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Tyumen 2019
- Conference date: March 25-29, 2019
- Location: Tyumen, Russia
- Published: 25 March 2019
1 - 20 of 110 results
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Approaches to the Definition of Model Conditions in the Variational-Grid Method of Geomapping
By A. PlavnikSummaryThe paper deals with the problem of determining model conditions that correspond to experimental data on the geological objects properties, as applied to the variational-grid method of geomapping. The peculiarity of the problem lies in the fact that the model conditions are given in the form of partial differential equations, and it is necessary to define two or more such equations for determine the uniqueness of the solution. We propose an approach based on the definition of orthogonal hyperplanes in the multidimensional space of the first, second derivatives, and values of the function being mapped, which are most consistent with the available data. in the absence of experimental definitions of the values of the derivatives, an iterative method of their sequential refinement is proposed. The method was tested using examples of restoring model conditions corresponding to a series of periodic solutions. The problem mathematical formulation general nature and the possibility of optimizing the computational scheme determine the prospects of the approach considered for restoring model conditions in a wider class of functions.
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Clarification of the Geological Structure and Oil and Gas Geological Zoning of the North-Eastern Regions of the Siberian Platform
More LessSummaryThe 2D seismic data and drilling results has been analyzed for the North-Eastern regions of the Siberian platform. The stratigraphic range of sediments of the northern part of the Predverkhoyan foredeep has been clarified, geological and oil and gas-geological boundaries have been corrected within the marginal depressions of the Northeast of the Siberian Platform.
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Determining the Direction of the "Main Stress" on the Basis of Geomechanical and Paleomagnetic Studies of a Full- Sized Core
By M. ZubkovSummaryIt is proposed to determine the direction of the “main stress” based on the study of the deformation and acoustic properties of full-size core samples with its subsequent binding to the side of the world using the paleomagnetic method. The methodology of the experiments, the equipment used for this purpose, and the results obtained are described.
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Forecast of Perspective Oil and Gas Zones From Seismic Data and Experimental Tectonics
By M. ZubkovSummaryBased on the analysis of seismic data, the main types of anticlinal structures present in the sedimentary cover of the West Siberian oil and gas basin are established. Using the opticalpolarization and tectono-sedimentation methods, the modeling of the process of their formation was carried out. The mechanism of formation of zones of subsidence or decompression of sediments above growing elevations of various shapes is explained, the most likely areas of secondary tectonogenic fracturing in competent formations, including silicon-carbonate deposits of the Bazhen-Abalak complex, are identified
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Clustering Methods Stability Analysis of Seismic Traces in Forward Seismic Models Based on Geological Outcrop
Authors I. Churochkin, A. Volkova, V. Rukavishnikov, E. Fedorova, N. Bukhanov and A. ButorinSummaryCluster analysis based on the shape of seismic traces allows perform zonation of the field area, similar to the facial division. The project proposes to carry out research which includes the allocation of clusters relying on forward seismic models with different impulse frequency. in this way it will be possible to make a conclusion about influence of quality of seismic acquisition on zonation of the area of study. It is proposed to perform investigations on large scale field model based on proportions of fluvial deposits outcrop.
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The Need for Research and Systematization of Factors Determining the Formation of Non-Anticlinal Traps for Oil and Gas, in Order to Increase the Efficiency of Their Detection
Authors P.N. Strakhov, K.G. Skacing, Y.G. Eremin and V.I. PyryevSummaryThe increasing complexity of the hydrocarbon resource base structure determines the consistent increase in the urgency of the problem of identifying and developing non-anticlinal oil and gas deposits. in this regard, the agenda is the problem of studying the factors that control the formation of accumulations of oil and gas. The results of comprehensive studies of the developed deposits indicate the existence of limited connectivity between the sediments, the accumulation of which was carried out in various facies zones. in addition to sedimentation conditions, the possibility of formation of hydrodynamic barriers inside the reservoir determine the epigenetic transformations of rocks. The most frequently encountered phenomenon is recorded in carbonate sediments. in the stressed zones, intensive leaching of carbonate material occurs, which is deposited in the immediate environment, which negatively affects the movement of hydrocarbons within the natural reservoir. This creates favorable conditions for the formation of traps. This phenomenon, in some cases, contributes to the formation of non-conductive low-amplitude faults. The paper presents the typification of factors contributing to the creation of frontier deposits on a level with the structural plan.
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Methods of Reservoir Geochemistry in the Assessment of Flow Intervals in Multi-Layer Fields
Authors A.V. Ermolovsky, A.Y. Kuklinsky and N.N. PolskayaSummaryThis paper presents examples of applied and practical use of reservoir geochemistry methods that allow monitoring the development of the field, tracking the operating oil-saturated intervals during their joint operation, determining the contribution of each of the developed reservoir in the total hydrocarbon inflow.
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Petrophysical Model, as the Basis of the Litho-Facies Model for the Calculation of Reserves.
By E. ShevelevSummaryOne of the main problems in the complex carbonate sediments of the Pripyat Trough is the correct determination of the distribution of reservoir rocks in the interwell space. The need to build a correct reservoir distribution model in the volume of rocks is dictated by drilling a large number of directional and horizontal wells, which is about 50% of the total project fund for the coming years.
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The Comparison of Two Approaches to Modelling the Seismic Reflection From the Fractured Media with the Help of Grid-Characteristic Method
Authors P. Stognii, N. Khokhlov and D. GrigorievihSummaryThe fractured media bring in additional reflctions into the seismic data while carrying out the geological seismology works on looking for the hydrocarbons. in this work, the seismic reflections from fractures are being investigated. Two approaches to modelling fractures are represented. in the first case, the fracture normal is parallel to the boundaries of the grid nodes, and in the second case the fracture is not parallel to them. The first case of a horizontal or vertical fracture is simple for modelling, while the second one is more difficult. in this work, the approach to modelling inclined fractures with the help of the two-coastal infinitely thin fracture model is supposed. The comparison of the supposed method with the case, when the fracture is parallel to the boundaries of the grid nodes, is being held.
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Testing of Low Contrast Object by Resistivity
Authors A. Zlobinskiy and V. MogilatovSummaryTesting of low-contrast resistivity objects is a difficult problem for electromagnetic methods. If we identify electrical exploration with electrical exploration of TE-polarization, i.e. electromagnetic methods that uses classical sources of the electromagnetic field - a loop or a horizontal line, the problem really looks insoluble. We can suggest the solution of the problem on the other hand — use a circular electric dipole as the source of the electromagnetic field, and excite only the electromagnetic field of the TM polarization in the medium. When electromagnetic field in the medium is only the TM polarization then on the surface will be magnetic field from various threedimensional objects only. Three-dimensional objects have differences by some electrodynamic parameters with a horizontally layered medium. Anomalous field, as our experience shows, significantly exceeds the field calculated by classical models, using only anomalies of specific isotropic resistance. Such an anomalous field can be interpreted by complicating the generally accepted model, and introducing additional electrodynamic parameters into the calculations. The large anomalous field, which is created not only by a change in the specific isotropic resistance, allows us to confidently solve the problem of identifying three-dimensional objects that are not solvable for the classic TE-polarization.
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Is it necessary to use electrical exploration to search for hydrocarbons in Western Siberia
Authors A. Zlobinskiy and V. MogilatovSummaryAttempts have been made to add electrical exploration to the works in Western Siberia many years. These attempts usually rely on traditional electrical exploration using traditional loop and horizontal line as sours of electromagnetic fields. Loop and horizontal line are source of TE-polarization electromagnetic field (TE- electrical exploration). Traditional TE electrical prospecting is not all electrical prospecting in our opinion, in Western Siberia only electrical prospecting can be successfully applied with the predominant excitation of the TM-polarization field, i.e. with the presence of a vertical electrical component. Such electrical prospecting can be called TM electrical prospecting. The electromagnetic field is predominantly TM polarized, generated by a vertical line or a circular electric dipole (CED).
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Indirect Confirmation of Various Hypotheses About the Formation of Oil and Gas According to 3D Seismic Data in Western Siberia
SummaryOn the basis of 3D seismic surveys in the regions of Western Siberia, the waters of the Barents and Kara Seas, images are presented that indirectly confirm the participation of various hypotheses in the process of oil formation.
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Formation Fluid Type Identification Using Well Tests Interpretation
Authors A.G. Kozubovsky, T.V. Kuzmina and A.D. EfimovSummaryIn this paper we introduce the procedure of formation fluids identification by Build-Up using the composite model algorithm. This procedure intended for rapid determination of the formation fluid type during exploration
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Diagnostics of the Origin of Water Samples Taken During Cable Testing of Wells by Cable Testers
Authors N. Polskaya, A. Samoylenko, E. Petrukhina and O. SokolovaSummaryIn order to reliably diagnose the nature of water-based fluids selected from the reservoirs under study in an open hole, it is necessary to perform the most complete component analysis and compare with process fluids.
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Predicting of Permeable Fracture From Full-Azimuth Seismic Data Using AVAZ / FAVAZ Analysis
Authors A.N. Inozemtsev and V.N. SolovyovSummaryThe report presents the technology and results of applying full - azimuth seismic data processing in a local angle domain for studying of permeable fracture based on the joint use of AVAZ / FAVAZ analysis. Traditional AVAZ analysis provides information on the effects of HTI anisotropy associated with total fracturing (closed, permeable cracks), including their azimuthal direction. FAVAZ analysis provides information on the frequency variations in the spectrum of the reflected signals depending on the azimuthal direction associated with frequency absorption effects that occur in reservoirs with permeable fluid-saturated fracture. The report presents the process of sharing full-azimuth treatment in the local angle domain and AVAZ / FAVAZ analysis to highlight zones of permeable fracture, which was successfully used to predict carbonate reservoirs in one of the oil fields in the CIS. It is shown that using AVAZ / FAVAZ analysis, it is possible to predict zones of permeable (and, as a rule, oil-saturated) fracture. This improves the reliability of predicting the zones of oil-saturated fracture propagation compared to AVAZ analysis, which registers the common effects of HTI anisotropy. The effectiveness of the use of the results of AVAZ / FAVAZ analysis with the integrated interpretation of the results together with the seismic image of the structural-tectonic framework (SI-STK) is also shown.
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Determining the Angular Parameters of the Seismic Boundary Occurrence Based on the Use of Fixed Reflection Points
Authors V. Bondarev and S. KrylatkovSummaryA method for determining the local angular parameters of reflecting boundaries from the data of profile observations of CDP-2D is considered. Information about the angles of the boundaries is supposed to be used in the new technology of seismic imaging of the geological environment. To solve this problem, a special array of seismic traces corresponding to the same reflection point on the boundary is formed in each of the common calculation points from the array of seismograms obtained by the standard technology of multiple overlaps. After the introduction of special kinematic corrections into these traces, taking into account the difference in the length of the reflected wave trajectories, it is possible to perform a horizontal summation of the amplitudes or energies of the traces and attribute this result to the selected fixed point of reflection. Looking through the possible different values of the angle of inclination of the boundary and the depth to it, it is possible to localize the position of the maximum energy for specific values of depth h and angle φ. The maximum energy expansion will correspond to the actual slope angle of each reflecting boundary for the selected profile point. a graph showing the dependence of the energy of the total traces on the depth and angle, by analogy with the vertical velocity spectra, we will call the vertical spectrum of the angles of inclination of seismic boundaries. Examples are given of the spectra of the slope angles of the boundaries obtained on the model seismic field and the graphs of the slope angles of the boundaries at this point of the profile, showing the principal possibility of determining the angles of inclination of the boundaries with sufficient accuracy.
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Identification of Hydrophobic Rocks in Different Geological Conditions by Core and Log
Authors T.F. Dyakonova, I.P. Gurbatova, L.K. Bata and Yu.S. OsipovaSummaryIdentification of hydrophobic rocks in different geological conditions by core and LOG
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Investigation of the NMR Characteristics of Heavy Oil Samples and its Fractions Depending on Temperature and Group Composition
Authors M. Shumskayte, A. Burukhina, E. Chernova, V. Glinskikh and E. FursenkoSummaryThe paper presents the results of NMR studies of 10 heavy oil samples and its fractions from the fields of the Khanty-Mansi Autonomous Okrug and Yamal-Nenets Autonomous Area at the temperature of 20, 40 and 60˚С. The group composition of the samples has been experimentally determined by NMR data, which is consistent with the geochemical analysis data. The change of relaxation characteristics with increasing temperature is shown. Also we have established the dependence of the transverse relaxation time on the content of resinous-asphalting compounds at different temperature.
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Broadband Broadsweep Signals and Explosive Sources in the Same 3D Seismic Acquisition Project
Authors I. Korotkov, A. Zhukov, I. Dagaev and V. KarpovSummaryNewly developed Broadsweep vibroseismic technology was applied together with traditional explosive source seismic 3D acquisition during the same large land and transition zone seismic acquisition project. Resent developments in vibrator electronic system GDS-II were used for generation of broadband sweep signal. Resulting images after standard independent processing of two different datasets from two seismic sources show improved image quality and spectral content of Broadsweep signal data.
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Seismic Activity in the Areas of Oil Production in the Persian Gulf
Authors V. Abramov and A. KhibaSummaryThe movement of waves and surface currents in the Persian Gulf poses a serious threat to the destruction of oil production facilities in the Gulf. Sustained stabilization efforts will be required to maintain them. One of the solutions to this problem is to establish the frequency of seismic activity in the Bay and its zoning by the degree of seismic hazard.
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