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Geomodel 2021
- Conference date: September 6-10, 2021
- Location: Gelendzhik, Russia / Online
- Published: 06 September 2021
1 - 20 of 123 results
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Use of Wavefield Extrapolation for Seismic Ghost Elimination
By M.S. DenisovSummaryA wavefield extrapolation-based method to eliminate the seismic ghost reflection on marine data acquired with arbitrary towed streamer geometry is proposed. A model of the receiver-side ghost is obtained from the basic concepts of the wavefield extrapolation theory. The algorithm is implemented in the spectrum domain and implies solution of a set of linear equations at each frequency. Real data examples are shown.
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Fracture Characterization Via Diffraction Image Attributes
More LessSummaryThe paper presents an approach for the recovery of discrete fracture modeling parameters. It combines diffraction imaging, topological analysis of the diffraction images, and scattering indicatrix analysis. Here a pre-stack partial depth-migrated image containing wavefield from different spatial directions produces additional reliable information in terms of the scattering indicatrix attributes. The topological analysis is the 3D image processing algorithm based on the behavior of different diffraction amplitude levels. The results of the topological analysis of diffraction images are complemented by the scattering indicatrix attributes. The numerical results on the synthetic and real data demonstrate the approach’s possibilities for fracture reconstruction and characterization.
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Modeling The Processes of Hydrophobization of Rocks of Various Compositions in a Thermogradient Field
By M.Yu. ZubkovSummaryThe results of experiments on the hydrophobization of bentonite, quartz and carbonate powder saturated with three types of oil and/or an oil-water mixture in a thermal gradient field are considered. It was found that the hydrophobization of the samples occurs only in the presence of water and only with oil rich in porphyrins. Hydrophobization of alumosilicates occurs due to the sorption of dark-colored components (hetero compounds) on their surface, and the surface of carbonates is hydrophobized by light-colored components. It is assumed that the hydrophobization processes are activated due to the action of hydrothermal fluids.
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Estimation of Value of Closed Porosity Formed in Ideal and Non-Ideal Granular Reservoirs in The Process of Their Compaction
By M.Yu. ZubkovSummaryThe results of modeling the processes of compaction of ideal and non-ideal reservoirs are considered, the value of the closed porosity formed in different types of reservoirs is estimated, and explanations are given for the observed differences in the compaction of these types of reservoirs.
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Hydrocarbon Systems and Assessment of The Probability of Discovery of Oil and Gas Accumulations in The Bering Sea
Authors B.V. Senin, S.A. Guryanov, V.Yu. Kerimov and E.A. LavrenovaSummaryTo study the hydrocarbon systems, geochemical and lithological studies were carried out and modeling technologies were used using Schlumberger “PetroMod” software systems, small-scale modeling of sedimentary basins of this region and their hydrocarbon systems was carried out. As a result of research and modeling, a forecast of the distribution of potentially non-gas source strata of the Paleogene and Neogene was made. The prognosis of the OM maturity levels of the oil and gas source strata of the Anadyr oil and gas region, carried out in the process of modeling hydrocarbon systems, based on the results of studying the reservoir temperatures and the reflectivity of vitrinite in the wells of its mainland, showed that in the most curved sections (basins) of the sedimentary basin of the same name, all potential oil and gas source strata have reached sufficient maturity for the generation of hydrocarbons. At the same time, the degree of OM catagenesis in the Eocene-Oligocene oil and gas source strata generally does not exceed the stages of predominant generation of liquid hydrocarbons. At the same time, the potential oil and gas source strata of the Miocene reached the level of the oil window in relatively small areas of the oil and gas bearing region. In general, the most bowed sections (hollows) of the Anadyr sedimentary basin, in which mature oil and gas source deposits are located, can be considered as potential sources of hydrocarbon generation.
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Hydrocarbon Systems and Assessment of The Probability of Discovery of Oil and Gas Accumulations in The Tatar Strait of The Sea of Japan
Authors B.V. Senin, V.Yu. Kerimov and S.A. GuryanovSummaryNumerical basin modeling of the Tatar Strait of the Sea of Japan of the Tatar oil and gas region made it possible to identify up to 10 generation-accumulation hydrocarbon systems, represented to varying degrees in four stratigraphic intervals: Eocene-Oligocene, Oligocene-Miocene, Middle-Upper Miocene and Upper Miocene. Eocene-Oligocene hydrocarbon systems occupy the largest area of the Tatar oil and gas bearing area and include large foci of oil and gas generation. The largest focus is associated with the South Tatar hydrocarbon system, the level of maturity of organic matter (OM), which corresponds to the “gas window” or exceeds it. The largest hydrocarbon systems of the Oligocene-Lower Miocene (Uglegorsk) interval are the North Tatar, Central Japan and South Tatar. In most of the areas occupied by them, the maturity of organic matter corresponds to the stage of predominant gas generation. The generation, migration and accumulation of hydrocarbons in the hydrocarbon systems of this interval began in the period from the end of the Early Miocene to the middle - second half of the Middle Miocene. The hydrocarbon systems of the Middle-Upper Miocene - Uglegorsk-Kurasian and Kurasi-Maruyamsky, in accordance with the modeling results, were formed in the conditions of a gradually deepening sea basin. The processes of generation, migration and accumulation of hydrocarbons in these systems began locally in the middle of the Miocene, and in main volumes - at the boundary of the Miocene and Pliocene, or somewhat later.
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East Arctic Offshore Petroleum Systems Analysis
Authors E.A. Lavrenova, V.Yu. Kerimov, R.A. Mamedov and Yu.V. ShcherbinaSummaryRussian is expected to contain significant amounts of hydrocarbons. The upper part of the sediment cover here consists of a Cenozoic prograding wedge underexplored due to its complicated structure. At the same time, Beaufort-Mackenzie basin synchronic sediment units contain hydrocarbons. There are several gas discoveries: Mauligak, Kopanoar, Naglu. Seismic data accused in the East Siberian sea reveal frequent shifting of depositional settings, various sediment transport directions, and tectonic activity in the region. Seismic images show combined reflector’s patterns (sigmoid, oblique, etc.) and their low lateral continuity. It causes difficulties in seismic interpretation and overall prospect assessment. Investigation of hypothetical Cenozoic petroleum systems and assessment of hydrocarbons potential of Cenozoic depositional units is the main objective of our study.
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Intra-Layer’s Pressure Regimes and Reservoir Properties of The VII Horizon within SDKhZ Field in Azerbaijan
By A.B. HasanovSummaryFrom built models follows that the vector direction of the measured initial reservoir pressures along the VII horizon quite organically fits into the structure of the field and illustrates the spatial continuity of the initial reservoir pressure field. It is noteworthy that, despite the presence of longitudinal and transverse deep faults, there is no noticeable distortion of the vector direction of the initial reservoir pressures (at least within the limits of horizon VII). At the same time, the model shows the dominance of the distribution of the initial reservoir pressures from the roof to the peripheral parts of the field structure. This fact, taking into account the features obtained earlier and should be taken into account by water flooding of productive horizons at the stage of additional development of residual hydrocarbon reserves.
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Estimation of Oil-Gas Reservoirs Capacity at Great Depths Using Fuzzy Linear Regressions
Authors A.B. Hasanov and M.S. IbrahimliSummaryThe recognition of productive horizons within of oil and gas deposits is based on assessments of reservoir’s filtration-capacitance properties, the values of which determine the nature of pore space and fluid saturation. Usually variability of reservoir’s filtration-capacitance properties prognisis by 2D and 3D petrophysical models which reflect results of well logging and core lab investigations. At the same time, considering that natural reservoirs are characterized by a multitude of parameters, such as tortuosity and the shape of the cross section of pore channels, the thickness of the layer of bound water, etc., which cannot be strictly determined thru laboratory. In this reason petrophysical models based only on core researching cannot be accepted as flawless. Another major problem in petrophysical modeling is the effect of scattering of experimental data in the phase space of parameters, which inexplicable as errors of calculations or measurements. As a try to avoid the above problems, more appropriate is fuzzy petrophysical models which is the most optimal, from the point of view of the representation of the polygons scattering experimental data and phase space parameters. Key words: deep-lying sediments, petrophysical models, productive reservoirs, fuzzy values, predicting the reliability, fuzzy logic-based method.
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Building a Depth-Velocity Model Based on Electrical Prospecting Data Using VSP Data and Sonic Logging
Authors N.T. Ibragimova, V.V. Kasyanov and S.A. CherkashinSummaryIn recent years, PAO Gazprom has significantly increased the volume of electrical exploration work. Variants of TSS technologies (sounding by the formation of a field in the near zone) with different sizes of generator loops provide a depth of research up to 1-4 km, which allows solving problems related to the search for oil and gas, studying the geological structure of the sedimentary cover, forecasting reservoirs, faults, identifying decompaction zones. When constructing the depth-velocity model, the final materials of electrical exploration (cube of electrical resistivity) were used, obtained in the southern part of the Bovanenkovskoye field by the ZSB method, VSP data (vertical seismic profiling) and acoustic logging in a well drilled within the study area. With the aim of using electrical prospecting data to build a depth-velocity model, the authors carried out various options for calculating and converting the resistance cube to the longitudinal wave velocity cube. As a result of numerous studies, a method of work was developed that allows using electrical prospecting data with sufficient accuracy to calculate the velocity characteristics of the environment. The authors obtained and analyzed cubes of interval velocities, rock density, Young’s modulus of elastic deformation, calculated using the above method.
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Upper Devonian River Deltas - Perspective Exploration Play Around South-East of The Volga-Ural Province
Authors Y.I. Nikitin and R.Kh. MakhmudovaSummaryAround south-east of the Volga-Ural Province in was determined that that the Upper Frasnian oil-bearing sandstones of the Vakhitov field have river delta origin by a sedimentological analysis of core. Two stratigraphic pools are placed in delta bars and delta branches, from one of them flow oil ratio were reached 500 tpd in wells. Delta sandstones contained 70% of initial recoverable reserves and provided 60% of oil production on the large Vakhitov Field. Nearby the Upper Frasnian river delta another, the Lower Famenian, river delta has been predicted by 3D seismic and well drilling data. Tectonic and paleogeographic investigations allow to propose once more perspective Upper Devonian river deltas eastward Vakhitov Field, over Ural Foredeep till Ural Folded Belt.
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Results of Modeling the Processes of Generation, Migration and Accumulation of Hydrocarbons in The Eastern Part of The Scythian Plate
Authors R.N. Mustaev, V.Yu. Kerimov and N.Sh. YandarbievSummaryThe main spatio-temporal regularities of the development of the processes of generation, migration and accumulation of hydrocarbon fluids in the eastern part of the Scythian plate were established and the features of the generation-accumulation hydrocarbon systems of the northern part - Karpinsko-Mangyshlak and East Ciscaucasia oil and gas regions based on the application of technologies of basin analysis and modeling of hydrocarbon systems were studied. ... Five hydrocarbon systems are distinguished in the sedimentary cover of the eastern part of the Scythian plate: Jurassic, Cretaceous, Paleocene-Eocene, and Oligocene-Miocene systems. Modeling of hydrocarbon systems for the territories of the eastern part of the Scythian plate was carried out according to the regional seismic profile crossing tectonic elements in the eastern part of the Scythian plate using the Temis Suite software package. For the considered oil source strata, kinetic schemes of activation energy distribution were determined on which the time and rate of decomposition of kerogen and the formation of hydrocarbons from it depend. Based on the results of system modeling, the main directions of further prospecting and exploration work in the eastern part of the Scythian plate have been determined.
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Effective Well Diagnostics for Production Optimization
SummaryHistorically the Client (Gazpromneft) used standard logging technology with the temperature modelling for the interpretation since no direct measurements could be acquired and was getting inconclusive answers for well production performance and it did not allow them to take effective decisions for both production optimization of a particular well and further wells drilling in their fields. We offered our technologies specifically designed for horizonal wells and our expertise to address these challenges. The unique collaboration with the Client-related logging company (Gazpromneft-Noyabrskneftegazgeofizika Ltd.) and other 3rd party companies (Novomet Y-tool) was done to put all pieces of the puzzle together to conduct the necessary services. Production Logging campaign in total 12 wells was successfully held at two fields in Siberia (Novoportovskoye and Vostochno-Messoyakhskoye) in 2020. Optimal logging programs were prepared for this PLT campaign, considering peculiarity of each well. The conveyance of tools to zones of interest was done using both types of our downhole tractors (MaxTRAC and a new generation TuffTRAC-IX). The campaign was carried out with the real time continuous support to quickly adapt a logging program for specific downhole conditions to ensure full answers.
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The Oil and Gas Potential Prospects of The Paleozoic-Mesozoic Deposits in The Junction Zone of The Yamal, Gydan and Nadym-Pursk Oil and Gas Regions of Western Siberia According to 2D, 3D Seismic Data
Authors V.N. Borodkin, O.A. Smirnov, A.V. Lukashov, A.G. Plavnik, M.V. Komgort and A.A. TeplyakovSummaryThe seismogeological characteristics of the Paleozoic, Triassic, Jurassic and Neocomian formations are presented. On the basis of 3D seismic survey in the section of each complex, promising hydrocarbon traps are identified for conducting search and evaluation work
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On Problems of Automatical Extraction and Selection of Various Lineament Systems on Fractured Geological Medium Images
Authors V.V. Masjukov and O.S. YurchenkoSummaryCurrently, deterministic, stochastic, and neural network algorithms for detection and enhancement lineament features in images of a fractured geological medium are included in almost all state-of-the-art software for geological and geophysical information interpretation. The visible fractured in the images are often a combination of several systems of fractures that differ morphologically and genetically, and in their filtration properties as well. The identification and detection of these systems for the zonal interpretation of lineament images is an ambiguous and complex interpretation task. Using DFN (Discreet Fracture Network) for a geological modeling is now an extremely simplified approach, since it does not allow to differentiate objects of this network (DFN) flexibly enough depending on their properties, to carry out their zonal interpretation in volume, etc. Therefore, now, both for ore and oil geology, it is relevant to study and develop algorithms for automatic selection of various systems of lineaments (systems of fractures) on images of the fractured medium. This paper is devoted to the discussion of the problem statement and the main directions of solving this problem on the base of multi-scaled methods [Masjukov, Yurchenko, 2019, 2020].
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Hydrogeological Settings and Petroleum Potential of The Jurassic-Cretaceous Deposits of The West Siberian Basin Karabash Zone
Authors A.G. Plavnik and M.V. ItskovichSummaryThe paper presents analysis of geo-temperature, hydrodynamic and hydrogeochemical data in comparison with the complex results of geological, geophysical, paleontological, geochemical and other studies in assessment of the petroleum potential of Mesozoic sediments in the Karabash zone. The results obtained indicate a low efficiency of the traditional hydrogeological criteria application for the zone under consideration, due to the unevenness of the deposits study, small ranges of changes in hydrogeological indicators and the use of many different criteria. Under these conditions, the task of developing methods for a comprehensive analysis of all hydrogeological data becomes urgent.
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Automated Identification of Well Production Dynamics and Data Assimilation
Authors A. Gryzlov, S. Safonov, E. Magadeev and M. ArsalanSummaryTraditional reservoir and production engineering methods are based on mathematical modeling of multiphase flow in an area constrained by the petroleum oilfield region and a number of wells. These transport phenomena are governed by a series of partial differential equations (PDEs) describing the conservation of mass, momentum, and energy formulated for each considered phase. The use of modern computational methods ensures that simulating a hydrocarbon system provides an accurate prediction of flow variables, which is only valid if the underlying models are perfect. Since any model is only an approximation of reality, the results of numerical modeling tend to deviate with time and hinder proper decision-making related to field development and management. An alternative method is proposed, which identifies the general form of governing equations using transient data, which are collected over a certain time interval in a discrete number of measurement locations. The obtained equations are then refined using traditional data assimilation techniques. These two components are integrated into the universal modeling platform, where the equations governing multiphase flow and non-linear coefficient are obtained only from the data without any initial knowledge of system dynamics.
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Determination of The Angles of Inclination of The Reflecting Boundaries in The Seismic Survey MOGT-2D
Authors V. I. Bondarev, S. M. Krylatkov, N. A. Krylatkova and A. N. KrylovskayaSummaryThe authors have developed and patented a new method for obtaining the values of the angular characteristics of reflecting boundaries in the geological environment based on the analysis of the features of hodographs and records of reflected waves on seismograms collected asymmetrically relative to the common midpoint on the profiles or the area of research. On this basis, new possibilities and features of obtaining and using information about the angular characteristics of boundaries for obtaining objective seismic images of geological environments in the presence of steeply falling seismic boundaries in the section are considered. The solution of the above problems is carried out within the framework of the use of effective models of media, which leads, by analogy with the concept of effective velocity, to the need to introduce the concept of effective angles of inclination of reflecting boundaries. Methods for solving these problems are considered for the materials of seismic exploration by the method of multiple overlaps in the 2D version.
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Seismic survey method with vibroseis source
Authors D.B. Finikov and A.V. ShalashnikovSummaryThe report describes a seismic survey method with several significantly different sweep signals. This difference may lie in their duration at an identical frequency range. It is argued that under these conditions it is possible to identify the differences between the signals that actually went into the medium and the projected ones. Illustrations of the method on model examples are given.
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The Generalized Mathematical System of Representation and Processing of Geophysical Data Based on Combined Fourier-Hartley Transform and New Convolutional Basis «Fourier-Splines» Approach
More LessSummaryA new approach actual in seismic data processing and interpretation is performed. The essence of the method is continuous analytical function restoration from the initial discrete samples on the base of finite spline functions. It provides classical mathematical methods utilization possibility in digital data processing (differentiation, integrals calculation etc). Particularly precise interpolation becomes accessible (in 3D graphics it always was one of the main problem). The main difference is in initial discrete samples replacement by their decomposition coefficients (it’s amount may be even less). Finally signal may be restored in any point as convolution with spline function. In seismic data processing this method appeared to be the most simple and efficient due to sufficient data spectrum top border stability. The most simple and convenient spline functions on the base of short Fourier series were synthesized.
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