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5th EAGE St.Petersburg International Conference and Exhibition on Geosciences - Making the Most of the Earths Resources
- Conference date: 02 Apr 2012 - 05 Apr 2012
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73834-23-1
- Published: 02 April 2012
61 - 80 of 178 results
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Application of Electroprospecting Methods for the Prediction of Oil and Gas
By D. PopovThe paper is devoted to the experience of joint use of such methods as Transient Electromagnetic soundings (TEM) and Differential Normalized Method of Electrical prospecting (DNME) in the Siberian platform. Profiles and maps of geoelectric parameters were obtained. Well data were used to determine the electrical resistance typical for a hydrocarbon reservoir. According to the results of DNME identified areas with anomalous polarization coefficient, which in some conditions can be due to hydrocarbon accumulations. Based on these methods the forecasting of oil and gas locations have been done. The high convergence of results from different methods is observed. Keywords: electroprospecting methods, Transient Electromagnetic soundings, Differential Normalized Method of Electrical prospecting, electrical resistance, induced polarization, Siberian platform, search for oil and gas deposits.
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Geochemical Source Rocks Evaluation and Hydrocarbons Studies in North of Dezful Embayment
Authors M. Daryabandeh and F. TezhehIn the context of this evaluation, the most relevant ones are the Lower Cretaceous Garau, and Middle to Upper Cretaceous Kazhdumi and Gurpi Formations and the Tertiary Pabdeh. The potential source rocks investigated include the Pabdeh, Kazhdumi and Garau Formations. These three formations, which are important source rocks in the basin and have been discussed extensively in the literature, were used as a laboratory standard in this study. The crude oils examined in this study were obtained from reservoir formations of various ages from throughout the area. The source rock screening analysis indicates that the Garau and Kazhdumi especially from the Northwestern part of the area, and Pabdeh in the southeastern part have substantial oil-generation potential. The Gurpi is not a source rock, although has mostly black shales. Selected source rock and oil samples were characterized in more detail, and the distributions and concentrations (both relative and absolute concentrations) of biomarkers in different source rocks and oils were determined. The biomarker characteristics were combined with other geochemical and geological data to interpret the sources, depositional environments, lithology and maturity. Oil–source rock correlations were made between source rocks and a number of crude oils based on quantitative and qualitative biomarker distributions.
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Stratification of the Upper-Jurassic Sediments Based on 3D-seismic Survey (Middle Near-Ob' Region)
Authors S.V. Lyagushov and I.A. PeshkovaLayering of the Achimov sediments based on 3D seismic survey data to trace the top and the bottom of the Achimov sediments, to establish a strong correlation between seismic characteristics and log data, and, as a result, to develop seismogeological base for geologic modeling. Efficient use of seismic inversion for layering structurally complex Achimov sediments and solid forecast of their reservoir properties
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Inversion History of the Southern Area of the Llanos Basin, Colombia
Authors A. Escalona and C. Moreno-LopezThe Llanos basin is the most prospective basin for hydrocarbons in Colombia. Usually the main hydrocarbon system is related with the foreland basin phase developed during the Tertiary. However, recent discoveries in the southern Llanos basin associated with inversion of Paleozoic structures forming gentle anticline structures in the Cenozoic interval indicates a new trend in exploration. This study uses seismic and well data, in addition to previous work in the area, to describe the tectono-stratigraphic evolution in order to understand the different styles and timing of deformation and how the Paleozoic inverted structures control the petroleum system.
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Regularities of Lithofacial Variation of Productive Series Sediments of South Caspian Basin
More LessIn the last hydrocarbon exploration has intensified in the offshore part of the South-Caspian Basin (SCB). New data allowed detailing regional distribution of reservoir beds and facies change of the Productive Series. Regional patterns of change in reservoir and lithofacial properties of the Productive Series (PS) deposits of SCB have been studied on over 1000 rock samples from 40 wells, as well as on 25 thin sections. Determination of lithological and reservoir properties of rocks allowed drawing a series of maps reflecting regional variation of the parameters. In addition, 5 lithofacial zones encompassing the upper and lower divisions of the PS (except for the Baku Archipelago). Facies of the PS lower division have been found to differ from those of the upper division in that south-westerly silty-clayey fraction exhibits substantial increase and carbonate content of rocks increases slightly.
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The Influence of the Bazhenov Structure on the Reservoirs Formation on Kalchinskaya Area
Authors R.R. Khalimova, L.V. Chernovets and I.A. RafikovThe Bazhenov suite sediments are one of the prospects and at the same time unique in the architecture on the Uvat area. Bazhenov suite is one of the main source rocks, seal for overlying layers, and also is independent oil reservoir at that part of area where it has anomalous structure. Complicated tectonic structure is one of the possible migration paths for overlying Neocomian sediments and perhaps it is the cause of insignificant presence of hydrocarbonate in the underlying Jurassic sediments. In this paper we present complex logging analysis, sedimentological core analysis, seismic facies analysis and dynamic 3D seismic data analysis and acoustic inversion interpretation results
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Sequence Stratigraphy as a Tool for Geological Interpretation of Seismic Data - Case Studies
Authors E.O. Malysheva, V.V. Bykov, D.A. Daudina, M.L. Evdokimov and T.F. SokolovaSequence stratigraphy was introduced and applied to geological studies as a tool for prediction of reservoirs, seals and source rocks. It integrates regional geological, well and seismic data. Current paper presents the results of case studies in different sedimentary basins of Russia. Sequence stratigraphy was applied to the fields and areas with different structural and depositional paleoenvironments. It proved to be most effective in the The Western Sybirian clinoform neokomsky formation (K1). The approach, used to identification of sequence boundaries, maximum flooding and transgressive surfaces, was based both on seismic and well data. The most favourable location of reservoirs was predicted in fan and channel complexes of lowstand sequence tract and shelf bar complexes of highstand sequence tract.
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Geological Model of Deepwater Turbidities of Tuapse Trough Based on Seismic Attributes, Spectral Decomposition and RGB
Authors O.A. Almendinger, A.V. Mituykov and M.M. PopovRecent advances in deep water drilling technology have opened new domains for hydrocarbon exploration. And now they have became one of the main targets for drilling. Nevertheless because of the high costs when operating offshore in deep water, requires an integrated approach. This study is an example of detailed approach taken to the characterization and interpretation of deepwater fans of Tuapse Trough in Black Sea. Use of variety of 3D standart seismic attributes, spectral decomposition and RGB blending has considerably advanced the geological model of fan complexes.
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New Approaches to Geological and Hydrodynamical Modelling of Fractured Reservoirs in East Siberia on the Base of Complex
Authors V. Kharakhinov, S. Shlenkin, V. Zereninov, O. Koulishkina and A. MasjukovWe propose a technology for geological and hydrodynamic modelling of fractured carbonate reservoirs. The technology is based on integrated interpretation of 3D seismic reflected and scattered fields and the borehole information.
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The Prediction of Oil-gas Perspective Reservoirs in Terrigenous Vendian and Lower Cambrian Deposits of East Siberian
Authors V.I. Mitasov, I.A. Kushmar and V.A. KondratevПрогноз залежей нефти и газа в продуктивных терригенных отложениях Восточной Сибири по данным сейсморазведки представляет собой весьма сложную задачу, что обусловлено отсутствием структурного контроля этих залежей. Поэтому различие между коллектором и неколлектором должно быть зафиксировано по характеру изменения динамических атрибутов сейсмического волнового поля. Подобная процедура осуществляется уже на этапе первичной обработки полевых сейсмических материалов с сохранением динамики сейсмического волнового поля. Это значительно улучшает выразительность сейсмического волнового поля и повышает соотношение «полезный сигнал»/«помеха» практически на порядок а сейсмические горизонты в интервале А-Ф прослеживаются по латерали в виде четких когерентных отражений. Расчет теоретических значений плотности на основе использования параметров петрофизической модели, позволяет определить геоакустические свойства изучаемой среды, что обеспечивает установление устойчивых коррелятивов между атрибутами сейсмического волнового поля и коллекторскими свойствами горных пород через их акустические жесткости. Анализ динамических атрибутов сейсмического сигнала позволил выделить наиболее информативные из них, позволяющих зафиксировать различие в волновой картине между «сухими» и «приточными» скважинами, расположенными на одном профиле. В результате двумерного сейсмоакустического моделирования было оптимизировано число атрибутов, которые имеет смысл использовать для установления их количественных взаимосвязей с коллекторскими свойствами. Установлено, что наиболее информативными атрибутами явились те, в формирование которых существенный вклад привнесла амплитудная составляющая. Приводятся практические примеры прогноза нефтегазоперспективных оюъектов в сложных геологических условиях Восточной Сибири.
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Structural and Sedimentological Criteria for Traps Prediction in Miocene Deposits, Abin-Ukrainian Field
Authors P.A. Zemtsov, V.S. Derduga, A.V. Derduga and S.V. KuksovResearch area is located within southern flank of the West Kuban Trough. The final stages of the trough forming are connected with both the intensive growth of Caucasia orogen and the thick molasses filling. This has led to the post and synsediment tectonic processes and, as consequence, all this has been the reason of forming of the oil-fields with the specific geological complexity which are greatly differ from the HC traps in a platform conditions. Most of the fields in this area are mature. However structural analysis and sedimentological researches have been conducted quite rare and, commonly, in the initial exploration stage. As a result these parts of the structures, which were not enough studied by the drilling, are remained disputed. This has predetermined a need of the wells and seismic data review on the basis of modern techniques of of geological interpretation.
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Degree of the Level of Scrutiny and the Basic Directions of Prospecting Works in the Northern Part of the East Kamchatka Deflection
Authors N.A. Kulakovskiy and M.A. GrigoryevИзложены перспективы нефтегазоносности северной части Восточно–Камчатского прогиба
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3D Joint Inversion of Marine Magnetotelluric and Controlled-source Electromagnetic Data
Authors A.V. Gribenko, M.S. Zhdanov and G.A. WilsonMagnetotelluric (MT) data naturally manifests itself as noise in marine controlled-source electromagnetic (CSEM) data. It follows that MT data can be extracted from measured CSEM data for the relatively negligible cost of additional data processing. MT data has a lower yet broader frequency content relative to the higher and narrower frequency content of CSEM data. Moreover, MT and CSEM methods are sensitive to different geological structures. With the availability of complimentary data sets, we present a new approach to the 3D joint inversion of both CSEM and MT data. Our method is based on the 3D integral equation method for modeling, and focusing regularized inversion. Our examples of a hydrocarbon-bearing reservoir adjacent to a salt dome show that joint CSEM and MT inversion has better model resolution compared to CSEM or MT inversion alone.
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3D CSEM for Hydrocarbon Exploration in the Barents Sea
Authors D.V. Shantsev, P.T. Gabrielsen and S. FanavollLarge multi-client 3D CSEM surveys have been acquired in the Barents Sea in 2008 and 2010. This data has been used by oil companies in Norwegian license application rounds to support their geological models and prospects. We show case examples where 3D resistivity models obtained by inverting CSEM data help locate areas of interest and update prospect risks. Despite the challenges often associated with the Barents Sea, such as a complex overburden and large resistivity anisotropy, the producing Snøhvit Field is imaged as a CSEM anomaly with the correct burial depth and lateral extension. This shows that CSEM data can be an important exploration tool in the Barents Sea.
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Advances in Multigrid Solution of 3D Forward MCSEM Problems
More LessIn this note we concentrate on iterative solution of the linear algebraic systems resulting from the finite-difference discretization of 3D forward mCSEM simulation. We review and test a recently developed multigrid preconditioner to an iterative solver and introduce some changes into the smoothing scheme of the multigrid algorithm. We substitute the originally used symmetric multiplicative Schwarz smoothing scheme with that of additive Schwarz. We also found an approximately optimal value for the scaling factor needed for additive Schwarz smoothing. Our changes result in a faster and naturally parallelizable algorithm.
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Effective Calculation of EM Green’s Functions Applied to MCSEM Forward Modelling
More LessIn this paper, we present an algorithm for calculating Green’s functions and EM fields for a dipole transmitting source embedded in a layered homogeneous earth. We first set up a fictitious interface through the source parallel to layer boundaries. The EM potentials are continued upward and downward from the interface with continuity conditions, where the reflection coefficients are derived from the accumulated impedances or conductances. The source coupling is treated as a jump of boundary conditions at the fictitious interface. In this way, the source term in the mathematical formulation is separated from the propagation terms. This generalizes the algorithm for any form of electrical and magnetic transmitting dipole sources and simplifies the mathematical formulation and programming. We demonstrate the effectiveness of the technique by considering a horizontal electrical dipole as transmitter for marine CSEM forward modeling.
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Spectral Induced Polarization Measurements of Hydrocarbon-bearing Rocks and Fluids
Authors V. Burtman, M. Endo, T. Ingeman-Nielsen and M.S. ZhdanovAs part of our research into spectral induced polarization (IP) methods, we have measured the complex resistivity (CR) spectra of hydrocarbon-bearing rock and fluid samples from 0.1 Hz to 1 MHz using laboratory CR and dielectric spectroscopy equipment. Our rock-fluid samples included artificial and sandstone reservoir rocks saturated with synthetic oil, tap water, and distilled water. Our fluid samples included oil-based mud, tap water, and distilled water. Statistical analysis of our measurements conclude that hydrocarbon-bearing rock and fluid samples contain significant SIP responses; the mechanisms of which are only partially understood at present. Additional research is needed to clarify the different IP mechanisms in different frequency regimes, but we can conclude that it will be necessary to account for SIP effects when interpreting electromagnetic (EM) data for hydrocarbon exploration and formation evaluation.
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Study of the Inductively Induced Polarization of the Near-surface in Eastern Siberia by TEM Sounding
Authors S.V. Kompaniets, N.O. Kozhevnikov and E.Y. AntonovIn Eastern Siberia, the TEM sounding method has found wide use in studies of sedimentary basins, search and prospecting of oil and gas fields and ore deposits, and solving other geological problems. As a rule, TEM data are interpreted in the context of conductive non-polarizable geological media. In most cases it is a reasonable practice, but TEM data measured in some regions couldn’t be interpreted without regard for the inductively induced electrical polarization. The inversion of the TEM data in terms of 1D conductive polarizable earth model has shown that induced polarization effects are due to near-surface layers rather than to the deep ones. It some cases taking into consideration induced polarization effects provides insight into the nature of geological objects under study.
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Geostatistical Estimation of Different Interpolation Techniques
Authors Е.V. Kovalevskiy JSC and М.V. Perepechkin JSCВыполняется сравнение различных методов детерминированной и стохастической интерполяции скважинных данных. Показано, что воспроизвести в объеме среды и гистограмму, и вариограмму исходных скважинных данных очень непросто
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A Pre-processing Workflow for Multi-point Statistics Modelling Involving Training Image Construction and Well Validation
Authors P.J. Ruelland, C. Ronot, E. Wirbel, F.J. Laugier and P. Biverwells is enabled by “printing” into the simulation grid an appropriate 3D pattern of connected facies extracted from the 3D training image, after a full scan of the training image has been performed. Multiple-point simulation can be run using either stationary or non-stationary training images.
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