- Home
- Conferences
- Conference Proceedings
- Conferences
Geomodel 2019
- Conference date: September 9-13, 2019
- Location: Gelendzhik, Russia
- Published: 09 September 2019
61 - 80 of 140 results
-
-
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.
-