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Geomodel 2017
- Conference date: September 11-14, 2017
- Location: Gelendzhik, Russia
- Published: 11 September 2017
81 - 100 of 131 results
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Wave Modes Study for Acoustic VTI Equations
Authors D.I. Sabitov, M. Charara, Y.A. Nikonenko and A.A. DotsenkoSummaryThe application of reverse-time migration (RTM) on a large scale has become affordable and has led to significant advances in seismic depth imaging in complex areas, especially for sub-salt imaging. For imaging in anisotropic media with vertically transverse isotropy (VTI), RTM is usually based on an acoustic VTI approximation of the elastic wave equation by setting the vertical shear-wave velocity to zero. However, these equations generate artificial pseudo shear-waves that spoil any seismic imaging process. By studying the wave modes associated to that equation, we identify that a second mode exists for the anelliptic case, i.e., when the Thomsen parameters ∈ is different from δ. This mode generates the spurious pseudo shearwaves. We show that as long as the simulation of the P-wave propagation is consistent with the usual marine seismic wavelengths, the spurious pseudo-shear wave is not generated or very weak compared to the P-wave mode. We illustrate this fact, for the case of a homogeneous medium modelling and for the more realistic case of a 2D Salt body modelling.
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Special Aspects of Complex Reservoirs Interpretation on the Example of Pannonian Basin
Authors E.F. Tcukanova, K.A. Ezhov and E.S. MileiSummaryThe main objectives of this work is to prepare complex petrophysical and geological model for complex reservoirs: heterogeneous sandstones-conglomerates and naturally fractured metamorphic basement. Each case is very actual not only for local experience but for the global understanding: number of objects with the complexity is increasing, that means the time of pure and clear sandstones has passed. We need to develop and use new approaches, based on more advanced tools and interpretation techniques.
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Curvilinear Spectral Elements Application for Sonic Logging Forward Modeling
Authors D.I. Sabitov, M. Charara and A.A. DotsenkoSummaryThe interpretation of sonic well logging data is a challenging problem for researches in the oil industry. A fast and accurate numerical method is needed to get the cleat picture of the physics of wave propagation in complex geological surroundings with the presence of strong discontinuity of fluid-solid interface. The Spectral Element modeling allows to solve efficiently the 3D dynamic wave propagation problems with complex physics. For sonic logging problems together with appropriate choice of spatial mesh step size the correct approximation of borehole geometry affects the accuracy of the numerical solution. The goal of this work is to extend the spectral element method to deal with the curvilinear elements and to show its addition value for the mesh construction, approximation of the geometry and increasing the accuracy of numerical solutions.
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Integrated Technology of Planning and Geological Support of Well Drilling
Authors M.V. Ovcharenko, A.N. Lanin and I.V. EvdokimovSummaryWell planning, support of well drilling, geological modeling, hydrodynamic modeling
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A New Approach to the Analysis of Gas Anomalies in the Subsoil Geosphere for Oil and Gas Exploration
Authors O.K. Navrotsky, A.N. Zotov and A.M. DotsenkoSummaryFor oil companies operating in relatively small license areas, it is quite difficult to take advantage of all the scientific methods for solving their problems in terms of scientific, organizational, financial positions. In this paper, the authors share the experience of integrating structural geomorphological studies and gas surveying that led to the discovery of an oil field in the northwestern part of the Caspian depression
The results of the work allowed us to formulate a new principle for interpretation of gas-geochemical testing of local objects in the forecast of oil and gas potential: areas that are characterized by a minimal hydrocarbon geochemical background and minimal tectonic tension are promising in the oil and gas respect. Special gas-geochemical (during August-December) studies at the open field showed that hydrogen does not exist in its subsoil gas.
Obviously, we need to make some clarification - the noted regularity is characteristic for territories with a direct character of the relief. In this case, the correlation of the structural plan of the deposits of the Bobrikovsky age in which the hydrocarbon depositsare detected and the relief is confirmed by high values of the correlation coefficient (0.7).
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Geological Characterization of Continental Deposits in Case of Heterogeneously Saturated Reservoir
Authors M.I. Lezhnina and A.O. VaysmanSummaryThere were made prediction of the lateral distribution of facies zones in the interval of PK1-3. It has been established that for facial “A” and “C” cyclites can not be separated by facial zoning. At the same time, in facie “B” the boundaries are delineated, within which delta channels extended to varying degrees of extent, connected in area and section, associated with belts of meandering delta channels. Based on the interpretation of the logging data, as well as intermittent sampling of the MDT samples, it was possible to distinguish the zones depending on the saturation: the hydrodynamic inconnectivity of the cyclite A with the underlying sediments in the central part of the deposit. There were established that the OWC level is controlled by a structural factor, it is hypothesized that the reservoir PK 1-3 is “insufficiently formed”
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Conceptual Geological Modeling of Achimov Layers in Terms of Severo-Samburgskoye Field
Authors D.O. Mishina and K.A. BogdanovaSummaryThis work includes investigation of all information and from this creation of two different geological scenarios for achimov layer of Severo-Samburgskoye field, that take into account all field uncertainty. First of all it includes inspection of core and detection of facies with typical reservoir characteristics. Than core information is transferred into well without core recovery using well survey data. Also we performed seismic interpretation and choose such attribute that allow to contour facies distribution on space. After that we distinguish well test results and recognize that they illustrate different results, so decision was taken to create two different geological scenarios,. First of which includes one united reservoir with assumption that results of well test are incorrect, the second variant of geological scenarios includes three reservoirs that disconnected with each other and have it their own oil water contact. Than we estimates optimal development strategy for each variants and understand that for further decisions it Is necessary to implement additional exploration program which allow to reduce risks and as consequence to increase economic efficiency.
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The Layer-Based Approach for Hybrid Parameterization of Model. Tomography in the Conformally Layered Model
By R. AnisimovSummaryIt will be presented generalized layer-based model and conformally layered parameterization of stratum which is a layered analogue of stratigraphical mesh. Also nonlinear tomography will be discussed which is using for determination parameters of such model type.
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Forecast the Zones of Development of Crust of Weathering by the Scattered Component of the Wave Field
Authors E.V. Anokhina, M.N. Nazarova, G.N. Erokhin and L.F. ZhegalinaSummaryA characteristic feature of deposits in the weathering crusts is the presence of cracks. To effectively identify such zones, the scattered component of the wave field is used. Specific examples show the mapping of the productive zones of the weathering crust in the field of scattered waves.
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Geological Model of Novoportovskoe Field for Geosteering
Authors A.V. Karnaukhov, D.O. Mishina, D.A. Reshetnikov and L.R. SamigullinSummaryNovoportovskoye field is one of the most perspective object of the Company, which contains high oil reserves. In 2015 has been started full-scale drilling on main production targets – NP2-3, NP4, NP5, J2-6. On line navigation requires geological model that has good ability of prediction and shouldn’t change in zones situated far from drilling region. Geological modelling performed in Shlumberger Petrel 15.4. Five algorithms were examined. Suggesting algorithm is using Truncated Gaussian Simulation with 3d trends made with Trend Modelling. Suggesting algorithm provides better ability of prediction and makes geological model more sustainable.
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Forecast of Fracture and Cavernous Reservoirs of the North-Barents Shelf by Scattered Waves
Authors L.F. Zhegalina, G.N. Erokhin, E.V. Anokhina and M.N. NazarovaSummaryThe results of a complex interpretation of the reflected and scattered wave fields are presented to refine the fault-block model and fracture and cavernous reservoirs forecasting of both tectonic and lithogenetic origin. The forecast is based on the original pre-stack migration method - Common Scattering Point Dip (CSPD).
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Justification of Procedures for Differentiation of Siliciclastic Reservoirs by Their Flow Properties (A Case Study from Devonian Sandstones of the Republic of Bashkortostan)
Authors A.M. Khusainova, T.V. Burikova, A.A. Gubaydullina, O.R. Privalova and R.V. AkhmetzyanovSummaryThe objective of the research is a reference framework set of petrophysical data characterizing the Devonian siliciclastic sediments of the study area. The characterization workflow includes three main stages: the first is the lithological typification from core description, the second is matching of the identified lithotypes with their petrophysical properties and the third is testing the model against wireline logging data.
The core from selected wells was described for lithological typification and studied with routine and special core analysis procedures in the laboratory. It is well known that shale content changes the physical properties of the rock, hence the results of the particle size distribution analysis were used to group the samples into classes based on the grain size subject to the ratio of clay material in the rock fabric. The normal trend is observed for increase in shale content with smaller grain size.
Based on the lithological description all the samples were grouped into three petrophysical classes then characterized by their own petrophysical relations and constants. This approach is based on the fact that the shave volume as opposed to grain size can be estimated from well logs and then applied to reservoir characterization and differentiation.
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Geological Structure and Prospects of Oil and Gas Content of Late Baios- Callovian Deposits in the Western Part of the Yenisei-Khatanga Regional Trough
By D.S. LezhninSummaryIn the present work, an example of one of the regions located in the junction zone of the West Siberian plate and the Yenisei-Khatanga regional trough has been considered, methodological methods for identifying and mapping reservoirs in the Middle Jurassic sediments are considered. The research was carried out on the basis of the integration of seismic data, GIS and the results of petrophysical studies of core material. As the actual material, temporary seismic sections of 2D in the volume of 2988 running meters were used. Km and drilling and GIS data for 49 deep wells.
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Problem-To-Solution Approach to Characterization and Differentiation of Pore Types in Carbonate Reservoirs
SummaryThe paper reviews the problems of differentiation of reservoirs with mixed types of voids including fractures, vugs and moldic pores for heterogeneous Lower Devonian and Upper Silurian carbonates of R. Trebsa oilfield (NAO) and Tournaisian-Frasnian carbonates of Tabynskoe oilfield (Bashkortostan) using core, wireline logs and production tests.
The algorithms are presented to obtain additional information on textural features of the reservoir facies from integration of core data with results of extended logging suite. The study results in the reservoir flow model based on the ratio of connected pores, secondary voids, clay content by volume and to a greater extent relative shaliness. Matching of permeabilities measured on samples in the laboratory both on whole-sized core and plugs to permeabilities estimated from well logs and flow tests revealed their different combinations in high-productivity and low-productivity wells producing from complex carbonates ranging in age from Upper Silurian to Lower Devonian on R. Trebsa oilfield and Upper Devonian to Lower Carboniferous on Tabynskoe oilfield. The integrated reservoir characterization from core data, special and standard methods of well logging, flow tests and production tests results in a new classification of reservoir facies and estimation of the range of the poroperm properties for the identified classes.
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Studying of Wave Processes in a Rock Mass by Technique for Recognizing Fractured Zones in Fields of Seismic Waves
More LessSummaryThe results of the application of the specialized interpretation technique for recognizing fractured zones in areas of fractured reservoirs in Eastern Siberia are presented. The technique is based on the search criteria we established in the amplitude and spectral parameters of longitudinal reflected waves, developed at the Mining Institute of the Ural Branch of the Russian Academy of Sciences. Prospecting indicators for fractured geo-objects of different types are established a posteriori by examining the links between fractures’ parameters and dynamic attributes both in the laboratory as well as under conditions of natural occurrence of rocks. he search for a physical justification for the established patterns of behavior of the dynamic parameters of seismic waves allows us to study and understand more deeply the wave processes occurring in an array of fractured rocks. The effect of increasing the value of the frequency coordinate of the centroid in the zones of small differently oriented cracks is revealed, which manifests itself both in mathematical and physical modeling, and on fractured objects of oil and ore deposits. It can be realized due to non-coherent summation of waves of different frequency and amplitude. The presence of different-frequency waves, in our opinion, is due to the internal structure of the fracturing zone, in which the formation of waves of different types: separate interference waves, multiply reflected from the superface and the subface inside the fracture; channel-wave signal - Rayleigh wave modes and Love wave modes; Monochromatic waves on which an incident wave splits in when reflected of non-mirror from geometrically and physically rough interfaces; diffracted waves.
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Global Climate Change
Authors I.I. Nesterov and V.I. SamitovaSummaryIn Geology, studied a wider range of measurement parameters, but most of them increases (decreases) under the influence of the moon, Sun and Galaxy in which Earth is situated. Therefore, in contrast to classical thermodynamics, and astrophysics made an attempt astronomical calculations to produce a new methodology using the parameters and processes of the past and what is happening on the Ground and its depths.
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Features of Changes of the Properties of Reservoirs and Oil of Massive Reef Deposits of Volgograd Region
Authors S.I. Chizhov, D.S. Sergeev, N.S. Sibileva, A.N. Stepanov and M.A. SibilevSummaryThe revealing of reguarlty of changes of reservoir properties (porosity) and formation hydrocarbon systems through the deposits height are of significant theoretical and practical interest for the massive (reef) deposits.Processing of the results of complex field-geophysical studies (porosity determination) through the wells of evlano-livensky horizon of Pamyatno-Sasovskoye field are selected and analyzed. In general, significant changes of reservoir properties of oil at the height of the deposits is not observed, however, in massive deposits with large floor oil-bearing porosity changes from the arched part of fluidmaster, the pressure saturation is changed by the same principle.
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Geologic-Geophysical Support of Drilling Horizontal Wells (LWD)
More LessSummaryThere are many of factors, which should be taken in geophysical methods for study horizontal wells during drilling. They are bound with characteristic of using the software-hardware complex of GWS (geophysical well surveys), technology of works in the planning stages and carrying out of studies. Also factors are coupled with methodical dimensions of treatment and interpreting geological-geophysical information. Developing systems of fields with horizontal wells - is the most promising direction for involving the hard-to-recover oil and gas reserves to the commercial production.
Geologic-geophysical support of drilling horizontal wells is managed round-the-clock for determining the optimal trajectory for the well’s horizontal section to ensure greater productivity, as well as for effective realization of the objectives, which were planned.
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Evaluation Test of Initial Information and Results of Data Processing of Geophysical Surveys of Wells at Creation of Seismogeological Models
More LessSummaryIn Western Siberia at the heart of the solution of explorative tasks on naphtha and gas the complex of the GIS methods — seismic exploration lies. Seismogeological models are a basis for creation of geological models of oil and gas objects. In recent years, in connection with complication of prospecting tasks, limitation of resources, special attention is paid to increase in effectiveness of geophysical surveys. Increase in requirements to quality of seismogeological models, causes increased requirements to quality of geophysical surveys in the wells providing a petrophysical basis of interpretation. Accuracy of a binding of data of seismic exploration and results of seismogeological constructions in general depends on their quality. In work the adaptive (operated) approach to data processing of the geophysical surveys of wells (GSW) for creation of seismogeological models based on formalization of an index of quality of results of processing and the interconnected accounting of major factors not of the bound to the studied objects is offered.
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Geological Structure and Petroleum Potential of the Area High-Latitude Ob Riverside
Authors I. Panteleyko, A. Rube, I. Supolkina and E. GachegovSummaryThe present article is based on results of integrated geological-geophysical researches. The article illustrates short data of geological-geophysical surveys, geological structure and petroleum potential of the field, estimation of the region petroleum potential and recommendation for search drilling.
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