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Geomodel 2017
- Conference date: September 11-14, 2017
- Location: Gelendzhik, Russia
- Published: 11 September 2017
61 - 80 of 131 results
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Features of Magnetotelluric Transfer Functions for the Central Part of East European Platform
By S. RiabovaSummaryMagnetotelluric transfer functions are in demand not only in researching of the Earth’s crust geoelectric structure, including in the allocation of the increased fracturing zone, and are also involved in monitoring seismotectonic processes in the lithosphere, establishing effects accompanying earthquakes and searching for possible ore occurrences and oil-gas-saturated deposits. In this work we present an analysis of magnetotelluric transfer functions for the mid-latitude conditions of the East European Platform. The analysis was carried out with the use of instrumental observations made at Geophysical observatory Mikhnevo and Geophysical observatory Borok from 2010 to 2013. The robust method of signal-to-noise separation was used as an evaluation of magnetotelluric transfer functions, which makes it possible to suppress noise of various types. As a result of the analysis of data from observatories Mikhnevo and Borok, the annual periodicity of the variations of the magnetic tipper and the magnetic tensor is established. In the magnetic tensor, annual variations are more pronounced in the variations of the phases of the main components, and in the magnetic tipper variations, along with the annual periodicity, there also are variations with a sixmonth periodicity and with a period of 60 days.
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Efficiency of Application of Geostatistical Inversion at Specification of a Structure of Oil-And-Gas Layers of the Jurassic Complex
Authors A.V. Shaykhlislamova, S.V. Gurina and T.R. SharafutdinovSummaryAs a matter of experience performance of seismic inversions for various geological tasks it is possible to draw a conclusion that the choice between deterministic and geostatistical methods needs to be made, proceeding from the set of geological objects and degree of study of the field. At an initial stage of development of the field it is enough to perform integrated forecast for deterministic inversion allowing to reveal zones of development of reservoirs with improved properties. In case it is necessary to specify a deposits structure during creation of geological model, planning of development drilling, in particular for a difficultly constructed and strongly changing on lateral reservoirs, it is necessary to use a method of geostatistical inversion. Possibilities of more objective forecast of petrophysical parameters of sandy reservoirs are extending, because of use of seismic data inversion in a complex with a structural factor, petrophysical modelling data, on the basis of knowledge of formation and a structure of oil-and-gas complexes of the region.
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Oil and Gas Content Analysis of the Tectonic Blocks of the Srednemessoyakhsky Shaft
Authors E.A. Potapova, L.A. Dubrovina and Y.V. LoshachenkoSummaryThere are more than one hundred reservoirs discovered within the Srednemessoyakhsky shaft and the great majority of them are tectonically screened. Due to uneven distribution of the oil and gas reservoirs over the tectonic blocks this work presents the prospectivity estimation of the undrilled tectonic blocks based on both definition and analysis of main productivity criteria for any blocks.
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Geological Chance of Success Estimation for Appraisal Objects in Western Siberia
Authors A.S. Meshcheryakova, M.G. Dymochkina and D.A. KotunovSummaryAs known, planning geological prospecting works occurs under conditions of high uncertainty, i.e. lack and inaccuracy of information about the object of research. Concerning, the geological exploration process is very risky, and it is necessary to estimate risks and systematically manage them.
A systematic approach to the geological risks analysis and their permanent analysis is important for increasing efficiency of the exploration program and improves economic performance.
The main tool for geological risk estimation is the geological coefficient of success (gCoS). As the result of world experience analysis in our company, the methodology estimation of geological coefficient of success designed. However, for a correct assessment is required to collect gCoS statistics for different evaluation objects and compare it with the actual results.
In order to approbate the assessment methodology and to calibrate it, an evaluation of exploration and prospecting drilling objects for the coming years ware made. After comparison of the current assessment and results, it will be possible to optimize our approaches to estimating the geological coefficient of success.
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Prospects of the Construction Regional Seismic 3D Cubes with Data of 2D Seismic Exploration
Authors A.Z. Nedostupov, T.R. Sharafutdinov and I.A. MushinSummaryAt the level of the modern study of the Russian Federation by seismic exploration there are still gigantic poorly studied territories such as Taimyr which still remains the least explored region of Russia in regard to geology. Solving the problems of zoning with traditional methods requires huge financial investments and, along with this, considerable time. Solving the problems of zoning with traditional methods requires huge financial investments and, along with this, considerable time. Therefore, innovative technologies, which help to reduce the time and economic costs for solving these problems, acquire special relevance recently.
After heterogeneous priori G&G data are converted to a predicted 3D seismic wave field we have succeeded to discover vast opportunities to identify and oil-and-gas bearing features both earlier known in oil and gasbearing area and new which have been not revealed and researched yet.
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Prospective Hc-Bearing Objects in Western Part of Yenisei-Khatanga Regional Through
By S. KarpukhinSummaryComplex interpretation for the Yenisei-Khatanga regional trough was conducted using the latest available well and 2D-seismic data. As a result of work more than 20 HC traps, falling into 3 categories (structural, structural-depositional and purely depositional), were identified. Traps are primarily associated with neocomian complex. Most traps are found to be purely structural and associated with inherited folds. These traps are accompanied by inverted circular structures (ICS) caused by low velocity anomalies (VAMP structures). Such features are clearly visible on time and flattened-time sections. For depositional traps localisation, strong correlation was found with thr geomorphology of pre-neocomian sea floor. Thickness maps for upper jurassic sediments were compiled to assist in delineating such depositional traps. Areal extent of tectonic-depositional traps appeared to be constrained by the northern part of the through. These traps are structural ones, but their closure in northern direction, which is critical due to the regional raising trend, is formed by the dipping clinororm beds.
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Structural and Geomorphological Analysis of the Latitudinal Ob in Western Siberia and Relationship with Petroleum Potential
Authors E.A. Manuilova, L.V. Panina, V.A. Zaytsev and G.A. KalmykovSummaryBased on the structural-geomorphological analysis of the the Latitude Ob territory young, active structures, which had been orographically expressed in the modern relief have been established. Regional structures that represent a combination of lifted blocks separated by narrow depressions were identified. Weak zones were established, mainly in the north-western and north-eastern directions. The shift faults (left- and right-handed) are identified, the combination of which demonstrates the conditions of submeridional compression. Interpretation of geomorphological and seismic profiles allow to reclassify some weak zones into discontinuous violations. Correlation of surface and deep dislocations was carried out. Some of the newest structures have partially inherit the ancient structure plan. It has been established that oil and gas fields are attracted to the latest achievements, zones of new shift faults, sub-regionally oriented weak zones and tears.
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Developing a Unique Size 3D Geomechanics Model - Features and Advantages. East Siberia
Authors M. Lushev, E. Tryasin, D. Maximov, S. Kreknin, V. Pavlov, S. Strakhov, E. Korelskiy and A. ZinovievSummaryIn the context of developing the unique three-dimensional geomechanical model shows a number of a new technical solutions under conditions of extremely large size of the modeled area, without sacrificing high detailization of model which is sufficient to solve the problems of the construction and completion of wells in areas of exploration drilling.
First time in the world realized the development of a unique scale three-dimensional geomechanical model covering the entire contour of the field - 20,000 km2. The main stages of model development was reviewed based on the technical and geological characteristics of the modeled area to offer a unique solution. Analyzed the applicability of new technical solutions on the example of a particular field.
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Structural Features and Petrophysics of Low-Resistance Reservoirs of the Western Siberia Vatjegansky Upper Jurassic Oilfield
Authors V. Terentyev, T. Dyakonova, A. Komova and L. BataSummaryIn this paper, the features of low-resistance reservoirs of the Vasyagan series of Western Siberia Vatjegan oilfield are observed along with possible reasons of rock resistivity decrease. As a result of intensive core samples research a conslusion is made that the main influence on a rock resestivity decrease of the Vatjegan oilfield UV1 layer is done by fractional composition of sediments. An algorithm was developed to divide UV1 reservoir layers by lithotypes based on GIS data which corresponds to the traditional and lowresistance parts of the cut. The problem of estimating the oil saturation coefficient is considered, a technique is proposed for evaluating the character of the reservoir saturation of the investigated sediments, depending on their filtration capacity.
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Automated Thermal History Reconstruction of Basin in West Siberia Using 2D Inverse Modeling
SummaryUnderstanding thermal and structural evolution of sedimentary basin is a key to assessing the hydrocarbon prospect. In the common approach to reconstruction of this evolution, a priori knowledge of thinning factors and paleobathymetry is required (while necessary data is commonly not available), sub-basin crust and mantle lithosphere evolution is omitted, and information about basal heat flow (it is usually getting from published heat flow maps, while this data is highly unreliable) is used as a boundary condition. Automatic correction of the prescribed heat flow is performed to get a good matching of modeling results with measured present-day temperature and maturity indicators. As a result, the approach gives multiple solutions and leads to fluctuations in temperature and maturity without proper physical/geological justification. There is an alternative approach to thermal reconstruction, resolving simultaneously for lithosphere and sedimentary basin processes. It involves an inverse algorithm, which iteratively updates crustal- and mantle-thinning factors and paleowater depth until the input stratigraphy is fitted to desired accuracy. The potential of this approach is demonstrated through comprehensive study of a transect across the West Siberian basin. Different geological scenario was considered, parametric study on key parameters was done, and the thermal blanketing effect of sediments was demonstrated.
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The Approach to Parametric Multidimensional Inversion of Marine Electrical Prospecting Data Considering Bathymetry
Authors M.G. Persova, Y.G. Soloveichik, D.V. Vagin, D.S. Kiselev, Y.I. Koshkina and D.N. KurskiyaSummaryThis paper proposes the approach to multidimensional inversion of the marine electrical prospecting data in the time-domain, which are obtained using the Differential Normalized Method of Electrical Investigation (DNME). This approach is based on the parametric (model-based) nonlinear multidimensional inversion with the simultaneous recovery of the borders coordinates of the 3D inhomogeneities and their electrophysical properties (electrical conductivity and polarizability). The solution of forward problems and calculation of the field of the impact of geoelectrical model parameters are performed with the use of the finite element method. The inversion is carried out in two stages including the division of measured signals into the electrodynamic component and signals of the induced polarization field. The subhorizontal borders of structural parts of the geoelectrical model can be either fixed (for example, according to the sea depth variations or borders, obtained by seismic methods) or recovered. The possibilities of the proposed approach are shown with the use of synthetic data for the generalized geoelectrical model which was constructed on the basis of the results of the DNME data interpretation obtained in several sea areas.
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The Approach to Processing the Data of Induction Logging in Horizontal Wells in the Presence of the Fault
Authors M.G. Persova, Y.G. Soloveichik, Y.I. Koshkina, D.V. Vagin, D.S. Kiselev and I.I. PatrushevSummaryThis paper proposes the approach to data processing, which allows quite a fast determination of the fault location using the induction logging data obtained in horizontal wells. The proposed approach is based on the use of the 1-D inversion and inversion based on the use of 2.5-D or 3-D finite element modeling. At the first stage, we determine a zone which is characterized by the dramatic change of the geoelectrical model parameters obtained as a result of the 1-D inversion in the adjacent points on the logging tool motion trajectory. Then, in this zone, we perform the multidimensional inversion which results in determining the point of intersection of the fault line and trajectory of the tool motion. The possibilities of the proposed approach are shown with the use of synthetic data obtained by 2.5-D modeling for the geoelectrical model which is specific for the problems of induction logging in horizontal wells. We show that the location of the point of intersection of the fault line and trajectory of the tool motion is determined quite accurately, and the computational time, which is required for the multidimensional processing in a separate zone, is about a minute when we use a personal computer.
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Three-Dimensional Density Model of Enisey-Khatanga-Region
Authors I.V. Lygin, A.P. Afanasenkov, T.B. Sokolova, K.M. Kuznetsov and G.S. GrigorievSummaryYenisei-Khatanga regional trough (the borderland of the Siberian platform) is poorly studied area by seismic method. At the same time, the territory is more than 70% covered by gravity and magnetic. In this case high efficiency of integration based on the analysis and interpretation of gravity and magnetic fields is evidence.
Joint interpretation of potential fields data and seismic data has allowed to clarify the structure of seismic horizons in space between seismic lines and offer original underlying three-dimensional density and magnetic model of the earth’s crust. These models made new insight on the geological structure and geological history of the region. The key result was a volumetric reconstruction of the tectonic elements of the Yenisei-Khatanga rift system. The technique of creating three-dimensional density model and its use in geological reconstructions is in this report.
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New Geological Data for Model of Sorokin Arch Artinskian Oil Reservoir
Authors A.A. Chistyakov, A.V. Demidov and A.F. KadyrovSummaryThis article contains the evaluation of the geological influence over unpredictable and low production rate of Artin age oil reservoir situated at Sorokin Arch. The SCAL results, FMI, logging data and seismic were analyzed during current research. As the result, the new conceptual model was designed including structural and lithological features. As the consequences, the link between production rate and geological features was recognized.
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The Problems of Indexation of Productive Layers and Reflecting Horizons of the Jurassic Deposits of the North-East of Western Siberia
Authors I.N. Nizamutdinova, A.P. Zhukov and L.B. PetrykinaSummaryA brief review of the existing problems of indexation of productive layers and reflecting horizons of the Jurassic deposits in the north-east of Western Siberia is given, the necessity of creating a single stratigraphic-correlation basis for the region is considered. The authors compiled a consolidated unified stratigraphic diagram of the northern regions of Western Siberia according to a new structural and facial regionalization of the Jurassic deposits, which is based on the results of the studies carried out to solve the problems of regional mapping of oil and gas reservoirs.
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Modern Seismic Field Acquisition
More LessSummarySeismic field acquisition play a great role in receiving good materials in seismic prospecting. The latest improvements in seismic acquisition is possible to read in materials of annual geophysical conventions. We used this materials to inform our specialists about news in field technologist. It is the aim of our report. We note next directions in modern field seismic acquisition: - theoretical and experimental investigations in seismic wave generation; - development of field vibroseis equipment. We demonstrate the high geological effectiveness of modern seismic field acquisition.
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Modeling Hydrothermal Circulation During Formation of the Oil and Gas Deposits in Volcanogenic Structures
Authors A. Kiryukhin, P.O. Voronin and O.O. UsachevaSummaryTOUGH2/TOUGHREACT modeling used to reproduce possible hydrothermal circulation regimes during formation of oil volcanogenic reservoirs (Rogozhnikovsky oil rhyolite reservoir (West Siberia) and White Tiger oil granite reservoir (Vietnam)) and water-methane deposits in volcanogenic-sedimentary basins (Kshuksky (West Kamchatka) and Koryaksky-Avachinsky volcanogenic basin (East Kamchatka)). Mutnovsky hydrothermal system used as a referenced example.
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Seismic Non-Linearity in Case of Single Shot Impact. Matched Non-Linear Operator Calculation
Authors A.A. Arkhipov and V.S. TyrichevSummarySignificant non-linear effects of geological environment in seismic data are obvious in case of vibration impact. Authors described their version of non-linearity explanation in case of single shot impact. First time a method of linearization of seismic data introduced. Method allows noticeably rise correlativity between linear-modelled data and conventional seismic.
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Development of the Approach for Automatic Well Logging Interpretation for Big Number of Wells with the Use of Machine Learning
Authors M.F. Validov, A.R. Ismagilov, D.S. Voloskov, M.S. Magdeev and A.A. NazarovSummaryThe increased interest for geological and reservoir simulation model construction for the old fields raises the issue of reinterpretation of well logging data of the old well stock, taking into account the concepts of geology, specified during the period of field production. This work shows the results of mathematical approach development for automatic interpretation of well logging data of the old well stock. The work is aimed to solve the problem of fast reinterpretation of a standard logging set using machine learning algorithms. The solutions obtained for the determination of stratigraphic boundaries with the use of logistic regression and the detection of lithotypes basing on the support vector machine are presented. Mathematical algorithms and approaches to use them are presented and described.
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Modeling of Three-Dimensional Magnetotelluric Fields by Vector Finite Element Method Using GPU
Authors P.A. Domnikov and N.V. KondratyevSummaryThree-dimensional modeling of magnetotelluric fields using the vector finite element method is carried out. We use the vector differential equation for the single vector-potential and the system of vector-scalar equations for the coupled vector and scalar potentials. We use the edge-based vector basis functions for the vector potential and nodal basis functions for the scalar potential. We use the COCR solver for the solution of the large sparse system of linear equations with Jacobi and folded preconditioner. The CPU and GPU implementations of the developed methods are compared. We test our methods on complex realistic problem of three-dimensional magnetotelluric sounding providing in Russian Far East. The conducted experiments show the advantage of GPU using.
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