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3rd EAGE St.Petersburg International Conference and Exhibition on Geosciences - Geosciences: From New Ideas to New Discoveries
- Conference date: 07 Apr 2008 - 10 Apr 2008
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73781-52-8
- Published: 07 April 2008
21 - 40 of 193 results
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Processing Seismic Data Based on the Instant Signal Parameters
Authors I.N. Busygin, S.P. Popov and I.A. GontarenkoIn this paper we are stating conception of seismic data processing using based on vari-ous of instant amplitudes, phases and frequencies. Such way providing by information equiva-lence of signal and it’s instant characteristic. Visual observability and locality of instant pa-rameters allow to build the flexible and time-dependent nonlinear procedures which are oper-ated on the basis of “visual” features of wave field. Simplicity in realization and management of processing differ this approach from wavelet and Fourier analyses of seismic data. In the context of this conception the set of processing procedures was formed. Linear transformation of instant frequency uses for increasing wave direction adaptation of multi-channel procedures and resolution of seismic data. Transformations of amplitude and fre-quency instant parameters uses in amplitude and frequency noise cancellation. Amplitude transformation with saving phase characteristic allow to create signal compression filter and to combine parametritic and wave information on a section. Instant vector which build on temporal and spatial instant frequency uses for correlation waves and adaptation algorithm to wave fields feature. Instant phase adaptive correction filter increases coherence seismogram but don’t distort it dynamics.
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Automatic Suppression of Acquisition Footprints in Seismic 3d Data
Authors A.V. Masjukov, V.V. Masukov, V.I. Shlyonkin and G.V. TararinNew technique for automatic suppression of footprints connected with acquisition geometry of 3D surveys is developed. The algorithms are based on footprint rejection in wave-number domain of seismic cube horizontal slices. Importance of acquisition footprint attenuation in geophysical interpretation and prediction of reservoir properties is illustrated and discussed.
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Multifocusing - Effective Processing Method for Development and Exploration
Authors A. Berkovitch, I. Belfer and V. MeshbeyAuthors developed and implemented a new method of seismic data processing, Multifocusing (MF). MF is based on the theory of homeomorphic imaging and consists of stacking seismic data with arbitrary source-receiver distribution in the vicinity of the central point. The new formula of the moveout correction is determined. This correction is based on a local spherical approximation of the reflection wave front and the dynamic ray tracing. MF does not require any knowledge of the subsurface model and produces an accurate zero offset section, even in cases of a complex geological structure, low signal to noise ratio and low fold data. An estimated set of parameters, namely the emergence angle and radii of curvatures for two fundamental wavefronts that define the local moveout correction, contains important information regarding the subsurface model and can be used for deep analysis of geological media. MF application is illustrated by a case study of real data processing.
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Approach to Cherent Nise Attenuation in Case of Insufficient
Authors V.I. Logovskoy and A.E. HaritonovОписан подход к подавлению низкоростных волн помех при недостаточной частоте пространственной дискретизации. Данные разделяются на частотные диапазоны, в каждом из которых используется свой алгоритм фильтрации.
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Wavefield Extrapolation for Prestack Time Migration with Rms Velocity
By D.D. NegutA wave-equation based summation (WESUM) algorithm has been developed (Pan, 2006) for prestack depth migration with flexibility and option to output common image gathers in the offset domain. In this abstract we demonstrate the application of WESUM for prestack time migration (PSTM) with rms velocity as opposed to running usual wave equation migration (WEM) using interval velocity. Just as in Kirchhoff PSTM, at each individual image point, WESUM performs constant velocity migration so that it can be used to conduct velocity analysis. In addition, the WESUM uses real source and receiver locations and thus can handle 2D crooked line.
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Complex Velocity Model Reconstruction on the Base of Seismic Tomography and Kinematic Migration
Authors YU.V. Roslov, A.A. Vinnik, A.V. Kopylova and N.N. EfimovaВ настоящей работе предлагается формализованная схема кинематической обработки, представляющая собой, в некотором смысле, аналог процедуры миграции до суммирования, используемой в МОВ-ОГТ. Основная идея метода состоит в комбинировании томографических и миграционных процедур с целью построения слоисто-неоднородной модели среды со сложнопостроенной геометрией отражающих/преломляющих границ.
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The Earth's Crust Deep Structure Along the Transect 2-Dw "Magadan - Southern Kurils" in the Okhotsk Sea
Authors T.S. Sakoulina, I.M. Tikhonova, N.A. Krupnova and N.I. PavlenkovaКомплексные геофизические исследования на акватории Охотского моря вдоль опорного профиля 2-ДВ–М с целью создания современной модели глубинного геологического строения Охотоморского шельфа включают сейсмические исследования: ГСЗ, МОВ ОГТ, сейсмоакустическое профилирование, а также гравимагнитные наблюдения. В настоящей работе основное внимание уделено методике обработки сейсмических данных и построения скоростных моделей, а также приведены новые сведения о глубинном строении центральной части Охотоморского региона.
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Stability of Estimates of Model Parameters Obtained from Reflected Wave Traveltime Curves by Means of the Adaptive Method
Authors V.A. Kochnev and P.A. ZvyaginThe paper presents the results of a stability research of estimates of model parameters and static corrections, obtained from reflected wave traveltime curves by means of the adaptive method. The method consists of two main procedures, applied iteratively to the initial estimates. First, current values of parameters are updated according to the difference between actual and estimated traveltime curves. Then the updated values are evened out by using gradient-based local approximation. The adaptive method is used to obtain a stable solution for the inverse traveltime problem of the seismic reflection method. It takes about 6 seconds of machine time to estimate 959 model parameters based on 14767 non-linear equations.
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Methods of Coherent Noise Attenuation by the Example of 3D Survey in Timano-Pechorian Province
More Less3D seismic investigations and producing qualitative data in Timano-Pechorian province complicated by near surface conditions of the area. Essential heterogeneity of upper part of section produce amplitude anomaly and coherent noise. Attempts to reduce negative effect of near surface heterogeneity if field and on the step of processing keep actual. In this work considered a few methods of coherent noise suppression, such as surface wave noise attenuation, f-k-filtering, "zone" filtration and then tested on the data. Technic of "zone" filtering in cone gives good results to ground roll attenuation, but cuts frequency component, with using this filter possible to prepare data for procedures for velocity analysis and static corrections. F-k-filtering helps to suppress linear coherent noise, but effect of aliasing makes difficulties for ground roll attenuation and can't be used
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The First Experience of Seismic Study of Shallow Water Zone on the Pechora Shelf
Authors B.S. Sambuev, S.G. Shramko and B.E. ChuvashevWe present the method for the decision of a problem of a choice of the optimum method of seismic in a shallow (transit) zone of the Pechora Sea being part of the Arctic shelf of Russia. Ours more than 30-year's experience of seismic in the North of Timan-Pechora oil and gas province in conditions of a severe Arctic climate, allows proving the optimum method. The basic achievement is conducting seismic acquisitions on land and in shallow water, in winter and summer time, with the account all of growing attention to ecological aspects of field seismic. The tendered method of application provides reliable coordination of the marine and land data, which favorably distinguishes it from earlier used.
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Structure Features of the East Siberia Paleozoic Complex Based on Results of Seismic and Well Log Data Interpretation
By I.A. NagaevaIn this work a complex approach to study a Paleozoic base structure of the West -Siberian plate is considered. The area of research is dated to Nurol trough in the tectonical plan. And despite of a significant level of exploration maturity by various geophysical methods and drilling, there are many questions and unresolved problems. Even such a question as a correct mapping of pre-jurassic surface remains opened till now as the roof of a Paleozoic section is changed by a paleodenudation so that their acoustic properties come nearer to the horizons of the bottom Jurassic complex. Also a seismic picture is complicated by a great number of various amplitude and extent tectonic deformations and the phenomena of an interference connected with discordant bedding of Jurassic sedimentary formation on the Paleozoic base. To create an authentic geological model of reservoir structure, detailed interpretation of 3D seismic data combined with geophysical logging data was required. This interpretation includes structural, paleotectonical, seismic and facial and dynamic analysis of the data being interpreted. The results of the analysis allowed to relate a certain regularity in forming a Paleozoic complex and reveal the most perspective areas of oil deposits.
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New Technology for Using 3D seismic Interpretations for Object Based Stochastic Facies Modeling
Authors G. Sarkisov and E. MakarovaВ докладе описывается технология, позволяющая использовать результаты выделения геотел и фациальных зон по данным 3D сейсморазведки при трёхмерном объектном моделировании осадочных фаций
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Net Sand Determination / Facies Modeling for Development Geological Study
More LessThe Lirik Field is located in Japura Block, Central Sumatra Basin, about 145 km to the southeast of Pekanbaru, and about 195 km northwest of Jambi. Geologically the Lirik Field is part of the Japura complex structure. This field was discovered in 1972 and by the end of year 2006, the cumulative oil production reached 40 MMBO and the remaining reserve is about 5 MMBO respectively. Some efforts to optimize the existing production have encountered some problems such as: high water cut and sand distribution. The aim of this paper is to share how to solve the sand distribution problems in this area by using 3-D Application Modeling software.
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Technology and Methodical Principles Volumetric Geo-gravitational Modeling in Conditions Insufficiently Investigated
Authors A.I. Kobrunov, S.V. Shilova and V.E. KuleshovСовременная геофизика на сегодня испытывает информационный кризис. Это связано с огромным количеством программных продуктов, где за красочной визуализацией нередко теряется содержательная сторона получаемого результата, а построение комплексной модели строения изучаемой среды зачастую носит качественный характер. В настоящем докладе продемонстрированы разработанные теория, методы и компьютерные технологии, основанные на совместном решении обратных задач геофизики с целью изучения сложно построенных тектонических зон в условиях недостатка исходной информации
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Influence of the Terrigenous Reservoir Facial Heterogeneity on Processes of Oil and Gas Fields Development
More LessIn the article new technique for evaluating porosity-permeability properties of the clastic reservoir matrix are suggested. This technique bases on four types of porosity-permeability heterogeneity. Relations between allocated types and conditions of the formation forming process are described. Influence of these types on oil and gas fields development processes is showed. Aspects of the formation exploitation characteristics based on using of potential abilities of the allocated types are described.
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Simulation Aspects of the CO2 Flooding, Sensitivity and Case Study
Authors R. Berenblyum, G. Calderon, L. Kollbotn and L.M. SurguchevThis paper combines the knowledge and experience accumulated in IRIS over past years from several case studies involving Tjelbergodden CO2 value chain, Ekofisk and Gullfaks CO2 injection compositional simulations. The paper discuss importance of representing physical effects in modelling miscible and immiscible CO2 injection in sandstone and carbonate reservoirs. The following effects are evaluated: • Transfer of CO2 from fracture into the matrix involving diffusion and gravity segregation; • Viscous effects and formation of low and high concentration hydrocarbon phases; • Compositional effects and oil swelling; The sensitivity and importance of these effects are studied on several simplified mechanistic models and later applied to actual field cases. The detailed overview of viscous fingering effect will be presented. Results from the mechanistic study of the CO2 matrix-fracture transfer will be presented. The paper also discusses aspects of Equation-Of-State (EOS) modelling and PVT studies necessary. Case studies of the CO2 and CO2-WAG IOR methods for the reservoirs on the Norwegian Continental Shelf (NCS) will be presented. Oil recovery potential of these IOR processes will be discussed.
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New Technology of Structure Framework Modeling for the Deposits with Complex Faulting
Authors Anton Sungurov and G. SarkisovВ докладе описывается новая технология структурного моделирования месторождений, позволяющая существенно повысить адекватность и точность структурных моделей объектов со сложным тектоническим строением.
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Seismic and Geologic Characteristics of Lithologic and Stratigraphic Traps in the North of West Siberia
By O.A. KulaginThis paper is devoted to investigation of Early-Jurussic transgression basal horizon and prediction of different kinds off oil and gas traps near boundaries development lover Jurussic stratigrafic horizons. Also new seismogeological data related to Pre-Jurussic sediments in large Paleozoic pressure drawdown are presented.
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Integrating Geological and Reservoir Engineering Well Data to Predict Fracture Productivity - the Kuyumba Case-history
Authors L. Mattioni, V. Ryabchenko, E. Sokolov, R. Mukhametzyanov, V. Zereninov and I. BobbIn this paper, a geological and reservoir engineering approach aimed to analyse and model fractures in subsurface-fractured reservoirs is proposed using the complete geological and reservoir engineering record of well data such as cores, borehole images, wireline logs and well tests. This methodology is applied to an exploratory vertical well drilled in the hinge zone of a large asymmetric anticline fold, in the central part of the Kuyumba oil field in Eastern Siberia, Russia. Here, the reservoir succession is mainly made up of fractured tight dolomites of Precambrian age, with apparently no matrix contribution. As a result of this analysis using well data, a 3D Discrete Fracture Model (DFN) was set up around the studied well. Using this both statistical and deterministic approach, the vertical lithological variation at the well(s) and the interrelationships between fracturing at well scale, petrophysical heterogeneity and reservoir deformation can be quantified, thus allowing to build a well constrained and more realistic DFN. This latter has been used to assess the hydraulic properties of fractures, which will serve in future as input to simulate the flow conditions during different production operations.
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Study of the AVO Effect from a Fractured Carbonate - A Physical Model Study
Authors R.W. Wiley, B.C. Golden and G.M. GoloshubinThe increasing demand for hydrocarbons requires improved techniques for locating traps and reservoirs. With many of the oil and gas reservoirs being in fractures, it is of interest to develop new methods for locating these fractures and for determining their orientation and crack density. Recently several theories have been put forth on the variations of P wave reflections with offset across a set of fractures. To test these concepts, the Allied Geophysical Laboratory (AGL) at the University of Houston (UH) constructed a physical model of a fractured carbonate reservoir and acquired seismic data over this model. These data were then processed and analyzed to determine what amplitude variations occurred with the varying offset.
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