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Geomodel 2017
- Conference date: September 11-14, 2017
- Location: Gelendzhik, Russia
- Published: 11 September 2017
1 - 20 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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