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2nd EAGE St Petersburg International Conference and Exhibition on Geosciences
- Conference date: 16 Oct 2006 - 19 Oct 2006
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73781-64-1
- Published: 16 October 2006
21 - 40 of 209 results
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Rock Properties of Complex Lithologies - Similarities Between Offshore Brazil and West Siberia
Authors O. Klarner, S. Klarner and B. UjetzRift related basins represent an important part of hydrocarbon bearing areas worldwide. In basins containing large flood basalts, volcanic rocks occur as major sediment source for potential reservoir sandstones. Examples from Cretaceous sediments in the Santos Basin, offshore Brazil, and Jurassic sediments in the West Siberian Basin are presented here. In contrast to pure quartz arenites, these sandstones contain a significant amount of feldspars, lithics and their diagenetic products which have a significant impact on reservoir properties. Although diagenetic products may preserve porosity at relatively deep burial, they normally reduce permeability and therefore production rates. The acoustic and elastic properties of the reservoirs are also affected. These types of complex reservoirs are rarely documented. Therefore, learning from case studies helps to understand similar reservoirs and to predict their properties in order to optimise exploration and production potential.
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The technology of integrated speed-spectral interpretation of filter-capacitor characteristics and petroefficiency of reservoirs in three-dimensional cross-borehole space petroefficiency of reservoirs in three-dimensional cross-borehole space
Authors M. Afanasyev, E. Kopilevich, E. Davydova, A. Petrov, A. Goncharov and J. AfanasyevaПрогнозирование ФЕС коллекторов в межскважинном пространстве производится по данным сейсморазведки и ГИС на основе их спектрально-временного и псевдоакустического преобразований с определением количественных спектральных по оси частот и времён атрибутов, а также псевдоакустической скорости. Эти сейсмические атрибуты сертифицируются по принципу наилучшей корреляции с ФЕС и интерпретируются комплексно с использованием искусственных нейронных сетей, на выходе которых распределение в пространстве удельной ёмкости и гидропроводности коллекторов.
Технология обладает патентной чистотой и успешно внедрена в сейсмогеологических условиях Западной Сибири и Тимано-Печорской НГП
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Modeling and Inversion of Sonic P and S Wave Velocities at the Mallik 5L-38 Gas Hydrate Research Well
Authors J.G. Rubino, C.L. Ravazzoli and J.E. SantosUsing an interval of real log data from the Mallik 5L-38 Gas Hydrate Research Well, we estimate empirical relations for some mechanical properties of the gas hydrate frame. This is an important problem for geophysical exploration in gas hydrate bearing sediments, a subject which has not received as much attention as it deserves from the researchers in this field.
The theoretical velocities used to model the sonic logs are computed using a Biot-type formulation combined with known petrophysical models for shaley sandstones.
The empirical results are also applied to obtain estimates of gas hydrate saturations at a different depth interval from sonic and density log data, showing the applicability of this approach.
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Authenticity of Hydrocarbons Deposit Prediction Rise on a Base the Integrated Model of Field
Authors A.P. Sorokin, S.O. Slobodyanyuk and V.V. SirchenkoAuthenticity of prediction of hydrocarbons deposit, at the searches and exploring of hydrocarbons reservoirs by geophysical methods, relies oninforming of every method in concrete geological condition and is characterized by the factor of definiteness 0
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Prestack Interpretation in Interpreter's Environment
Authors M.M. Popov, D. Mair and N. Xuan NamIn the conventional approach of interpreting stacked seismic, the goal of a prospect mapping is to define the geologic framework and stratigraphy. Correlating well data with poststack seismic attribute volumes provides some hints to possible hydrocarbon presence and reservoir quality away from wells. However these characterized volumes have already blended the seismic response of different offsets, and can be further distorted by the stacking process. To understand the composition of the framework that is lithology and pore fluid away from well control requires prestack interpretation.
For decades, interpreters have used poststack seismic volumes as their primary data type due. In contrast, prestack seismic data has been very difficult to access from a standard seismic interpretation environment, partly due to hardware limitations. Its use has been limited to specialists such as AVO experts and seismic processors. Nowadays, with access to affordable hardware providing sufficient disk space and memory to handle huge prestack datasets, the potential to work with prestack data exists. Most importantly, new geophysical tools permit everyday interpreters to view and analyze this prestack seismic data in an integrated interpretation environment.
This paper describes a case study whereby analyzing prestack data in the interpreter's environment helps to see clearly differences in the prestack response to hydrocarbon or water at the reservoir.
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Structure of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea - Insights from the New Aeromagnetic Survey JAS-05
Authors L. Gernigon, O. Olesen, J. Ebbing, J.O. Mogaard, C. Pascal, S. Wienecke, J. Mondt, O. Norvik, M. Sand and O. SteenIn order to better constrain the Cenozoic evolution of the Norwegian-Greenland Sea and contiguous margins, a new aeromagnetic data (JAS-05 survey) was acquired in the Eastern part of the Jan Mayen Fracture Zone during autumn 2005. We present preliminary results and interpretation of this survey. The main faults, structure and magnetic anomalies have been re-interpreted using a systematic comparison between bathymetry, gravity, magnetic patterns and available seismic data. Magnetic chrons have been identified and has been used to provide accurate Cenozoic ages for the oceanic basement and overlying sedimentary sequences, identified on seismic. The new magnetic survey and integrated study allow us to discuss the tectonic and magmatic evolution of the Jan Mayen Fracture Zone and its geodynamic implications
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Forecast of the Mineral-Raw Prospective Areas, That Is According to Results of Integrated Processing and Interpretation
Authors S.A. Kaplan, E.N. Cheremisina, A.S. Kireev, V.I. Galuev and S.S. MalininaThis paper presents the methodology of integrated processing and interpretation of research data on control geophysical profiles. The general scheme of integrated analysis of geological information is adduced. Methods of constructing environment models based on data from separated geophysical methods are represented, methodology of getting block-layered locally-homogeneous model of Earth’s crust is proposed. Results of forecast of favorable zones for formation of mineral deposits and conditions on Eastern Siberia and Far East profiles are represented
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The Geodynamic Model Central - Aldan of Region (CAR) and Prediction
More LessThe offered operation has allowed on the basis of a dynamic model Central - Aldan of region, using the program COSKAD 3D, to carry out prediction of plants under search operations on ore gold
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Deep Structure and Geodynamics of the Pre-Mesozoic Sedimentary Successions within the Northern West Siberia
Authors S.L. Kostyuchenko, V.A. Erkhov and V.Y. BulavinovThe data derived from deep CDP, DSS and conventional seismic study of the territory of Northern West Siberia give evidences to suggest different stages of evolution of the region. The plate tectonics took place up to the Middle Palaeozoic. The interaction of a mantle plume and earth crust causes the large-scale sedimentary basin formation during the Middle-Upper Palaeozoic. The rift occurred in the end of the Palaeozoic up to Early Triassic time, and after these, general subsidence of the lithosphere was resulted by formation of the West-Siberian sedimentary province. We conclude that, in the area of study, 4-6 km thick carbonate-terrigenous sedimentary complex exists beneath the Mesozoic to Cenozoic oil and gas bearing cover.
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Deep Structure of the Pre-Mesozoic Consolidated Basement of the West-Siberian Geosyneclise and “Deep” Geological-Geophysical and Geodynamic Factors of Hydrocarbon Deposits Localization.
Authors A.S. Egorov, V.N. Muchin, A.I. Atakov and E.Y. ErmolinResults of geological-geophysical modeling of the consolidated basement of the West-Siberian geosyneclise with the use of modern-day regional CDP seismic profiling data are presented. The estimation of potentialities of the multifactor prognostic technology with the aim of “deep” factors of hydrocarbon deposits localization is considered.
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Technology of MT Data Interpretation and Results Obtained at Geotraverses
Authors V.P. Bubnov, E.D. Aleksanova and A.G. YakovlevTechnology of magnetotelluric (MT) data interpretation and results of MT investigations along geotraverses in Eastern Siberia are considered. New information about resistivity structure of the sediments and consolidated crust was obtained. Thick conductive Riphean layers, supposed to be good collectors, were revealed in Irkenyevsky aulacogen and Tungusskaya syneclise. It is shown that in geoelectric conditions of Yeniseisky range MT method allows to study only the upper 10 – 15 kilometers. Two types of the Earth’s crust are determined within the Siberian craton. Crust of the first one contains crustal conductive layer and corresponds to hydrocarbon perspective areas. In the crust of the second type this layer is not developed.
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Seismography as Effective Problem Solving Method in Ore and Oil Geology and in the Siberian Earth's Crust Study
Authors A. Salnikov, V.L. Kuznetsov and V.M. MarkovДля повышения геологической эффективности сейсмических исследований, в том числе проведенных в прошедшие годы, предлагается использовать способ сейсмической томографии на временных задержках волн в первых вступлениях, зарегистрированных при работах методами отраженных и преломленных волн.
Для решения обратной задачи применяются специальные двухмерные временные поля, что позволяет объединить в единую систему времена прихода волн при наблюдениях разной детальности, в том числе при отсутствии корреляционной увязки отдельных годографов. В качестве интерпретационной модели принята непрерывная двухмерно-неоднородная модель.
Разработанная технология сейсмической томографии широко применяется при решении различных задач нефтяной и рудной геологии и при изучении глубоких зон земной коры Сибири: изучение самой верхней гетерогенной части земной коры в рудных районах, что позволяет прогнозировать новые рудные узлы и изучать их структуру; изучение структуры и строения, а в комплексе с данными бурения, и состава палеозойских нефтегазоносных образований в Западной Сибири; позволяет освещать внутреннюю структуру глубоких зон земной коры, обеспечивая выявление волноводов, зон дезинтеграции, глубинных разломов.
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Depth-Velocity Model Based on Regional Seismic Data
Authors V.V. Kasianov and I.U. KulakovaThe calculation of reflected compressional wave velocities based on regional seismic survey data for further depth conversion and the compressional wave field study aimed to identify blocks and areas in Yamal-Nenets autonomous district for detailed prospecting at insufficient deep drilling information.
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Which Parameters Control Seismic Attenuation in a Fractured Porous Rock?
Authors B. Gurevich, M. Brajanovski, R.J. Galvin and G. LambertTo analyse which parameters (fracture length, thickness or spacing) control the frequency dependence of attenuation and dispersion, we consider two theoretical models. The first model considers fractures as planes of weakness (or highly compliant and very thin layers) of infinite extent. In the second model fractures are modelled as thin penny-shaped voids of finite radius.
In both models attenuation exhibits a typical relaxation peak around a normalised frequency of about 1. This corresponds to a frequency where the fluid diffusion length is of the order of crack spacing for the first model, and the crack diameter for the second. This is consistent with an intuitive understanding of the nature of attenuation: when fractures are closely space, the waves reflected/scattered by cracks interfere with each other, with the interference pattern controlled by the fracture spacing. Conversely, if fracture length is smaller than spacing, then fractures act as independent scatterers and the attenuation resembles the pattern of scattering by an individual crack.
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The interpretation of petroefficiency of fractured reservoirs
Authors D. Reznikov, E. Kopilevich, E. Davydova, M. Afanasyev and A. PetrovПрогнозирование коэффициента нефтепродуктивности трещинных коллекторов производится по данным сейсморазведки МОГТ, ГИС, испытаний скважин на основе количественных спектрально-временных и псевдоакустических преобразований сейсмических преобразований сейсмической записи и кривых ГИС с последующим интегрированием спектрально-скоростных атрибутов с использованием искусственных нейронных сетей для определения коэффициентов емкостной дифференциации (КЕД) глинистых трещинных коллекторов, интегральной удельной емкости (q) карбонатных трещинных коллекторов КЕД и q коэффициента нефтепродуктивности Кнпр = Q/Δp, где Q – дебит нефти, Δp – перепад давления в скажине. Технология обладает патентной чистотой и успешно внедрена в сейсмогеологических условиях Западной и Восточной Сибири.
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PS-Wave Azimuthal Anisotropy in a North American Carbonate Basin
Authors S. Roche, B. Mattocks, J. Li and S. RonenIn an onshore example from a US carbonate basin, an embedded multicomponent test exhibits good PS-wave signal quality at the depth of interest, and all the expected characteristics of converted waves in azimuthally anisotropic media. In particular, there are clear azimuthal polarity reversals on the transverse receiver component, separated by null amplitudes defining the symmetry planes of the natural coordinate system; azimuthal velocity variations on the radial component then distinguish the specific symmetry plane aligned with maximum horizontal stress. The cumulative anisotropy is in good agreement with regional horizontal stress from borehole breakouts.
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Applying the Side-View Seismic Location Method (SVSL) in Complicated Geological Conditions
Analyzed are results of applying the Side-View Seismic Location method (SVSL) in combination with other seismic methods to solution of main problems of HC exploration in complicated geological settings of Orenburg region and Kuyumba oil field in East Siberia. Combination of SVSL and other seismic methods (CMP) allows solve such problems as building a structural model, mapping of fractured zones and fluid migration pathways. By way of examples considered is solution of these problems for the south of Cis-Ural through, particularly, for the Akobinsk area featuring a material effect of salt-dome tectonics. The second part of the paper presents results of applying SVSL to mapping the open fracturing of rocks, refining the geological model of Riphean complex of East Siberia (Kuyumba oil field) in combination with the structural seismic (2D CDP), and identification of fractured zones which are promising drilling targets. Proposed is a technique for identifying reefogenic structures in the depth interval of Riphean complex. This allows substantially improve the reliability of geological predictions when selecting optimal drilling sites to achieve maximum oil flow rate in exploratory wells.
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Noise Amplitude Analysis of Collocated VectorSeis and Geophones Groups
More LessОдним из требований, предъявляемых заказчиком работ к качеству полевого материала, является контроль максимально допустимого уровня случайных шумов (до первых вступлений) на профиле. В большинстве случаев максимально допустимое значение шума для данной площади обычно известно либо по результатам предыдущих работ, либо по результатам предварительно проведенных опытных работ, и задается в микровольтах.
В последнее время все большее распространение начинает получать сейсморазведка с использованием точечных многокомпонентных цифровых акселерометров. Главным отличием данного метода является регистрация полного волнового поля и отказ от группирования сейсмоприемников.
Многокомпонентный цифровой сейсмоприемник представляет собой акселерометр, регистрирующий ускорение, в отличие от стандартного геофона, измеряющего скорость смещения частиц грунта. Вследствие этого при работе с акселерометрами нельзя использовать максимально допустимый уровень шумов, рассчитанный для групп геофонов. Часто, при применении акселерометров на конкретной площади мы не имеем достаточного количества статистических данных для определения уровня шумов в микрогалах. В данной работе исследуется возможность использовать для определения этого уровня максимальный шум групп геофонов.
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Time Processing of Multicomponent 3D Survey Acquired in West Siberia, Russia
Authors Z. Tlemissova and D. YanchakMulticomponent data acquired by TNK-BP in 2005 was the first 3D/3C survey shot in West Siberia, Russia. This study covers the main issues and challenges of the 3C processing and the behavior of PS waves in the subsurface geology of West Siberia as compared to P waves.
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Use of a Vertical Component of Seismic Shear Waves
Authors YU.P. Bevzenko and V.A. ZozulyaWide-scale implementation of multi-component seismic exploration is constrained by subsoil users’ doubt in its efficiency due to lack of information acquired in field conditions and confirmed by drilling and field operation results. In such situation shear & converted wave data obtained in the process of conventional seismic exploration with monotype P-waves is useful to justify multi-component seismic prospecting. The most favorable conditions for studying a vertical component of shear and converted waves are found in prePolar areas with a high-velocity 500 m thick permafrost layer on a surface of the interval under study. Use of additional information allows to define requirements to projects of multi-component seismic exploration performed using borehole explosions and nonexclusive sources of a vertical action, as well as, in some cases, solve geological tasks at relatively shallow depths. A result of the research works performed since 1997 is a recommendation to realize a rational land multi-component 2D seismic exploration based on a highly-mechanized 3-component telemetric system “MarshLine” being manufactured by a Russian company “Sea Technology” for working in transit zones.
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