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Geomodel 2017
- Conference date: September 11-14, 2017
- Location: Gelendzhik, Russia
- Published: 11 September 2017
1 - 50 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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