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6th EAGE Saint Petersburg International Conference and Exhibition
- Conference date: April 7-10, 2014
- Location: Saint Petersburg, Russia
- Published: 07 April 2014
1 - 20 of 174 results
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Detailed Geological Modeling of Precambrian Fractured Reservoirs and Estimation of Their Oil Reserve Properties
Authors V.V. Kharakhinov, S.I. Shlenkin, V.A. Zereninov, O.M. Koulishkina, M.V. Berin and O.V. RydSummaryThe paper describes technology of fractured carbonate reservoirs geological modeling based on integrated analysis of 3D seismic and well data. This technology allows us to predict the most productive zones in the reservoir and to use this information for the oil field development.
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Integrated Approach to the Development of Geological Models of Fractured Carbonate Reservoirs in the Timan-Pechora
SummaryThe paper describes an integrated approach to geological modeling of complex carbonate reservoirs (of fracture and fracture-pore type) in Timano-Pechora province. This approach allows us to refine the structure and properties of oil-and-gas deposits in the middle Ordovician – early Devonian strata.
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Fine Structure Reconstruction of Cavernousporous Reservoirs Based on Scattered Wavefield Interpretation
Authors A.S. Merzlikina, V.S. Nefedova, V.A. Pozdnyakov, A.A. Tuzovskiy, V.A. Tcheverda and V.V. ShilikovSummaryThis paper presents the original technique of fine structure reconstruction, based on the scattered wavefield processing. In particular, the implementation of this technique to cavernous-porous reservoirs is discussed. The main features of this approach are: full-scale numerical simulation; object-oriented migrational transformations; integral operators for true-amplitude wavefield continuation
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The Special Method of Processing of Scattered Waves and Its Use in Eastern Siberia
Authors A.A. Kozyaev, K.O. Matrosov, A.S. Merzlikina and V.V. ShilikovSummaryIn carrying out such expensive works as seismic survey, it is advisable to try to extract the maximum benefit from it , for this reason , the main trend in modern seismic survey is to try to increase the volume of useful information extracting from raw data. One way to increase this volume is the study of the scattered wave field component, which carries information about the internal structure of the study area. For the selection of scattered component from full seismic field energy, is proposed to use a special technology of focusing transformations. This report presents an example of application of this technology in one of the licensed areas of Eastern Siberia. The main feature of this area is the presence of a dense network of small blocks faulting on the background of regional faults. As well to increase the signal / noise ratio was used a special processing of the results. During the work were identified interesting anomalies, which are described at the report. As a result were obtained the schemes of energy distribution of the scattered waves, that allow identify in the study area the most promising areas for hydrocarbon exploration.
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Uncertainty Quantification with Application of Distance Metric in Naturally Fractured Reservoirs Modelling
Authors K. Gopa, V. Demyanov, M. Ahmed Elfeel and D. ArnoldSummaryCharacterization and modelling of naturally fractured reservoirs (NFR) is usually complicated with very high degree of heterogeneity and uncertainty related to fractures. A commonly used framework for uncertainty estimation such as Monte-Carlo modelling is straightforward but in case of NFR is highly time-consuming as it requires generation of a large number of realizations and their flow simulation. We propose a more efficient method in terms of time cost, for uncertainty estimation in NFR flow performance. The idea of the method is to select a subset of reservoir models reflecting the same uncertainty range in flow response as the full set. The large set of NFR models is generated capturing the variability of fractures parameters. We calculate Euclidean distance between flow responses obtained from results of fast but not accurate flow simulations and apply multidimensional scaling to map realizations into some space representing spatially their uncertainty. Grouping similar realizations in clusters we find those realizations which are located in their centers and hence the most different. Once the most diverse realizations are obtained, an accurate flow simulation is run and uncertainty is quantified using only selected small subset of realizations. We demonstrate the workflow on the synthetic but realistic example.
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Fractured Basement Characterization and Its Relation to Production Zone Potential in Southern Sumatra Basin, Indonesia
Authors A.B.S. Samudra, S. Sugiri and M.W. WahyudinSummaryPT. PERTAMINA EP in 2009 drilled AXL-1 in South Sumatra Basin and discovered oil in Pre-Tertiary Quartzite at AXL Area, South Sumatra, Indonesia. The well was drilled and reached Quartzite basement at 2254 mMD with no indication of hydrocarbon based on gas reading but after 204 m, total gas suddenly reached 1401 unit with hydrocarbon indication from nC1 up to nC5 at 2458 mMD and subsequently crude oil was bleeding in the shale shaker and flowed oil up to 320 BOPD. Geological and Geophysical analysis were conducted and modeled to characterize fractured basement reservoir in the Pre-Tertiary rocks in the AXL area related to its production zone potential. Fractured basement lithology in the AXL area is quartzite with volcanic mineral exist and minor secondary mineral which indicated fluid flow in the reservoir. Faults and micro-faults were observed and demonstrate dominant NE-SW strike with abundant conductive fractures with strike dominant NE-SW with minor NW-SE. Based on integrated fracture analysis in AXL area, production hydrocarbon potential zone along the basement section maybe related to multiple fracture orientation which build a fracture network for fluid to flow and it is related to the fault system in the Pre-Tertiary basement rock.
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Analysis of Anisotropy Parameters of Fractured Carbonate Reservoir
Authors Y.A. Alkhimenkov and I.O. BayukSummaryRecently unconventional reservoirs attract more and more attention in prospecting geophysics. Unconventional reservoirs often exhibit anisotropic physical properties due to specific features of their microstructure and texture. In the work a theoretical modeling of effective elastic properties of such a reservoir - fractured carbonate rock of low porosity - is considered. Commonly fractures in the reservoirs are sub-vertical which leads to HTI symmetry of the rock. Elastic constants of the carbonate reservoirs are calculated with the help of different approaches of the effective media theory: generalized singular approximation, Hudson’s model and Eshelby-Cheng model. The purpose of this work is estimation and analysis of small-anisotropy Thomsen’s parameters of fractured carbonate reservoir, examination of applicability of the parameters to predict elastic wave velocities in different directions and comparison of the results provided by different theoretical approaches.
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Fracture Imaging by Weighted Summation of Multi-component Data and Image Spectrum Analysis
Authors M. Protasov, V.A. Tcheverda and G.V. ReshetovaSummaryAn approach to seismic imaging of fractures by multicomponent surface data is presented and discussed. It is based on a specific imaging procedure, which consists in a weighted summation of multicomponent multishot/multioffset data. These weights are computed by tracing a specially chosen Gaussian beams. In order to get image of fractures these beams are taken in a way forming so called selective images (Pozdnyakov and Tcheverda, 2006; Protasov and Tcheverda, 2011). Their geometry provides suppression of regularly reflected waves and, thus, emphasizes the presence of small-scale heterogeneities that give rise to diffracted/scattered waves. Additionally spectral removal is applied for more essential suppression of regular reflections footprint.
Numerical experiments with synthetic data set computed for the typical seismogeological model of Yurubcheno-Tokhomskoye area are presented and discussed.
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Low Frequency Anomalies below Gas Reservoirs - Possible Explanation
Authors G.M. Goloshubin and E. ChabyshovaSummaryWe consider a possible explanation of the seismic low frequency anomalies using converted Fast-Slow- Fast P- waves in a thinly layered porous permeable fluid-saturated medium. Wave propagation in highly interbedded permeable gas reservoirs suggests significant and anomalous amount of mode conversions between Fast and Slow P-waves, which may be observed from surface seismic reflection data. Those converted P-waves experience high frequency dependent attenuation. In case if some converted waves propagated only a short fraction of their travel paths as Slow P-waves they will be notably delayed and attenuated relative to Fast P-wave reflections. A model of sandstone reservoir with typical parameters is used to estimate time delays of the converted Fast-Slow-Fast P-waves and their influence into total reflected P-waves energy at seismic frequencies.
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Introducing Ji-Fi - Joint Impedance & Facies Inversion
Authors M.A.C. Kemper, K. Waters, A. Somoza, A. Pelham and A. KozhenkovSummaryIn this paper we introduce Ji-Fi, a new Joint Impedance & Facies Inversion system, which gives a significant increase in quality over model-based Simultaneous Inversion, because it incorporates the correct physics! We first review Simultaneous Inversion, then introduce Ji-Fi and compare one against the other, first with a wedge model and then using a case study.
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Joint Inversion of Multi-type Geophysical and Geochemical Data for Hydrocarbon Systems Exploration at Sea Shelf
SummaryThe possibilities of the joint inversion of the modern multi-type geophysical (3D seismic, gravity & magnetic and electromagnetic) and geochemical data sets are demonstrated for the purposes of the oil-andgas- bearing capacity estimation and geological risk assessment in the sea shelf areas where no well logging information and other priory constraints are available. Methods, algorithms and software are developed for the construction of the coordinated 3D models of the media physical properties. The utilisation of the density model (as obtained from gravity data) as the low-frequency model for seismic inversion is suggested and demonstrated. It is shown that the joint inversion of seismic and magnetic data helps to authentically differentiate between carbonate reef and buried volcano structures. The regular links are ascertained between bottom sediments hydrocarbon gases concentration and structural and tectonic characteristics of the sub-surface that become apparent in seismic attributes. The method for the qualitative estimation of the hydrocarbon reservoir depth is developed based on the modelling of the gases filtration from reservoir to the surface. The principles are suggested for the recognition and prospectivity estimation of the oil and gas complexes from the joint analysis of the different data types.
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Petrophysical Investigation for Selecting Seismic Inversion Type (Yamal Gas Condensate Field Case Study)
Authors A.A. Popravko, T.F. Sokolova and V.I. KuznetsovSummaryNowadays seismic inversion techniques are widely used for quantitative reservoir characterization. The petrophysical basis for seismic inversion is data of the rock elastic properties which are a result from theoretical and empirical modeling namely Rock Physics. Completeness and quality of the initial well log data are crucial for building reliable reservoir model based on seismic data. The selection of inversion techniques strongly depend on acoustic properties in a target interval. This analysis was performed in multidimensional space of density and compression shear velocities. This paper shows the Rock Physics modeling results for inversion type selection estimation in order to build 3D model of gas-condensate saturated.
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Reservoir Properties Characterization Using Simultaneous AVO/AVA Inversion at the Exploration Stage
Authors I. Iakovleva, A. Popravko, P. Ponomarenko and Z. GazaryanSummaryInvestigation of new exploration objects assotiated with number of difficulties. The main problem of this study is the presence of limited information both seismic and well logs. In this case for reservoir properties prediction seismic attributes analysis and AVO analysis are typically used. However, application of seismic inversions, even in early stages of the fields study, allows to get additional information about reservoir properties.
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Consideration of Velocity Anomalies During Seismic Inversion
Authors O. Belashov, G. Lecant and S. BaptisteSummaryБлагодаря повышению соотношения сигнал/шум и расширению частотного спектра, результаты инверсии обладают большей разрешающей способностью. Оптимизация процесса увязки сейсмических и скважинных данных мы получаем наиболее достоверное контроль над результатами инверсии
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The Problem of Incomplete Prior Information in Stochastic Inversion
More LessSummaryOne of the main problems that always remains unresolved within the framework of the inverse problem is the prior information. In this pages represent analysis of the problem that arises when using stochastic inversion on the object wich, not described of prior information, but is clearly associated with a geological body by seismic data. The existence of complex geological objects with indirect morphological features, as well as the development of methods for their isolation allows a fresh look at the problem of prior information in the framework of solving the inverse problem and the character of seismic information.
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Comparison of Different Approaches for Seismic Driven Geostatistical Modeling
More LessSummaryThe importance of using all available information for seismic driven geostatistical modeling, advantages of sesimic driven geostatistical modeling namely geostatistical inversion with multi-level discrete properties models is demonstated in this paper.
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Terrigenous Reservoir Structure Elaboration and Risk Assessment Using Geostatistical Modeling Controlled by Seismic Data
Authors E. Zadorina, V. Bykov, L. Markelova, I. Grigorenko and M. KrylovaSummaryThis article demonstrates using geostatistical modeling controlled by seismic data as one of the best way to predict reliable reservoir properties distribution under the conditions of its significant lateral variations wherein the thickness is quite small. Also it shows the realizations ranking and the initial geological model updating by separating one more prospecting layer. What is more the risk assessment has been done for different uncertainty origin.
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Object Modeling and Prediction of Well Rates in Tide Domintated Delta Reservoir, Field N, Russia
Authors S.A. Sizykh, V.S. Rukavishnikov, A.S. Bochkov and B.V. BelozerovSummaryField N is situated in Yamal peninsula in Western Siberia. From 19 productive layers, J3-4 layers are the most important for consideration as they contain significant amount of STOIIP. On base of complex analysis of core data and paleogeography, depositional environment of J3-4 layers was defined as tide dominated delta. Sandbodies are presented by channel facies and also by interdistributary facies, formed by levees and crevasse splays. Qualitative and quantitative analysis of log data allowed creation of input data for geological model. 3D facies model was obtained using combination of object modeling and sequential indicator simulator methods. Properties in model were obtained with use of random simulation function and various recalculations. Geological model was transformed into simulation model. Uncertainties, related to sandbody dimensions, model realizations and sandbody distribution in tested well were evaluated using numerous realizations of geomodel. Cumulative oil recovery and rates were evaluated for horizontal and vertical wells, using P10 P50 P90 values.
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Methods for Assessing the Quality of Seismogeological Models
By A. NikolaevSummaryThe report describes a systematic approach to the construction of stochastic geological and hydrodynamic models based on the results of seismic inversion. Using the results of stochastic inversion can improve the quality of the geological model , giving an idea of areal and volumetric distribution of permeability and porosity of the formation. But especially important to determine the criteria for the presence of the reliability of the geological model. Such criteria , in our opinion may make the data field development , that is, to assess the validity seismogeological model should build a hydrodynamic model and to evaluate the convergence of the calculated and actual performance. Well the advantages of such an approach to modeling manifest in the performance of integrated projects , where the inversion results fall into the geological model, which becomes the basis of the filter model.
Our company has accumulated experience in building projects stochastic geological and hydrodynamic models based on the results of seismic inversion.
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Rapid Determination of Optimum Wettability Alteration Radius for Gas-condensate Reservoirs
Authors S. Aghabozorgi Nafchi and A. KhormaliSummaryThe optimization in wettability alteration process is limited to the work of Zoghbi et al. (2010) and Fernandez et al. (2011). Although there are few investigations on the effect of treatment radius (Zoghbi et al, 2010), there is no reported data for the optimum wettability radius determination. In this paper a rapid method for prediction of optimum radius is presented and the effect of the wettability alteration radius on the cumulative gas production is investigated. A simulator has been developed based on the method suggested by Mott (2002) and the accuracy the simulator is verified by Eclipse (Schlumberger) software for different compositions. This developed simulator has been used for calculating the capillary numbers near the wellbore region before wettability treatment. The calculated capillary numbers are plotted verses a function of radius, based on the developed theory suggested by the authors, that relates the capillary number to radius. This method was applied for 27 synthetic reservoirs and the results were used for determination of optimum treatment radius, above which the increase in gas production is not significant. The optimum treated radius determined by this rapid method was in a good agreement with optimum wettability alteration radius based on the compositional simulations.
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