- Home
- Conferences
- Conference Proceedings
- Conferences
Geomodel 2019
- Conference date: September 9-13, 2019
- Location: Gelendzhik, Russia
- Published: 09 September 2019
1 - 100 of 140 results
-
-
Stratigraphy, Facies and Oil and Gas Potential Prospects of the Upper Cambrian of the Igarka-Norilsk Structure-Facies Zone
By D.A. KomlevSummaryAs a result of detailed stratigraphic and lithofacies analysis of two standard sections of the Cambrian of the Igaro-Norilsk structure-facies zone, it was established that in the study area the Upper Cambrian deposits accumulated in 4 facial zones: 1) deeply submerged shelf and basin margin; 2) slope of the carbonate platform; 3) front of the carbonate platform; 4) shelf lagoon, intertidal and supratidal zones. The greatest development of reservoirs is predicted in the Kulyumbe, Uyigur and Tukalanda formations, which are represented by carbonate platform edge facies, polycyclic shallow lagoon and tidal flat sediments. The oil and gas potential prospects scheme have been composed on the basis of paleogeographic reconstructions taking into account structural and geochemical criteria.
-
-
-
The Forecast of Complexly Built Traps in the Kharasavey-Bovanenkovo Region of Western Siberia Based on the Results of Basin Modeling
Authors V.L. Shuster and L.I. ZinatullinaSummaryToday there is an urgent need to replenish the resource base by increasing hydrocarbon reserves. In recent years, more and more actively in all oil and gas producing countries of the world, the technology of oil and gas bearing systems modeling is used to solve problems associated with the forecast of oil and gas potential and the choice of priority areas of exploration for oil and gas. The technology allows you to create a regional geological model of any territory in size based on the complex of geological, geophysical and geochemical materials available at this stage, to evaluate oil and gas potential, bringing together the results of structural and litofacial analysis, petrophysical and geochemical studies, reproducing the fluid-dynamic development of the studied region at all stages of geological stories. The paper presents the main results of basin modeling and provides brief conclusions. Also, some information is presented in the work on the new technology of seismic prospecting of MOV OGT 3D using scattered waves, which makes it possible to forecast the development zones of decomposed reservoir rocks in dense rocks.
-
-
-
Artefacts of Diffraction Imaging and their Attenuation
By M. DenisovSummaryA formulation of the problem of the small scattering objects’ true-amplitude imaging is proposed. The model of the acquired wavefield and the algorithms for its inversion are studied. Evanescent wave processing tools to improve the imaging resolution are considered. The limitations of the Kirchhoff integral-based depth imaging are demonstrated.
-
-
-
Solving Problems Methods of Displacement Receiving Equipment in Transit Zones
Authors A. Levitskiy, A. Rudakov and M. LevitskayaSummaryThis article describes the main problem of a seismic crew operations in transit zones with ocean bottom cable (OBC) equipment. Required accuracy ensuring of receiving equipment layout. Online methods of vessel track course corrections at the time of pickup equipment is describes. This technique has significantly reduced the time of seismic work production. During of the seismic works, acoustic positioning is not carried out for all receiving points often. This primarily due is equipment high cost. Increasing accuracy of positioning sensors without acoustic positioning is carried out using the methods of interpolation receiver points coordinates, taking into account track of the vessel. Comparison of standard procedure of linear interpolation, as well as rationale use procedures for adjusting the receiver point position on the first break picking entry during the work in the OBC 3D modification.
-
-
-
South-East Pre-Caspian Post-Salt Succession. Application of 2D Full-Stack Seismic Inversion Technology for Predicting Reservoir Properties
Authors B. Oraz, G. Zholtayev, G. Akhmetzhanova, R. Abuyev and A. AkhmetzhanovSummaryThe results of 2D full-stack seismic inversion technology for predicting reservoir properties applied to the area under the study area within Triassic succession of the south-east Pre-Caspian sedimentary basin. Hydrocarbons, mostly oil trapped by salt dome wall and faults. Full-stack seismic lines, wireline logging data and seismic velocity were integrated to generate P-impedance volume. The porosity was estimated from the relationship between the absolute P-Impedance result and the porosity effective at the well locations. Generally, low P-Impedance or high porosity packages over the area indicate higher probability of hydrocarbon sands in the Reservoir interval. The localized high P-Impedance at the Reservoir interval at the northern part of area could reveal the distribution of the micro-conglomerate reservoir, however more geological-geophysical should be integrated to interpret anomalous geobodies. Data obtained allows concluding that it is not possible to discriminate the distribution of the hydrocarbon sands due to strong overlap of the acoustic impedance of the hydrocarbon bearing sands and the background lithology.
-
-
-
Geological Features of Triassic Sediments of the Eastern Edge of the Pre-Caspian Sedimentary Basin
Authors G. Zholtayev, G. Akhmetzhanova, R. Abuyev, A. Akhmetzhanov and B. OrazSummaryGeological settings, stratification and oil and gas potential of Triassic sediments within the Eastern margin of the Pre-Caspian sedimentary basin are considered. Noted absence of middle and upper Triassic sediments on most of the drilled prospects. Observed main features of formation stratification by geophysics and paleontological data.
-
-
-
The Geochemical Characteristics of the Organic Matter of Lower-Vendian Glacial Deposits of Pre-Ural Region Are Presented in this Paper
More LessSummaryFor the first time the lithological and geochemical characteristics of OM of the Lower-Vendian glacial deposits of Pre-Ural region are presented in this paper.
-
-
-
Primary Migration in Upper Jurassic Bituminous Shales and in Cretaceous Deposits Arctic Sector of Western Siberia
Authors A.V. Bochkaкev, A.V. Lobusev, M.A. Lobusev and U.A. AntipovaSummaryThe mechanisms for the formation of fissure capacity and industrial accumulations of hydrocarbons in isolated systems directly in carbonate-clay-siliceous rocks (bituminous shale), as well as the fluids breakthrough into the overlying deposits and their subsequent migration of different length through the permeable formations got additional confirmations from the interpretation of seismic data and deep drilling in anomalous zones of articulation of the Bazhenov formation (and its age analogues) with adjacent sediments of the Achimov formation.
-
-
-
Features of the West Siberian Megabasin Central Part Jurassic-Cretaceous Deposits Hydrogeochemical Conditions
Authors A.R. Kurchikov, A.G. Plavnik and M.V. ItskovitchSummaryThe method and results of modelling the hydrogeochemical spatial patterns in the Cretaceous and Jurassic sediments of the Koltogor and Tolkin troughs and surrounding areas of the West Siberian megabasin are presented. The model of hydrogeochemical conditions is constructed as series maps of the groundwater salinity in Formations, as well as NS and EW oriented cross-sections. Results indicate a significant variability of groundwater salinity both as a whole in the Jurassic-Cretaceous sediments, and within individual aquifer. The revealed substantial heterogeneity of hydrogeochemical conditions in the Jurassic-Cretaceous sediments indicates the complex genesis of the groundwater chemical composition.
-
-
-
Accounting for Anisotropy in the Variation-Grid Geomapping Method
By A.G. PlavnikSummaryThe problem of mapping for geological objects features with locally varying anisotropy is considered. Approach based on simulation of deformation of initially isotropic space is formulated. There are given examples of the problem solutions using variational method of geological mapping. The problem is reduced to modification of model conditions represented by partial differential equations using the Jacobi transformation matrix for the simulated deformation. The approach is applicable to the solution of two-dimensional and three-dimensional problems of mapping geological objects features with both homogeneous and inhomogeneous spatial anisotropy.
-
-
-
Application of the Latest Russian Technologies in Geomechanical Modeling of the Upper Part of the Section to Improve the Efficiency of Exploration Drilling
Authors E.V. Kireev, I.R. Khalilov, L.A. Andreev and M.A. SibilevSummaryThe existing geological and geophysical tools do not allow to forecast Petro elastic properties of rocks of the upper part of the section. Modern methods of GIS and seismic exploration do not allow to characterize the upper part of the section due to the limited diameter and depth. Therefore, to solve this problem in the marine environment, a technique was developed to predict the elastic properties of rocks according to engineering-geological surveys (hereinafter IGI).
-
-
-
Classical Phisycal Laws Generalization Relatively Electro/Gravitationally Investigations in Geophysics
More LessSummaryThe report presents the prolongation of the previous «Geomodel-2008/2009/2016/2017/2018» materials.
-
-
-
Multi-Scaled Fractured Medium Modelling by ACS Algorithms
Authors V.V. Masjukov and O.S. YurchenkoSummaryRecently we presented a new algorithm of natural fractal structure evolution (NFSE). Application of the algorithm in question with interpolation for sequential iterative reduction of the grid step gives opportunity for multi-scaled super-resolution imaging of fractured geological medium. The main goal of this approach is to fill (reduce) the objective information vacuum between seismic and wells scales. In the present study we develop new ACS (Ant colony simulation) methods for this purpose. A number of tests show that the new technology results are generally adequate to natural observations.
-
-
-
Numerical Simulation of Seismic Wave Propagation in Fluid-Saturated Geological Media by the Grid-Characteristic Method
Authors V.I. Golubev, A.V. Shevchenko and I.B. PetrovSummaryNowadays the seismic survey technology is widely used for the oil and gas fields exploration. In connection with the recent discovery of unconventional deposits, the task of improving its methods and approaches is important. Mathematical modeling may allow us to calculate seismic responses from the geological medium with a given structure in the reasonable time. Due to the increase of the computational power of HPC systems, more and more complex mathematical models can be used: acoustic, elastic, averaged fractured, etc. In this paper the process of the seismic wave propagation in fluid-saturated geological media is investigated. The Dorovsky model is used, which takes into account the porosity and other properties of the elastic skeleton and the saturating fluid. The authors expanded the scope of the numerical grid-characteristic method, previously well-proven in problems of seismic wave propagation in acoustic, elastic and fractured media. A two-dimensional formulation of the seismic exploration problem is considered. Formulas for the interior points of the integration domain were obtained, as well as the boundary condition on the “day surface”, in explicit form. Calculations illustrating the differences in the wave fields when using acoustic, elastic and fluid-saturated models for describing geological media were carried out.
-
-
-
Regularities of Distribution of Oil and Gas Deposits by Size of Reserves in Sedimentary Thickness
Authors E.A. Sidorchuk and S.A. DobryninaSummaryThe work is devoted to the estimation of prospects of oil and gas potential and to increasing of efficiency of geological prospecting works in the oldest oil and gas region of the pre-Caucasus. Actual material of approximately 300 deposits was used. The productivity level of deposits includes several stratigraphic complexes. The areas of distribution of oil and gas fields in stratigraphic complexes were mapped. The predominant direction of distribution of oil and gas potential on stratigraphic complexes in each of these areas is given. The distribution of hydrocarbon deposits by depth, stratigraphic complexes and reserves is shown. The regularity of hydrocarbon deposits in more ancient complexes to a greater depth is traced. Along the trend there is a decrease in the level of oil and gas positional. Along the line of trend there is a tendency of decreasing of deposits size in case of predominance of liquid hydrocarbons. The value of reserves along the trend tends to increase in the case of gas predominance. The deposits which by of the size reserves fall on numerical values from the described tendencies are marked. This can be explained by the existence of non-pre-searched or not discovered deposits in the prospective stratigraphic complexes.
-
-
-
SMARTCore an Effective Core Data Processing Instrument
Authors E.V. Stremichev and D.I. ChuprinkoSummaryRapidly gaining popularity, the modern trend of digitalization and automation of work with large data arrays is being introduced in oil companies and research institutes. The huge volume and diverse format of laboratory data on cores complicate the work of specialists in various fields. According to the research, 47% of the working time is spent on technical tasks of the same type when working with core. The developed prototype of the SMARTCore program is aimed at creating a unified relational database for all types of core studies, reducing routine operations at work, automatically creating petrophysical models with automated selection of all empirical coefficients using the differential evolution method. It is thanks to the creation of a unified and related database for all laboratory studies on cores that we can experiment with different combinations of data at lower time costs, which, in our opinion, will allow us to achieve greater accuracy of models given the greater number of factors.
-
-
-
Stratigraphy to Seismic (StS™): a Case Study from the Viking Graben, Norwegian Shelf
By I. GoginSummaryStratigraphy to Seismic (StS™) is a dynamic approach to integration and interpretation of seismic and stratigraphic data. It provides detailed chronostratigraphic, hiatal, palaeoenvironmental and sediment supply data for seismic interpretation. The detailed biostratigraphic analysis forms the basis of the method. The described method was applied to a multi-well study of the Viking Graben on the Norwegian Shelf. The example shows the application of the method on two wells from the study. The curves are plotted against the seismic profile and the interval for detailed biostratigraphic research is identified. With further study of the chronostratigraphic framework, the well correlation is resolved. The method allows rapid correlation and interpretation of the data.
-
-
-
Features of Productivity of Fractured Reservoirs on the Example of the Bazheno-Abalak Complex of the Krasnoleninsky Anticline
Authors S. Kuzmina, E. Avramenko, M. Grischenko and M. SmyshlyaevaSummaryThe work is part of a comprehensive study of the Bazheno-Abalak complex, carried out in order to create a methodology for forecasting productive zones. The report covers aspects of the tectonic development and structure of the object, the specifics of the sedimentation of the Bazheno-Abalaki complex, features of the formation and distribution of fracture in the section and in area. The results of a comprehensive study of different-scale methods (geophysical, core) and analysis of the fracture of the object and its relationship with productivity are presented The work is part of a comprehensive study of the Bazheno-Abalak complex, carried out in order to create a methodology for forecasting productive zones. The report covers aspects of the tectonic development and structure of the object, the specifics of the sedimentation of the Bazheno-Abalaki complex, features of the formation and distribution of fracture in the section and in area. The results of a comprehensive study of different-scale methods (geophysical, core) and analysis of the fracture of the object and its relationship with productivity are presented.
-
-
-
Research of the Characteristics of the System of Natural Fracturing and Cavernosity to Optimize the Development of Carbonate Reservoirs
Authors P.A. Likhachev, A.A. Kozyaev and E.I. SmolentcevSummaryReport on the impact and priority of fracture characteristics on the development of a carbonate reservoir. The relationship of these characteristics with the critical values of depression in the operation of wells. Recommendations are given on the wiring of the horizontal section of wells. The research is based on the analysis of a large amount of field information for 2015-2018 of one of the deposits of Eastern Siberia, in the area of the Yurubcheno-Tokhomskoy oil and gas accumulation zone.
-
-
-
Experimental Study of the Effect of Ultrasonic Treatment on the Rheological Properties of Oil and Paraffin-Containing Oil
Authors E.A. Marfin, A.I. Kadyirov, Y.V. Karaeva and M.M. GabdukaevSummaryThis paper is devoted to studying the effect of ultrasound on the rheological properties of natural and synthetic oil. Experimental data were obtained using a rheometer Physica MCR 102 and a vibration viscometer SV-10. It has been established that with prolonged ultrasound exposure, the viscosity of the oil increases. It is shown that ultrasound leads to a change in the activation energy of a viscous flow of paraffin-containing oil. Moreover, not only the percentage of paraffin and the duration of treatment, but also the temperature depend on the processing efficiency. The obtained results can be used to improve the regime parameters of the impact on oil during its production, transportation and storage.
-
-
-
A New Approach to the Construction of Seismic Boundaries in the Geological Environment Aaccording to 2D Profile Seismic Data
Authors V.I. Bondarev, S.M. Krylatkov, N.A. Krylatkova and A.N. KrylevskayaSummaryMethods for obtaining seismic images of the geological environment are based on the transfer of numerical characteristics of seismic wave fields determined at a certain time interval to the points of time (x, t0) or deep (x, z) section. However, often the images of seismic boundaries in difficult built environments on time (or deep) sections of CDP-2D, obtained by traditional processing by the method of common mid point, do not objectively reflect the true position of seismic boundaries in the section. A new approach to the definition and use of local angular parameters of reflecting boundaries for the construction of more objective images of seismic boundaries according to the data of profile observations of mogt-2D is considered. It uses information about the angles of inclination of seismic boundaries, previously found on experimental data. The basis of the transfer information from a seismic trace in point of the received image of the environment is the use calculated using the angular settings of the boundaries of the coordinates of the current point of reflection. The possibilities of their subsequent use to obtain a better understanding of the studied geological environments are shown.
-
-
-
Oil Saturation Determination in Horizontal Wells – Capabilities of Two Independent Approaches
Authors D.V. Shtepin, L.N. Urmantseva and A.V. MityaginSummaryComplex approach to oil saturation determination at the offshore oilfield named after Yuri Korchagin located in the north of Caspian Sea is considered in this paper. The field is operated by Lukoil-Nizhnevolzhskneft and actively developed from 2010. Advanced LWD technologies allow to obtain both conventional log data and data that can be used for resistivity independent water saturation estimation. This kind of data becomes valuable in case of shaly reservoir rocks and in case of ambiguous interpretation of free water presence in oil-saturated zones. Besides the standard approach with Dakhnov-Archie equation, 2 independent methods were applied: using formation sigma parameter and nuclear magnetic resonance data. Sigma allows estimate water saturation independently of resistivity values. This parameter was used in reservoir rocks above the oil-water contact and that are characterized by low resistivity values and as a result low oil saturation. NMR data were used to prove two independent calculations. In case of reservoir rocks with high shale content when sigma in shales is comparable to sigma in water NMR T2 distribution data helped to distinguish free water and capillary bound water.
-
-
-
Determination of Small Hydrocarbon Deposits using Prony Decomposition
Authors S.N. Smolin and G.M. MitrofanovSummaryThe search for small hydrocarbon deposits is the a difficult task for seismic exploration. For such reservoirs often there is no connection with the structural factor and they are weak manifested in the dynamic characteristics of the wave field. As a result, many small hydrocarbon deposits can be missed. The developed technology based on the Prony decomposition is a tool for studying the dynamics features of reflected waves at different frequencies. Take into acount that high-frequency oscillations react most acutely to the presence of collectors and the type of fluid, it is possible to identify them. The report provides several examples of relevant analysis. In particular, the reaction of seismic sygnals on the water deposit is demonstrated. It manifests itself at a frequency of 39 Hz, and with increasing frequency, such a reaction decreases to complete disappearance. At the same time, in the presence of oil or gas, there is an increase in the response of reflected signals at frequencies of 47 or 75 Hz, respectively, and its preservation at higher frequencies. The nature of the response of the reflected wave amplitudes is illustrated on figures and tested drilling.
-
-
-
The Main Directions and Results of the Federal Program of Geological Exploration on the Taimyr Peninsula and Gydane in the XXI Century
Authors N.Z. Munasypov and V.A. BaldinSummaryCurrently, the key task of the country’s oil and gas complex is the creation of new major hydrocarbon production and processing centers. Gydan, the Taimyr Peninsula and the shelf of Russian Arctic in the Russian Federation define the main directions of exploration in the XXI century. The main prospects for further development of the Russian oil and gas production complex are connected with these territories.
-
-
-
Amazonas – Stochastic Method of Modeling Geological Systems with Arbitrary Distribution of Properties, Including Statistically Unsteady Ones, Based on Non-Parametric Statistics
More LessSummaryThe paper considers the method Amazonas developed by the author, which is based on the use of non-parametric (rank) statistics in a sliding window of a given form. The use of nonparametric (rank) statistics, which makes it possible to model the spatial distributions of both discrete and continuous properties with arbitrary distributions of values, including multimodal, reproduce sharp transitions of properties without the need to build a facies model, provides resistance to clustering, incompleteness and the presence of individual error values in the source data. The ability to set an offset allows to reproduce both smooth and sharp transitions between the values, with a varying degree of variability to extrapolate the possible behavior of the system outside the studied area. The applied mathematical formalism makes it possible to obtain a realistic stochastic model of the simulated environment, directly determined by the initial data, taking into account the heterogeneity existing in it, which can be associated with lithology and other factors, without the need for preliminary expert identification of these laws. The method is suitable for modeling both stationary and non-stationary distributed spatial variables, and allows to take into account the instrumental error and the natural variation of the simulated parameters.
-
-
-
Solving of Automation Aims of Kinematic Data Interpretation with Using New Approaches Illustrated in West-Siberian and the North Sea Shelf Fields
Authors P.A. Avdeev, I.I. Efremov, A.K. Bazanov and R.F. MiftakhovSummaryFaults and horizons correlation is a crucial stage in the cycle of seismic interpretation because it determines the structural framework of the field. Also, it is used as a basis for the subsequent dynamic analysis of the wave field. At the same time, the process of tracking horizons and faults continues to be one of the most labor-intensive stages, requiring a significant amount of time and human resources. Today, the geophysical service has a wide range of technological solutions aimed at automating the process of tracing reflections and fault surfaces. However, each of the proposed technologies has a series of limitations caused by the impossibility of fully automating procedures when working in the complex geological environment, as well as with low-quality seismic material. Thus, oil/gas and service companies invest a lot of effort in the optimization of structural interpretation because it is of paramount importance for the production cycle. The paper presents a new viewpoint to tackle the problem of automated interpretation under mentioned complications.
-
-
-
Achimov Static Models Uncertainty Analisys Methodology and Practice within Urengoy Field
Authors V.O. Monakhova, N.Y. Natchuk and S.I. PakhomovSummaryAchimov deposits of Urengoy field contains the main gas reserves within considered license block, however they are characterized by a complex geological structure. That’s why it’s especially important purpose to estimate possible uncertainties and risks in the reserves and the forecasted profiles of hydrocarbon production. Uncertainty analysis allows to create of the set of geological model’s realization, considering main risks and allowing to estimate the range of uncertainty and probability of the hydrocarbon reserves by reference to the features of Achimov deposits geological structure. Sequence of work on the uncertainty analysis of geological model includes: creating of the base geological model (form workflow); definition of the base parameters, which bring in uncertainty in the model, and range of their uncertainty; uncertainty analysis of the hydrocarbon reserves to changes in parameters; choosing of the most influential parameters; multiversion calculation. In the result of work range of changes in Achimov deposits gas reserves and range of changes in the main volumetric parameters were justified, besides 300 realizations of geological model were calculated, which can be used as a base for hydrodynamic calculations, for planning of drilling location of projected wells and for making of further research program of reservoir.
-
-
-
Creating a Conceptual Model of the YuV2 Reservoir of the Bakhilovsky LU in Order to Identify New Promising Objects
Authors I.V. Geyst and T.P. KurashSummaryThe paper describes an algorithm for building a conceptual model which includes a paleotectonic analysis to restore depositional environments, section breakdown using a sequence-stratigraphic approach, an analysis of reservoir electrofacies characteristics, a reconstruction of a depositional model, and an analysis of seismic attributes at the qualitative and quantitative levels. The resulting data was used to build a conceptual model of JV2 reservoir of Bakhilovskoye Field, identify drilling-promising areas, and make a variable resource estimate.
-
-
-
Auto-Building Prior Geo-Models Using Well Log Clustering Tools on the Example of the BS Productive Formation
Authors I.M. Shiryaev, R.F. Miftakhov and A.K. BazanovSummaryFacial zoning based on field data along with the classification of well logs sections is one of the critical stages in the creation of a fundamental geological model. In this case, the classification of well sections is most often carried out manually, which implies a considerable investment of time resources and subjective results. Various automation methods are used to accelerate the process of facies modeling and obtain more objective results.
-
-
-
The Features of Lithofacies Architecture of Turonian Deposits in West Siberia (The Case Study of Kharampurskoe Field)
More LessSummaryThe report deals with the analysis of Turonian lithofacies structure using the case study of one of the fields of West Siberia. In West Siberia, the Turonian is a prospective target owing to its gas content. At the same time, this type of sediments falls under hard-to-recover reserves. The major challenge in the study and development of such accumulations are their low reservoir properties due to high clay content and near-surface conditions. Lithofacies analysis was based on core studies (of 5 wells). In general, the reservoir is composed of siltstones with various content of clay and sand fractions, intensively bioturbated, with frequently occurring marine fossils. Rock typing was based on core laboratory investigations. The main criteria for classifying the rocks into lithotypes which affect petrophysical properties are the grain size distribution (sand material admixture) and clay cement content. A cyclic sequence has been recognized that consists of four cycles. Each cycle is characterized by regressive nature. It has been found that the cycles in the northern and southern parts of the field have different thickness, which is attributed to several sedimentary material source areas.
-
-
-
Increasing the Reliability of Structural Map-Making in the Areas with Local Velocity Inhomogeneities Resulting from the Neotectonic Processes
Authors T.A. Nesterova, E.S. Matrosova and A.A. MikhailovSummaryLateral variations of the elastic velocities within sedimentary cover in West Siberia are considered to be smooth and slight except in case of the near surface section. Though the experience of the work in some areas of the southern part of West Siberia shows considerable local lateral velocity inhomogeneities in the middle part of section confirmed by the drilling and VSP (vertical seismic profiling) data. These inhomogeneities cannot be recognized when analyzing two-way traveltime to the reflecting boundaries and differences between them obtained from the seismic data. When the area of research is underexplored by drilling that is typical for the search stage, structural imaging is generally based on the seismic information. When using standard techniques of calculation of structural maps it’s impossible to take into account these local lateral velocity inhomogeneities, resulting in discrepancy in 25–30 m between the actual and projected depth of target horizons at further drilling. A simple technique for increasing the reliability of structural map-making is suggested for its further testing.
-
-
-
Geomechanical Modeling Pre-Upper Thrust Belts of Southern Urals
Authors L.I. Minligalieva, V.Y. Kerimov, V.A. Kosyanov and R.N. MustaevSummaryThe article is devoted to the study of a large structural element of the Western Urals - the reverse-thrust belts of the Pre-Ural marginal deflection. The entire Ural cover-fold region represents a giant allochton on the outskirts of the East European Platform. The study of the geological structure of the Urals and the East European Platform showed that the real picture of dislocations includes faults as a mandatory element. The horizontal forces of compression, directed from the Urals, determined the formation of the thrusts and supports and genetically associated anticlinal structures. All plicative forms are subject to thrusts and reflect the subsequent collapse of layered strata occurring under the conditions of lateral compression. In many wells drilled in the Urals, in the sub-thrust sediments, intense oil and gas shows are noted, indicating a possible accumulation of oil and gas deposits here. The result of intensive deep exploration carried out in the trough was the discovery of a large number of hydrocarbon fields. In the course of the work, paleotectonic reconstructions based on geomechanical modeling, numerical spatial-temporal basin modeling were used, which allowed to reveal the structural evolution of the reverse-thrust belts, time and conditions for the formation of traps.
-
-
-
Typification of the Prisakhalin Shelf faults based on simulation results
Authors V.Y. Kerimov, A.V. Bondarev, R.N. Mustaev and L.I. MinligalievaSummaryAccording to the results of the tectonic analysis, a map of faults and three-dimensional disturbances for a regional scale was compiled, and genetic typification of faults and their systems was carried out and their ages were determined. As a result of the tectonic analysis, we were able to carry out a generalization of the initial information about the faults, which led to a significant reduction in their number. According to the results of the analysis, 3-D models of development of faults were created for individual license areas.
-
-
-
Comparative Analysis of East Arctic Basins Evolution
Authors E.A. Lavrenova, V.Y. Kerimov, A.G. Burguto, A.A. Gorbunov and R.N. MustaevSummaryEast Arctic offshore is expected to contain a significant amount of hydrocarbons. Up until now, it is a frontier area with sparse seismic data and lack of exploration wells. So, it is the case to put on analogy to estimate its petroleum potential. Northern Alaska nearest well-studied prolific petroleum province is supposed to be the main counterpart. Comparative analysis of East Arctic sedimentary basins development, including Laptev, East-Siberian, Chukchi shelves as well as North Slope performed under the investigations, which prime objective, is to understand their similarities and differences. Results revealed a high probability of petroleum systems existence in the sediment cover of East Arctic basins. However, despite all expectations, there are no analogs among them. Burial history and thickness of overburden rocks are the key factors of petroleum system maturity and potential.
-
-
-
Scalable Basin Modeling – an Application for Petroleum Exploration
Authors E.A. Lavrenova, V.Y. Kerimov, A.A. Gorbunov and R.N. MustaevSummaryBasin Modeling is a powerful tool for oil and gas exploration. But it is always a non-trivial task to prepare model geometry since seismic interpretation is still an intensive and time-consuming process based on manual picking or auto-tracking of a single horizon. Only the main geologic boundaries one can obtain this way and solve merely regional tasks. Scalable Basin Modeling (SBM) technology overcomes this problem by using Stratigraphic Cube (SC) calculated automatically from seismic. SBM involves the complete set of seismic data and provides a convincing approach to construct sufficient input geometry for modeling. The technology supplies compatible nested models of the Basin, Petroleum System, and Play, based on the single detailed grid of SC. Browse basin case study demonstrates the high effectiveness of SBM under a complicated geologic condition with rapidly shifting depositional systems.
-
-
-
Accounting of the Facial Layer U1 in the Permeability Forecast on the One of Fields of Western Siberia
Authors A.A. Shtyrliaeva and I.I. ZayrullinSummaryThe report shows the dependence of petrophysical parameters on the conditions of sedimentation of the reservoir. The study is based on a comprehensive analysis of core data, seismic and well logging. The absence of contradictions between these data allowed us to confidently determine the conditions of sedimentation of the reservoir. Petrophysical dependencies confirmed isolated facies. Facial logging is used to calculate permeability in wells with different facies.
-
-
-
Geological and Geophysical Model of the Pre-Jurassic Base of the Central Part of the West Siberian Platform
Authors S.F. Kulagina, A.V. Tugareva, E.V. Belova and G.A. ChernovaSummaryThe study of the geological structure of the deep layers of the West Siberian Platform is important for replenishing the resource base of hydrocarbons. The report is devoted to the construction of a two-dimensional geological and geophysical model of the pre-Mesozoic mega complex based on the integration of drilling data, potential fields and regional seismic profiling.
-
-
-
Two-Dimensional Inversion of Russian Electric Logging Signals Measured at Intervals of Complex Sediments
Authors A.M. Petrov, O.V. Nechaev and K.V. SukhorukovaSummaryTwo-dimensional numerical inversion is widely used by leading foreign oilfield services companies to process electrical measurements from intervals of deposits with complex structure. However, the design features of the instruments greatly complicate the use of this approach for processing measurements of Russian electric logging methods. For this reason, now two-dimensional inversion of Russian electric logging measurements is limited to processing small data intervals in scientific researches. We have developed software and technique for a two-dimensional data inversion of high-frequency induction logging sounding (VIKIZ) and Russian lateral logging (BKZ), measured in intervals of thin anisotropic layers interbedding. With use of high-precision numerical two-dimensional simulation, it becomes possible to more accurately estimate the electrophysical parameters of the environment compared with the traditional one-dimensional approach. Software and technique have been tested on a large volume of realistic isotropic and anisotropic models of terrigenous sediments with a complex invasion profile and on the practical data of BKZ and VIKIZ, measured at intervals of Western Siberia terrigenous sediments. The results of testing confirm the applicability of new software for building geoelectric models of complex sediments with evaluation of their vertical resistivity and dielectric permittivity.
-
-
-
Accounting for the Influence of Inhomogeneities of the Upper Part of the Section by a Complex of Geophysical Methods
Authors I. Mityunina and S. BychkovSummaryTechnology of construction of geologic-geophysical model by complex interpretation of CDP data, high-precision gravity measurements and vertical electrical sounding is suggested. Technology is realized on a base of ArcGIS. Model created makes it possible to correct promptly near-surface effects on processing and interpretation of geophysical data.
-
-
-
Using the Results of Geomechanical Modeling for the Analysis of Seismic Responses from Fractured Objects
Authors A.V. Ekimenko, D.C. Gallyamova and V.I. GolubevSummaryThe paper deals with the issue of the degree of influence of fracturing of rocks on the wave field recorded in the process of seismic exploration of oil and gas fields. The authors analyze which features of the wave field can be used to study the internal structure of the reservoir.
-
-
-
Comparison of Efficiency of Different Methods of Seismic Inversion in the Context of Carbonate Deposits and Lack of Data
Authors S.V. Egorov and E.V. ZubovaSummaryThe paper is dedicated to the possibility of carbonate reservoir properties prediction with the use of results of seismic inversion. Authors propose improved method of seismic inversion which implicates use of results of genetic inversion as trend for rising of low-frequency model accuracy. Also the method supposes signal changing over time. As the result final acoustic impedance cube gets higher quality. Resulted cube was used as trend for reservoir properties modeling goals and final prediction was better than prediction obtained without trend. Method was prepared in the context of one oil field and was in further tested on another field and final results were satisfying too.
-
-
-
Modern Gravity Survey in the Study of the Geological Structure of Oil and Gas Promising Objects
By S.G. BychkovSummaryThe hardware, software and methodical possibilities of modern gravimetric prospecting and their application are considered for receipt of informative and geologically meaningful models of oil and gas promising territories and objects. Presents the results of gravimetric studies on the territories with different geological structure, based on the modern theoretical and software basis of the gravity field anomalies interpretation.
-
-
-
Local-Scale Prediction of Zones of the Collector Under Conditions of Saturation of the Cross-Section with Intrusive Body near Location Parametric Borehole Tynepskaya-215 using of the Complex of Geophysical Methods
Authors I.I. Ivanova, A.A. Belaya, E.N. Makhnach and G.M. TrigubovichSummaryResearches were conducted within the Bakhtinsky megaway of the South Tungus NGO. The aim was to identify areas of presence of reservoirs that are promising for the detection of hydrocarbons. The task is complicated by the presence of trap magmatism. The object of the Researches was a limited amount of geological environment in the area of the near location parametric borehole Tynepskaya-215. The forecast was carried out on the basis of a complex of geological and geophysical researches.
-
-
-
Reconstruction of the 3D Model of the Geological Structure of the Near-Borehole Space in the Area of the Parametric Borehole Vilyuykanskaya 1 by the Complex of Geophysical Methods
Authors A.A. Belaya, E.N. Makhnach, I.I. Ivanova and G.M. TrigubovichSummaryThe report includes a modern approach to the joint 3D-interpretation of the MT and TEM electrical prospecting data with the aim of the research the geological structure of the Lower – Middle Cambrian reef formations near the location of the parametric borehole Viliuykanskaya 1 (eastern side of the Kureiskaya syneclise on the Siberian platform). Also, a set of methods included monitoring studies using seismic emission methods, complex aerogeophysical research, and reinterpretation of seismic data. As a result, the prediction of the development of organogenic structures was made, their internal structure was explored and the quality of the shielding properties overlapping the structures of the clay-carbonate sediments of the Verkholenskaya suite was evaluated. Most of the seismic emission anomalies are confined to the boundaries of the proposed structures, where there is probably an increased migration of fluids and gases.
-
-
-
Oil and Gas Potential of the Northeast Part of the Siberian Platform
Authors D.S. Lezhnin, P.N. Sobolev and S.V. KotovaSummaryIn the present work, on the basis of complex seismic data, GIS and results of core laboratory research, four major promising oil and gas bearing complexes were identified: Upper Riphean, Upper Vendian-Lower Cambrian, Upper Cambrian and Permian-Lower Triassic. For each complex: the permeable part, seal, source rock, as well as the most perspective zones of oil and gas accumulation and the main morphogenetic types of traps were determined.
-
-
-
Clarification of the Deep Geological Structure and Hydrocarbon Potential of the Yenisei-Khatanga Regional Trough on the Complex Electrical Methods TEM and MTS
Authors E.N. Makhnach, A.A. Belaya and A.V. MamaevaSummaryThe report considers the results of complex geophysical researches by TEM and MTS, conducted out in 2016-2018 within the Yenisei-Khatanga trough. This method of research allowed to study in detail the structure of the upper part of the section by TEM, and with the help of data obtained by MTS to clarify the deep geological structure. The possibilities of electrical prospecting in solving the following tasks are formulated: research in conjunction with seismic exploration and drilling of the Jurassic-Cretaceous part of the section; research of the structure of the Paleozoic complex; research of zones of articulation of large geoblocks, deep structure of the earth’s crust and upper mantle; research of cryolithozone.
-
-
-
Prediction of Lithological Traps in the Bottom of the Subcycle AC12 (Border Akhskaya and Cherkashinskaya Formations) Based on Seismic Data on the Example Priobskoye Feld
More LessSummaryDelineation of lithologic traps methodology in the bottom of the subcycle AC12 has been considered on the example Priobskoye field. The job has been done based on 3D seismic and geological model. There has been used log interpretation while complexing. The analysis of the reflector Hah (the top of Akhskaya formation) has been done. As a result, the area has been divided into 4 parts by quality of reflector. In the zone of articulation of two such sites, the erosions zone has been detected. This zone is controlled by a deep fault. The discovered erosions form lithological traps, which are isolated from the deposits of overlying objects.
-
-
-
Acoustic Emission Events Reconstruction Method from the Physical Experiment Records
Authors G.V. Reshetova, A.V. Anchugov and N.V. YurkevichSummaryThe paper presents the results of laboratory experiments and numerical modeling for solving the problem of acoustic emission event recovery. The equations of the dynamic theory of elasticity in the polar coordinate system were used as a mathematical model. The simulation results made it possible to evaluate a number of basic characteristics for the configuration of a multichannel data acquisition system, the frequency of the AE signals, to determine the required number of recording channels and the position of the sensors in the core., The 3D modeling is planned in the near future in order to develop a mathematical method for reconstructing the AE events from the records of a real physical experiment.
-
-
-
The Ability to Assess Data Processing 3D Seismic Acquisition using VSP
Authors V.A. Lensky, A.S. Zhuzhel and F.S. SalichovaSummaryIn recent years, attention has been focused on the use of vertical seismic profiling (VSP) in the processing and interpretation of 2D/3D surface seismic data. One of the tasks is to assess the quality of data processing. Traditionally, the evaluation of the quality of processing, binding, reflection, and phase shift in seismic acquisition 2D/3D are performed by comparison with synthetic traces calculated with the momentum extracted from the CDP data. Such estimation may not correspond to reality, especially when using synthetic data of acoustic and density logging. The solution to these problems with the use of VSP provides a more accurate result.
-
-
-
Reservoir Parameters Prediction Using Seismic Waveforms Based on Neural Network
Authors I.I. Priezzhev, A.A. Polyakov, I.A. Murzov, S.S. Gavrilov and E.E. SapogovaSummaryQuantitative prediction of effective reservoir parameters by a set of seismic attributes is an important step in the interpretation of seismic data, and the construction of maps of effective thicknesses is one of the main results of such work and serves as the basis for the laying of new wells in the operation of oil and gas fields. Typically, these constructions are performed based on linear regressions obtained in the process of attribute analysis based on the data of effective thicknesses of previously drilled wells and the selected set of seismic attribute maps. It is known that such an analysis is a rather complex operation and it is easy to obtain an unreliable forecast in complex geological conditions using the wrong set of attributes. Another very common technique is the use of the seismic waveform for seismic facies analysis. Such analysis is usually performed based on unsupervised classification algorithms. It is proposed to use seismic waveform for quantitative forecasting based on neural networks.
-
-
-
Neocomian Sequence Zonation in the Rakushechnaya High (North Caspian Offshore)
Authors M.M. Kavun, S.A. Potryasov, V.R. Kuzakov, A.G. Alexeev, A.S. Shtun and S.Y. ShtunSummaryThree large offshore fields (Filanovskogo, Korchagina, Rakushechnaya) are covered by 3D seismic survey and 18 exploration wells give us important information concerning to sedimentary circumstances in the Neocomian. Sedimentation in two main zones was different and changed in time sequence, besides some transition zone cover the extensive area in the central part of studied high. Main factor was eustatic oscillations of the sea level.
-
-
-
Multiphysics Models of Oil Reservoirs: Organization of Database ATLAS MPhM
Authors G.V. Nesterova, I.N. Yeltsov, A.Y. Sobolev and I.V. SurodinaSummarySystematic set of the multiphysical models of typical oil reservoirs organized to the database ATLAS MPhM. It is constantly updated with new models based on the received practical data. Geomechanical, hydrodynamic, geoelectric processes in the borehole environment and well logs are jointly analyzed. Each multiphysical model includes parametric description of the reservoir and drilling mode, calculated water saturation and mineralization, electrical resistivity and relevant electric and electromagnetic logs. The choice of a model from the ATLAS MPhM can be made according to the range of parameter values or according to the deviation of synthetic and practical logs. The ATLAS MPhM also includes visualization tools which demonstrate changes of water saturation and mineralization, and electrical resistivity both with time and depending on various model parameters.
-
-
-
Electrophysical Properties of Bazhen Formation Based on the Numerical Inversion of Electrical Log Data
Authors M. Epov, K. Sukhorukova, V. Glinskikh, A. Petrov and A. FedoseevSummaryWe have developed new software for the numerical inversion of galvanic and induction measurements. Developed software is based on finite-element algorithms for 2D and 3D signals simulating and numerical analytical algorithms for electromagnetic signals transformations. Parallel computations on CPU and GPU are used to speed up the solution of direct problems in complex medium models. We use the BKZ (unfocused lateral logging tool with gradient arrays) and VEMKZ (high-frequency electromagnetic sounding tool) signals to estimate the electrical anisotropy and dielectric constant of impermeable high resistivity deposits. Using developed algorithms we performed the interpretation of practical data measured with SKL logging equipment on the Bazhenov Formation intervals in the central regions of Western Siberia. The electrophysical parameters of the Bazhenov Formation and stratigraphically identical deposits are studied, the material composition is determined, the main lithological types are identified. The results of the numerical inversion are consistent with laboratory measurements.
-
-
-
Dynamic Analysis of CDP-3D Data in Order to Identify Promising Oil Sites in Achimov Deposits Using the Example of the Danenberg Oilfield
Authors M.Y. Ivanitskiy and A.A. LeonovSummaryThe paper presents the results of a dynamical analysis of CDP 3D seismic data from the Lower Cretaceous interval of the Aleksandrovsky fold in Tomsk region. The analysis and isolation of seismic phrases was done using seismic surveys, core samples, and GIS data from 14 wells drilled within the seismic network. In accordance with the results of the interpretation, a facies partition was performed and features of productive deposition within the Achimov stratum of the Megion series of the B16-20 formation of the Danenberg field were refined. The deposit is located in the Aleksandrovsky district of the Tomsk region.
-
-
-
Prospects for Oil and Gas Bearing Deposits of the Upper Devonian in the Sections of LLC RN Severnaya Neft
Authors A.V. Samoyolov, I.G. Sverdiev and E.N. GruzdevSummaryThe carbonate strata of the Upper Devonian make up a significant portion of the sedimentary cover of the Timan-Pechora province. Domanikits are the source rocks for hydrocarbon deposits in the Upper Devonian sediments. Domanikites - highly bituminous siliceous-carbonate-clay deposits, which are the main generators of oil. Therefore, their study is given special attention. Numerous studies in the Timan-Pechora province have shown the prospect of prospecting and exploration of Domanikite deposits.
-
-
-
Prospects for Determining Hydrocarbon Accumulations in the Structures of Allochtone of the Southern Cis-Patom Regional Trough
More LessSummaryThe paper discusses the features of the geological structure and the prospects for identifying new hydrocarbon accumulations in the southern part of the Cis-Patom regional trough. The results of geological and geophysical exploration carried out in the studied area are analyzed. According to seismic data, linear zones of anticlinal structures formation with elements of over-thrust tectonics are outlined, within which additional seismic surveys are necessary. Hydrocarbon prospects for the identified structures may be related to the carbonaceous horizons of the Vendian and Lower Cambrian. In order to increase the efficiency of the exploration process in the studied region, it is necessary to improve the traditional CDP reflection seismic survey and to use advanced techniques for data processing, as well as to integrate seismic exploration with other geophysical methods.
-
-
-
Seismogeological Characteristics and Oil and Gas Potential of the Arctic Regions of the Siberian Platform
Authors V.A. Kontorovich, A.Y. Kalinin, L.M. Kalinina and M.V. SolovevSummaryDuring the research seismogeological models of the Neoproterozoic-Phanerozoic sedimentary complexes of the Siberian Platform (Anabar-Khatanga and Lena-Anabar oil and gas regions) northern part were constructed. It is concluded that in the Anabar-Khatanga and Lena-Anabar oil-and-gas areas Permian anticlinal traps complexly related to the salt diapirs have the best prospects of petroleum production. The carbonate deposits of Riphean-Carbon are also of interest. The existing geological and geophysical materials do not allow precisely stratify the Laptev Sea basin sedimentary cover. The thickness of platform deposits in which reaches 14–15 kilometers. From the structural-tectonic and general-scientific positions, this sedimentary basin is located in favorable conditions for the formation of hydrocarbon fields.
-
-
-
Pyrolytic Studies as a Basis for an Objective Assessment of the Hydrocarbon Potential of the Bazhenov Formation in Western Siberia
Authors I.S. Gutman, G.N. Potemkin, A.Y. Baturin, M.Y. Maslanko, E.V. Kozlova, M.Y. Spasennih and T.D. BulatovSummaryPyrolytic Studies as a Basis for an Objective Assessment of the Hydrocarbon Potential of the Bazhenov Formation in Western Siberia.
-
-
-
Features of Acoustic Emission Spectra when Filtering Gas Tthrough a Synthetic Porous Medium
Authors A. Abdrashitov, A.R. Galimzyanova, E.A. Marfin and Y.S. KokhanovaSummaryThe paper presents the results of the study of acoustic emission of a synthetic porous medium when filtering gas through it. The created samples were obtained by sintering microscopic glass beads in a muffle furnace. Scanning electron microscopy of samples revealed features of the morphology of the created samples. The characteristic and distinctive features of the filtration noise spectra in such media are established. The results obtained can be used to develop the theory of acoustic emission in saturated porous media when filtering through the bottom of various fluids.
-
-
-
The Analysis of Lithologic Differences and Collectors on GIS in Pre-Jurassic Deposits in the West of the Tomsk Region
Authors O.V. Zolotova, O.V. Chikisheva and Z.A. PozdeevSummaryIn work the main methodical approaches according to the analysis of lithologic differences and collectors in deposits of a pre-Jurassic complex are considered.
-
-
-
The Approach to Parametric Nonlinear 3D Inversion of Electrical Prospecting Data with the Recovery of Curvilinear Boundaries Between Geoelectrical Layers
SummaryThis paper considers the approach to parametric nonlinear 3D inversion of electrical prospecting data, which is improved by the possibility of searching for the shapes of the boundaries between geoelectrical layers. The boundaries between the layers are represented by bicubic splines and parameterized with the use of control points. Inside each layer, the system of geometric and physical parameters is used. This system allows the search of laterally (and, possible, vertically) inhomogeneous conductivity inside the layer including the search of local 3D inhomogeneities. The direct problem solution is performed with the use of the vector finite element method on non-conforming meshes. The workability of the proposed approach is demonstrated using the synthetic data for the complex geoelectrical model, which is typical of oil fields of Eastern Siberia. It is shown that the application of the proposed approach makes it possible to recover the structure and electrophysical properties of the upper part of the section as well as the total conductivity and shape of the target reservoir using the electrical prospecting data. The error of determining the depth of the reservoir middle line does not exceed 5% relative to the absolute depth of its location.
-
-
-
The Approach to 3D Modeling and 3D Inversion of Magnetic Gradiometry Data
Authors M.G. Persova, Y.G. Soloveichik, D.V. Vagin, D.S. Kiselev and N.S. KondratyevaSummaryThe paper proposes the approach to 3D modeling and 3D inversion in which the observed data are the second and third invariants of the magnetic gradient tensor. This enables not only to detect the bodies with abnormal magnetic properties but also the magnetization vector direction. This, provides additional opportunities for further geological interpretation. In order to calculate the abnormal magnetic field, we propose to use two approaches: analytical and numerical. The analytical approach is used in the case when the abnormal magnetic bodies are characterized by only remanence and/or magnetic permeability differing from the vacuum magnetic permeability not more than 10%. We present the results of comparison of the numerical and analytical methods and results of 3D inversion on the synthetic magnetic gradiometry data, which are obtained for the complex model containing two bodies with remainence; same direction as the Earth’s magnetic field and the distributed structure with remanence in the opposite direction to the Earth’s magnetic field. The approach proposed for mathematical processing the magnetic gradiometry data allows not only the general detection of the abnormal magnetic structures but also the delineation of local bodies the magnetization vector direction which is different from the magnetized surrounding structure.
-
-
-
Field Expedition Trips for Oil and Gas Exploration in XXI Century
Authors S.M. Astakhov and A.E. KhardikovSummaryGeological expedition trips – it was impossible to imagine the oil and gas exploration in the pre-war period without them. In the second half of the XX century, the hammer as an instrument of obtaining new knowledge was replaced by geophysical equipment. However, over the past 10 years there has been a tendency to resume the study of sections of target sedimentary complexes in outcrops. In this regard, the companies organize geological expeditions in the areas of exploration, both in the territorial part and in the water area (on adjacent land) for a period of 2 weeks to 2 months with the participation of their own and invited specialists. This is due to: a) the development and implementation of new laboratory methods of research, for their application requires the collection of new samples; b) the periodical appearance of new surface oil and gas seepages in regions with active seismicity and tectonic movements; C) the need to use the data of the structure and stratigraphy of sedimentary complexes in outcrops with seismostratigraphic models and simplify seismic interpretation.
-
-
-
The Approach to the Automatic Adaptation of a High-Viscosity Oil Field Hydrodynamic Model Based on the Multidimensional Inverse Problem of Multi-Phase Filtration
SummaryThis paper proposes the approach to the solution of the multidimensional inverse problem of multi-phase filtration in porous media for obtaining the hydrodynamic model of the oil field in order to plan its further development in an optimal way. The approach is based on simultaneously searching for the geometry of the subdomains-contours inside the geological layers and their physical parameters: initial saturations of filterable phases of the matrix-geological formation including the absolute permeability, parameters of the relative permeability depending on saturations, and porosity. This approach is demonstrated on the synthetic data obtained with the use of hydrodynamic modeling for the model constructed on the basis of the data observed in the wells of one of the high-viscosity oil fields in Tatarstan. The results of this research show that the approach proposed to construct the hydrodynamic model of the high-viscosity oil field on the basis of the inverse problem solution enables to recover quite accurately the initial state of the field, and, consequently, obtain the adequate state of the field in different time instants after starting its development. This makes it possible to plan in an optimal way further development of the oil field on the basis of its digital model.
-
-
-
Improving the Quality of Seismic Images of Complex Media by Creating an Orthorhombic Anisotropic Velocity model on the Example of the Onboard Zone of the Caspian Depression
Authors S.O. Suslov, P.S. Bekeshko and Y.V. LaptevSummaryCurrently, there is a steady tendency to complicate the geological tasks assigned to seismic exploration. The depletion of oil fields with traditional types of traps compels you to examine difficult-configured objects for the study of which requires a high level of program-algorithmic support of data processing. A special place in the modern graph of seismic data processing is the stage of migration transformations due to its significant impact on the final geological model. The quality of the seismic image is essentially determined by the accuracy of the restoration of the depth-velocity characteristics of the investigated area. At the moment, the most common approximation of anisotropic properties of real media is the model of transversal anisotropy. This type of model is quite simplified, especially taking into account the effective nature of the anisotropic parameters determined from seismic data. Orthorhombic anisotropy, in turn, is a more correct model that allows solving the problems of seismic migration relatively accurately. This paper demonstrates the construction of a deep-velocity model within the concept of orthorhombic anisotropy on the example of the side zone of the Caspian depression.
-
-
-
Detection of Reservoirs of the Reservoir U1. Detailed Analysis of the Wave Field and Seismic Limitations
By A.A. VazaevaSummaryThe paper presents a practical example of studying the upper Jurassic interval at one of the sites in Western Siberia. In conditions when quantitative prediction of properties is impossible, the authors involve wave modeling and detailed waveforms. This reduces uncertainty in the prediction of zones with improved reservoir properties.
-
-
-
Hydrothermal Modelling of Formation of Secondary Reservoirs in Siliceous Limestones (H2O-CO2 System)
By M. ZubkovSummaryThe results of hydrothermal modeling of the formation of secondary reservoirs (hydrothermal silicites) in siliceous limestones in the H2O-CO2 system are considered. Equilibrium mineral associations were established for various values of temperature and CO2 content in the composition of the hydrothermal fluid. The causes of silicification of the surface of siliceous limestone specimens have been identified. The most stable and, on the contrary, the most unstable minerals in hydrothermal conditions that are part of siliceous limestones have been established. The sizes of secondary voids of hydrothermal origin are determined. On the basis of the obtained data, it was concluded that the resulting hydrothermal silicites, due to the predominance of small voids in them, will contain large amounts of residual water.
-
-
-
Use of the Wasserstein Metric to Solve the Inverse Dynamic Seismic Problem
More LessSummaryThe inverse dynamic seismic problem consists in recovering the velocity model of elastic medium based on the observed seismic data. In this work full waveform inversion method is used to solve this problem. It consists in minimizing an objective functional measuring the difference between observed seismic data and modelled ones. The L2-distance is usually used as such a functional, but here it is proposed to use the Wasserstein metric since it has several advantages compared to the L2-distance. This work also presents and discusses the results of numerical experiments, including a comparative analysis of the velocity models recovered using the Wasserstein metric and L2-distance.
-
-
-
On the Selection of the Eigenmodes of an Anisotropic Waveguide
Authors A.A. Nikitin and T.V. ZharnikovSummaryRecently, the analysis of anisotropic elastic properties of rock has become increasingly important. This is due to the increasing importance of geomechanical analysis required for solving such tasks as designing hydraulic fracturing, predicting the wellbore stability and others. Sonic logging is primary method for determining the anisotropic elastic moduli tensor. The reservoir is usually considered as transversely isotropic medium with an axis of symmetry inclined at some angle to borehole axis. The elastic moduli tensor of such medium is determined by five components. At present, the method of analyzing sonic logging data based on the semi-analytical finite element method (SAFE) is being actively developed. This technique belongs to the class of variational methods and is based on the reduction of three-dimensional problem to two-dimensional ones. The main difficulties arising in the calculation of dispersion curves of borehole modes is the appearance of a large number of eigenmodes, only a small part of which occurs in reality. In this regard, the problem of modes classification naturally arises. In this paper the approach to solving this problem is proposed, which is based on the analysis of radial and spatial distributions of kinetic energy density of eigenfunction, its symmetry class and its polarization.
-
-
-
The Investigation of Multiple Waves in Models with an Ice Field in the Arctic Region with the Help of the Grid-Characteristic Method
Authors P.V. Stognii, I.B. Petrov, V.I. Golubev and A.V. ShevchenkoSummaryThe Arctic region exploration of oil deposits is difficult because of the presence of different ice constuctions. The seismograms, analysed after the seismic exploration of the region, are full of multiple waves, coming, as supposed, from these ice constructions. In this work, we study the influence of the ice field on the seismograms and on the wave fields. We analyze the way of removing the x-components of the seismic waves in the ice field with the help of a bad-conductive material. The results of modelling depict no improvement. Then, we model the multiple waves in the water layer. The wave fields and seismograms for this case perform the strong influence of the seismic waves on the results.
-
-
-
Decision Making Practice of Applying Electromagnetic Surveys in Different Geological Areas and Geophysical Conditions
Authors P.Y. Mostovoy, O.V. Tokareva, G.S. Grigorev, V.V. Gomulsky and Z.Y. ShobohonovaSummaryThe paper describes a decision making practice of TEM (transient electromagnetic method) survey application that is based on science reasoning and allow to do a rapid estimation of TEM method possibilities in different geological areas. The outcome of this investigation is a matrix of TEM application. The real examples of TEM application for exploration planning and the whole estimation cycle of TEM value and applicability are considered.
-
-
-
3D Geological Modelling of Vendian Terrigeneous Reservoirs Based on Inversion Data to Support Exploration Activities
Authors P.Y. Mostovoy and A.A. RodinSummaryThe article describes the approach and tools of geological modelling of vendian terrigeneous reservoirs in East Siberia including: lithology modelling using inversion data, uncertainty analysis, STOIIP estimation that are rapid and accurate enough for exploration aims.
-
-
-
Ghost Wave attenuation and its Place in the Workflow
Authors V.V. Tikhacheva, M.V. Aleshkin, V.V. Lantsev and N.A. StepanovSummaryGhost wave attenuation is becoming an essential part of every survey. From the ghost wave development it can be said that deghosting should be placed at the very beginning of the workflow. Here is an analysis of seismic signal with different placement of deghosting procedure. To show the signal changes on each step of data processing and identify better place for deghosting. Moreover, it is essential to perform deghosting on data to balance low frequencies in data amplitude spectrum to identify deeper horizons.
-
-
-
The Using of 3D Modeling for Processing Gravimetric Data in the Study of Oil and Gas Deposits of the Pre-Jurassic Complex of Western Siberia
Authors V.P. Merkulov, A.A. Volkova and G.S. GrigorievSummaryThe article deals with the problems of using 3D modeling for processing gravimetric data when studying oil and gas perspective deposits of the pre-Jurassic complex in Western Siberia. The three-dimensional model of the geological section is built on the basis of materials of three-dimensional seismic exploration and well logging. On the basis of layered geological reduction of gravity data, taking into account the density heterogeneity of the cover, the separation of anomalous fields from the pre-Jurassic complex and sedimentary cover.
-
-
-
Geometry of Geological Bodies and the Forecast of the Effective Thickness of the Clinoform Complex of the Achimov Sequence in the Context of the Actual Limitations of Seismic Data
Authors L.M. Akhmetova and L.A. GuryevskikhSummaryA detailed study of the geological structure of the clinoform complex is impossible without the use of the full complex of data: core, GIS, seismic surveys, regional conceptual schemes. This article discusses possible methods for solving the difficulties in determining the boundaries of geological bodies and predicting the effective thickness of the clinoform complex of Achimov deposits associated with limitations of research methods.
-
-
-
NMR study of Clay Clayed Hydrate-Containing Samples
Authors E.S. Chernova, M.Y. Shumskayte, V.N. Glinskikh and A.Y. ManakovSummaryA model of synthetic hydrates in a mixture of quartz pellets with kaolin clay is considered using by tetrahydrofuran solution based on distilled water and heavy water. The dissociation of tetrahydrofuran is investigated under atmospheric pressure. The analysis of the NMR-characteristics of tetrahydrofuran hydrate in a clayed sand is performed. The stages of hydrate dissociation excluding water contribution are established and it is shown that the NMR-relaxometry method is sensitive to the clay content. The obtained results allow us to simulate the processes of hydrate formation in real rocks and study their physical characteristics.
-
-
-
nSeis Spectral Decomposition. Qualitative Analysis of Restored High Frequencies Wavefield in Case of 3D Seismic Data
Authors A.A. Arkhipov and V.S. TyrichevSummaryAuthors represents a continuation of main company research stream in non-linear effects in seismic and some of calculated results. This time with simple example of high frequency wavefield restoration before spectral decomposition procedure in comparison with conventional seismic data processing.
-
-
-
Lithological Typification of Carbonate Sediments of the Non-Permian Department of the Platform Part and the Pre-Ural Deflection of the Territory of the Republic of Bashkortostan
Authors G.R. Khannanova and G.F. BaiburinaSummaryThe aim of the work was lithological typification, the identification of secondary transformations, the release of the hollow space of the Lower Permian carbonate stratum. The research area was the entire platform part and the Pre-Ural trough of the territory of the Republic of Bashkortostan. From the point of view of regional conditions, the Permian period of development within the territory of Bashkortostan was entirely under the dominant influence of the forming Ural mountain system. Terrigenous rocks were deposited to the west of the forming Urals. Clay-carbonate deposits of the depression facies were accumulated in the central part of the trough. To the west of the deep-water zone, within the platform part of the republic, there was a shallow epicontinental basin; his slow slow deflection of the bottom was compensated by the accumulation of carbonate organogenic detrital and chemogenic sediments. In the zone of mutual transition between platform and depressed facies an onboard sedimentary ledge was formed. Powerful organogenic structures, which originated at the beginning of the Asselsky century, actively grew on it.
-
-
-
Machine Learning Methods for Interpretation of Multidimensional Geophysical Data
Authors M.I. Shimelevich, Е.А. Obornev, I.E. Obornev and E.A. RodionovSummaryThe task of building a geoelectric profile based on geophysical fields measured on the surface can be compared with the task of recognizing an object based on its quantitative characteristics. For example, a face can be recognized by the numerical values characterizing the geometry of its constituent parts. In our case, the role of these quantitative characteristics is played by the measured values of the electromagnetic field, and the restored image is the geoelectric section in the color legend, where the color corresponds to a certain value of the specific resistance of the medium. Approximate neural network methods of geophysics are based on the construction of an approximate inverse problem operator in a given class of media using a multilayered neural network - a neural network approximator (NNA). For the construction of the NNA, the problem of its training is solved, which lies in the fact that the coefficients of the NNA are adjusted by the training sample of known solutions of direct problems obtained using the direct operator of the problem being solved. The task of adjusting the coefficients of the approximator is reduced to an optimization problem, which is solved using the methods of the Monte Carlo group.
-
-
-
Geological Model Building via the Spectral Inversion
Authors V.A. Fagereva, P.P. Emelyanov, A.V. Butorin and F.V. KrasnovSummaryIn this paper, we consider the method of acoustic impedance restoration, based on the spectral inversion of the wave field taking into account the low-frequency model and its further use in building the geological model.
-
-
-
Petroleum Potential of the Paleozoic of the Northern Part of Srednevasyugan Megaswell (Tomsk Region)
Authors M.V. Solovev, V.A. Kontorovich, A.Y. Kalinin and L.M. KalininaSummaryThe paper discusses the features of the Paleozoic deposits geological structure of the northern part of Srednevasyugan megaswell located in the south-east of Western Siberia. A map of the material composition of the pre-Jurassic basement rocks was constructed. The difficulties of searching for Paleozoic collectors are described. Low-contrast blocks of carbonate rocks that are of greatest interest in relation to petroleum potential are identified. These blocks are characterized by reduced seismic recording amplitudes and are limited to Jurassic faults.
-
-
-
Geological Modeling of the Field of the Caspian Basin, Complicated by Dome-Salt Tectonics
Authors I.S. Gutman, G.N. Potemkin, P.S. Biktagirova, S.A. Rudnev and I.G. Il’dzhirinovSummaryThe basis of the work is the refinement of the geological structure of the Sovkhoznoye field, complicated by salt-dome tectonics. As a result of the work, the geological and tectonic structure of the Sovkhoznoye deposit is refined. Based on logging data, field geophysical studies, a detailed correlation of well sections was performed. Based on it, productive formations have been allocated and the reservoir has been geometrized. A geological model of a gas deposit of the Sovkhoznoye field has been created, taking into account the peculiarities of salt-dome tectonics. An assessment of the geological heterogeneity of the reservoir. Based on the updated geological model, recommendations for further efficient development of the field are proposed.
-
-
-
Quantitative Analysis of Whole Core Images
Authors I.A. Seleznev, V. Abashkin, A. Chertova, S.B. Istomin, A.F. Samokhvalov and D. RomanovSummaryThis paper describes a workflow for automatic processing of whole core images that enables macroscopic description of the rock layers constituting the studied geological section. The method makes it possible to detect core properties descriptors including, rock color characteristics, texture, layering inclination and thickness, and the shape and size of clastic inclusions. The method includes procedures for the detection of layering via convolution transformation of the image, clastic inclusions detection and characterization using watershed via segmentation procedures, processing color/intensity analysis, cluster analysis using normalized color/intensity data of a given image zone, and other image processing and analysis procedures, which enables obtaining any information for characterizing core samples. The parameters can be selected automatically or set manually. They depend on the particular task and target scale. Both normalizing daylight and UV images of core can be used. Clustering enables automatic detection and filtering of zones of photographs that are filled with organic spacers, heavily fractured material, or zones filled with organic matter. Processing results for terrigenous and carbonaceous whole core images are presented in the paper. The results are compared with petrophysical analysis of the rock material and profiling of the physical properties of the whole core materials.
-
-
-
Interrelation Between the Structure of the Earth’s Crust and Upper Mantle and the Maturity of Source Rocks
Authors I.N. Ognev and D.K. NourgalievSummaryThis work is aimed at studying the interrelation between the structure of the Earth’s crust and upper mantle and the maturity of source rocks based on modern satellite gravity data. Here, considering recent studies, we propose to use GOCE gravity field models for a gravity field inversion in order to define Moho depth on Volga-Ural oil and gas-bearing province. This will allow us to construct more precise heat flow models and consequently maturity maps of higher accuracy for this region. Volga-Ural oil and gas bearing province is a good region for the goal of this study because it is well surveyed geologically and geophysically. Moreover, it has gotraverse “TATSEIS-2003” where Moho boundary is defined, so the final crustal Model can be calibrated using these data. Besides, there is still a controversy in terms of mechanisms of maturation and migration of oil from Domanic source rocks in such big deposits as Romashkino, so there is a need for further investigation of this region through basin modelling. All the available and needed data as well as a proposed workflow for gravity field inversion are discussed in this study.
-
-
-
A Study Into the Depositional Environments of East Arctic Sedimentary Basins Aimed at Evaluating their Hydrocarbon Potential
Authors G.A. Zavarzina, D.S. Shapabaeva and O.A. ZakharovaSummaryAt a stage of regional geological studies, the key problems to be solved when predicting the hydrocarbon potential of the East Arctic sedimentary basins are to estimate the main parameters of the sedimentary cover, namely to identify major depositional seismic sequences, assess their thickness, reconstruct depositional environments and predict seismic facies. By reconstructing paleodepositional environments in which sedimentary sequences were laid down, we will be able to evaluate the region’s hydrocarbon potential and to define a strategy for planning further geological exploration on the continental shelf.
-
-
-
The Results of Monitoring of Hydrocarbon Traps of the Terrigenous Vendian Complex of the Eastern Part of the Baikit Petroleum Region
By V.V. SerovSummaryThe results of the working reports and published articles were reviewed. The main idea of the article shows is to show a change in the structure of hydrocarbon traps. It is believed that hydrocarbon traps are the main objects of study in oil and gas geology. Particular attention is paid to the reliability of the mapping of hydrocarbon traps.
-
-
-
Illumination Analysis for 3D Survey Design Over Complex Paleozoic Structures: Tomsk Region Case Study
SummaryPre-Jurassic complex is one of the objects for expanding the resource base of Tomsk region. The theoretical foundations of seismic and the complex geological situation determine the ambiguity of the results of recording and processing seismic data. One of the main ways to increase the reliability and uniqueness of decisions, identify possible risks during field investigations is the direct modeling method based on real geological models. Ray trace modeling has been applied for evaluation of the optimality of the shooting scheme. The result of ray tracing is the illumination maps, which show the actual fold along target horizon and effect of the velocity model, the structure and recording geometry. An analysis of a wide range of ray attributes for the generated synthetic recording systems, the results of finite-difference modeling made it possible to make recommendations on the optimal acquisition system providing the best illumination of the studied formation, which consist in limiting the distances to no more than 7 km, receiver line distance – 200 m, shot line distance – 200 m, bin size 25×25 m.
-
-
-
Basic Assumptions for the Pre-Aptian Deposits Mapping on the East-Siberian Sea Shelf
SummaryNow the East Siberian Sea is one of the least explored by geological methods seas in the Russian Arctic. But in recent years the work carried out by PJSC Rosneft Oil Company allowed to obtain fundamentally new data about the evolution of the East Siberian Sea sedimentary cover and its depositional conditions that are directly related with hydrocarbon prospectivity of the region.
-
-
-
Multi-Azimuth Depth Imaging of Marine Surveys
Authors O. Litvyakova, A. Sakharov, A. Welbon, A. Bodrov, A. Korolev, B. Esinov and E. BeSummaryMulti-azimuth depth imaging - Norwegian sea case study.
-
-
-
Numerical Simulation of Non-Stationary Fluid Filtration in a Digital Model of a Synthetic Porous Medium
Authors E.A. Marfin, A.A. Abdrashitov, D.V. Chachkov and M.A. VasilevaSummaryThe paper studies the influence of superimposed oscillations on the flow of a liquid in a porous medium. The object of the study is a three-dimensional pore space, obtained by the results of Х-ray microtomography of a synthetic porous medium. Physically, models of porous samples are created from microscopic glass beads by sintering in a muffle furnace. The flow of fluid in the pore space is described by the continuity and Navier-Stokes equations. Computer modeling was carried out for both stationary flow and flow with superimposed oscillations. The regularities of the flow and the influence of superimposed vibrations on them are determined. The obtained data can be used to improve the methods of wave action on productive formations for oil production.
-
-
-
Search and Prediction of Reservoirs in the Pre-Jurassic Rock Complex
Authors A.I. Evdokimova and A.V. BobrovSummaryThis work, performed on the basis integrated interpretation of seismic exploration and deep drilling data. Deals with the analysis of the geological structure and petroleum potential pre-Jurassic deposits Luginetsk field with objective search deposit petroleum.
-
-
-
Determination of Oil Samples Viscosity and Group Composition by Geochemical and NMR Data Complex Interpretation
Authors E.S. Chernova, M.Y. Shumskaite, A.I. Burukhina, V.N. Glinskikh and E.A. FursenkoSummaryThe paper presents the results of NMR studies of oil samples and its fractions at the different temperature. The group analysis of the samples has been carried out by NMR data, which is consistent with the geochemical analysis data. Viscosity was estimated by NMR data in gradient magnetic field. It was established the dependence of the transverse relaxation time on the content of resinous-asphalting compounds at different temperature.
-
-
-
Gas Hydrates Potential of the Arctic, Northern Atlantic and Pacific Oceans
Authors V.I. Bogoyavlensky, A.V. Kishankov, A.S. Yanchevskaya and I.V. BogoyavlenskySummaryThe Arctic Ocean and adjacent offshore areas contain giant resources of gas hydrates (GH) – solid compounds, formed as a result of interaction of gas and water at enhanced pressures and decreased temperatures. GH have much more gas resources in comparison with conventional fields, and they are considered the energy sources of future. However, GH are dangerous for exploration and production of conventional fields and other activities in the Arctic. Changing of thermobaric conditions in the upper part of sedimentary cover during well drilling in areas of GH distribution can cause their dissociation, which may lead to accidents and disasters. Moreover, emission of gas from GH into atmosphere plays a significant role in climate change on the Earth. The objective of this research was the forecast of GH distribution zones in the Arctic Ocean and adjacent northern areas of the Pacific and Atlantic oceans from 45 to 90°N. On basis of data of NOAA, near-bottom water temperatures in the studied megaregion were analyzed. Minimum depths suitable for methane hydrates (MH) existence at different temperatures were calculated, using CSMHYD software. Also numerous CDP seismic sections were analyzed, and revealed BSRs appeared to be within the forecasted zone of MH distribution.
-
-
-
Well Trajectories Optimization in the Three-Dimensional Hydrodynamic Model
Authors L.I. Akmadieva, S.D. Ilichev and A.S. AsylgareevSummaryAsset value depends on the choice of the optimal development system. In conditions of hard-to-recover reserves, three-dimensional hydrodynamic modeling is an integral part of the development design. Trajectory of a horizontal well is a critical parameter in assessing production potential. The high labor costs often lead to the fact that developers neglect to perform a detailed assessment of the development systems. This can lead to incorrect design decisions. it is required to develop a tool that allows you to automatically create realistic well trajectories and generate predictive options for calculation that exclude deliberately non-optimal well trajectories in the reservoir. Our tool choose the technologically achievable optimal well trajectories, taking into account the restrictions on the angle set during drilling.
-
-
-
Prognosis of Carbonate Reservoirs of the Technology of Separation of Scattered Waves using the Method of Gaussian Beams
Authors D.A. Petrov, A.A. Melnik, V.V. Shilikov, M.I. Protasov and V.A. CheverdaSummaryAn approach to innovative method for the extraction of scattered waves, developed by OOO RN-KrasnoyarskNIPIneft, using the method of Gaussian beams to detect fractured-cavernous reservoirs and faults. Gaussian beams are a new round in the development of techniques using scattered waves. The new technology has a high and uniform resolving power, which will allow obtaining accurate diffraction images of the fine structure of fractured-cavernous reservoirs.
-
-
-
Substantiation of the Geological Model for the Successful Development of Deposits on the Example of One of the Fields SN-MNG
Authors K.V. Egorova and L.A. GurievskikhSummaryhe report describes the creation of a 3D geological model taking into account facies heterogeneity. Seismic and core data were analyzed in the study. As a result, the correct variogram rank would be chosen to predict reservoir properties and a clay line would be drawn.
-
-
-
Features of the Geological Structure of Gas Deposits in the Carbonate Strata of the Yamal Peninsula
Authors A.V. Beltikov and T.S. MalyshevskayaSummaryThe pre-Jurassic folded base of the Paleozoic Deposit is dated on the basis of paleontological and palinological studies with a time range from the Cambrian to the Carboniferous. On the studied area, the Megacomplex is structurally a broad deflection - rift eroded at the edges, subsequently filled with carbonate strata. Stratigraphically, the Megacomplex can be divided into two unequal floors: the weathering crust and the metamorphosed dislocated base. Lithologically, Megacomplex rocks are represented by marbled limestones, marls, dolomites, peridotites, gray and green shales. Analysis of core material showed that reservoirs are porous limestones terminowe largely dolomitized According to 3D seismic data revealed 388 faults belonging to the three main types, as well as 5 inclined boundaries with disagreement adjacent to the roof of the pre-Jurassic base. Gas deposits are trapped tectono-stratigraphic type.
-
-
-
The Updated Model of Paleozoic Reservoirs in the North-West of the Timan-Pechora Province Based on the Results of Recent Geological Exploration
Authors O.M. Prishchepa, E.I. Grokhotov, A.N. Pestova and S.E. BashkovaSummaryStudies of the structure of the pore space of the northwestern part of the Timan-Pechora oil and gas province based on the results of the exploration in the period 2013–2018, provide an opportunity to assess its reservoir potential. In previous years, regional seismic surveys were carried out within the Izhma-Pechora depression and in adjacent territories, and a parametric North-Novoborskaya well was drilled with core sampling, which was investigated by litho-petrographic and biostratigraphic methods. Based on the implementation of a complex of laboratory and analytical studies, taking into account the results of seismic interpretation, the model of the structure of the pore space of the Paleozoic sediments was refined. According to the lithological composition, two types of reservoirs are established in the sediments - clastic and carbonate.
-
-
-
Using Pyrolysis for the Reservoir Properties Assessment of Low-Permeability Carbonate Formation
Authors E.A. Vtorushina, M.N. Vtorushin and T.D. BulatovSummaryThe organic matter characteristics are obtained and oil-saturated intervals are identified in the sections of low-permeability carbonate formation based on pyrolysis data using rock analyzer HAWK Resource Workstation. Depth distribution of pyrolysis parameters in wells – thermally freed hydrocarbons (S0+S1), kerogen (S2), Tmax, Total Organic Carbon (TOC), Production Index (PI), Oil Saturated Index (OSI) and Hydrogen Index (HI) are investigated. It has been shown that the thermal maturity of organic matter of the most samples comes to “oil window” zone. The kerogen is mainly of Type II. According to pyrolysis data the distinguished features of the reservoir rocks are increased PI values, OSI > 100 mg HC/g rock and significant S2 peak decreasing (more than 50%) after extraction that indicates the allochthonous bitumoids.
-
-
-
Effect of Pore Space Structure on Lythotypes Wettability in Upper-Devonian Formation of Timan-Pechora Province
Authors S.A. Borisenko, P.V. Koshkin and S.Y. RudakovskayaSummaryComprehensive studies of the carbonate reservoir rocks wettability in compliance with a pore space structure were done. Research complex involved NMR with deuterium oxide saturation, USBM, mercury injection, computer tomography, image-analysis of thin sections. Influence of different pore-size groups on lythotypes wettability was determined.
-