces; diffracted waves.
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Global Climate Change
Authors I.I. Nesterov and V.I. SamitovaSummaryIn Geology, studied a wider range of measurement parameters, but most of them increases (decreases) under the influence of the moon, Sun and Galaxy in which Earth is situated. Therefore, in contrast to classical thermodynamics, and astrophysics made an attempt astronomical calculations to produce a new methodology using the parameters and processes of the past and what is happening on the Ground and its depths.
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Features of Changes of the Properties of Reservoirs and Oil of Massive Reef Deposits of Volgograd Region
Authors S.I. Chizhov, D.S. Sergeev, N.S. Sibileva, A.N. Stepanov and M.A. SibilevSummaryThe revealing of reguarlty of changes of reservoir properties (porosity) and formation hydrocarbon systems through the deposits height are of significant theoretical and practical interest for the massive (reef) deposits.Processing of the results of complex field-geophysical studies (porosity determination) through the wells of evlano-livensky horizon of Pamyatno-Sasovskoye field are selected and analyzed. In general, significant changes of reservoir properties of oil at the height of the deposits is not observed, however, in massive deposits with large floor oil-bearing porosity changes from the arched part of fluidmaster, the pressure saturation is changed by the same principle.
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Geologic-Geophysical Support of Drilling Horizontal Wells (LWD)
More LessSummaryThere are many of factors, which should be taken in geophysical methods for study horizontal wells during drilling. They are bound with characteristic of using the software-hardware complex of GWS (geophysical well surveys), technology of works in the planning stages and carrying out of studies. Also factors are coupled with methodical dimensions of treatment and interpreting geological-geophysical information. Developing systems of fields with horizontal wells - is the most promising direction for involving the hard-to-recover oil and gas reserves to the commercial production.
Geologic-geophysical support of drilling horizontal wells is managed round-the-clock for determining the optimal trajectory for the well’s horizontal section to ensure greater productivity, as well as for effective realization of the objectives, which were planned.
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Evaluation Test of Initial Information and Results of Data Processing of Geophysical Surveys of Wells at Creation of Seismogeological Models
More LessSummaryIn Western Siberia at the heart of the solution of explorative tasks on naphtha and gas the complex of the GIS methods — seismic exploration lies. Seismogeological models are a basis for creation of geological models of oil and gas objects. In recent years, in connection with complication of prospecting tasks, limitation of resources, special attention is paid to increase in effectiveness of geophysical surveys. Increase in requirements to quality of seismogeological models, causes increased requirements to quality of geophysical surveys in the wells providing a petrophysical basis of interpretation. Accuracy of a binding of data of seismic exploration and results of seismogeological constructions in general depends on their quality. In work the adaptive (operated) approach to data processing of the geophysical surveys of wells (GSW) for creation of seismogeological models based on formalization of an index of quality of results of processing and the interconnected accounting of major factors not of the bound to the studied objects is offered.
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Geological Structure and Petroleum Potential of the Area High-Latitude Ob Riverside
Authors I. Panteleyko, A. Rube, I. Supolkina and E. GachegovSummaryThe present article is based on results of integrated geological-geophysical researches. The article illustrates short data of geological-geophysical surveys, geological structure and petroleum potential of the field, estimation of the region petroleum potential and recommendation for search drilling.
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