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4th EAGE St.Petersburg International Conference and Exhibition on Geosciences - New Discoveries through Integration of Geosciences
- Conference date: 05 Apr 2010 - 08 Apr 2010
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73781-79-5
- Published: 04 May 2010
201 - 210 of 210 results
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The Dynamic Acoustic Inverse Problem in Laterally Homogeneous Media
Authors D.V. Anikiev, A.S. Blagovestchenskii, B.M. Kashtan and W.A. MulderInverse problems are ubiquitous in many fields of science and can only be solved directly in very specific simple cases. There are many kinematic and dynamic inverse solution methods that require a good starting model to be able to proceed to a correct reconstruction. We investigated the application of the Gelfand-Levitan method to the problem of finding acoustic parameters from seismic data. The method allows for a direct reconstruction of the model from the data if the medium is laterally homogeneous. A synthetic numerical example shows that we can reconstruct a smooth version of a given 1D model up to a predictable depth for typical marine data that include multiples.
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Study of Fractures in a Permeable Rock Matrix using Two Phase Numerical Flow Model–Effect on Relative Permeability Curve
Authors I. Oraki Kohshour and B. HabibniaThe presence of open fractures in a permeable matrix generates highly heterogeneous permeability fields which have a large impact on the relative flow of oil and water. This results in highly variable velocities which generates complex oil-water fronts and strongly heterogeneous water saturation fields. Such conditions makes prediction of reservoir behaviour difficult and efficient recovery problematic. One of the best known effects is early water breakthrough at wells due to the preferential flow of water along a connected fracture system. In the present paper the effects of open fractures on the flow of oil and water are investigated using a two phase numerical flow model with some simple and simulated and natural fractures patterns. The results are used to investigate the nature of ‘pseudo curves’ (relative permeability curves for volumes of heterogeneous rock) in the case of fractured permeable rocks. And we will get a important result that increasing fracture aperture beyond a critical value does not significantly alter the pseudo relative permeability curves resulting in flow channeling and thus affects production.
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Choosing a Priori Model for Seismic Invertion
More LessThe new approach to geological model parameterization introduced. Building the model based on “in layer gradient parameter variations” method, consider with direction and rate of the lithological properties variations, allow to obtain the improved seismic velocity model. That seismic inversion result will highlight the important details and characteristics that can be very useful on reservoir property estimations.
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Elastic Impedance and Lama's Parameters for Reservoir Lithology and Fluid Discrimination
Authors M. Mirzakhanian, A. Javaherian and M.R. TorabiIn oil industry results of AVO inversion can be used in extracting Lamas parameters and computing elastic impedance for identification of elastic parameters, and discrimination of lithologies and fluid content of reservoir. Cross plot techniques that compare two or more different attributes can be applicable for this object. In this study, we discuss results of AVO inversion curried out in a sandstone reservoir of an oil field in Persian Gulf. We have used 3D prestack seismic data, and log data including shear wave logs of a well in oil part of the reservoir to calibrate with real data. The AVO behavior of the top of reservoir belongs to class IV of AVO anomalies. Extracting Lamas parameters and elastic impedance from seismic data and also cross-plot of different parameters have been useful for discrimination of different lithologies and fluid content.
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Equilibrium Multi Component Model of Hydrocarbon Distribution in Oil and Gas Reservior
Authors A.V. Stepanov, S.N. Repetov and N.A. CheremisinConcentration distribution initialized on existing known data from some wells. After this distribution adapting on reservoir with usage equilibrium model and diffusion process
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Three–dimensional Outcrop Model of the Hammam Faraun Fault Block–Suez Rift–Egypt
By A. KotenevThe research involves integration of geological maps and cross-sections with satellite and topographic data of the Hammam Faraun Fault Block in order to build an adequate digital outcrop model. This new modelling approach is used to simulate the geometry and architecture of the complex system of faults in the study area, which has a half-graben structure with three major normal bounding faults: Thal, Hammam Faraun and Baba-Markha. The fault block is dissected by smaller scale normal faults and antithetic faults dividing the study area into several fault associated segments and zones. The pre-rift and syn-rift strata have been studied in relation to the fault growth, linkage of fault segments, displacement localisation and evolution. Structural model of the fault block has been built in Petrel based on the faults interpretation and correlation according to the pre-existing geological maps and cross-sections. The results from this research project can be used as an exceptional analogue for understanding the complex interplay between syn-rift structural evolution and sedimentary response. One of the major applications of such studies could be successful hydrocarbon development strategy which is based on a full and accurate understanding of the producing reservoir.
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Estimation Filtration Properties Stratum with Multibarrelled Well on the Basis of Mathematical Simulation
In thesis report set out results pressure distribution in stratum with multibarrelled well. Mathematical model makes it possible to estimate filtration properties stratum when recovery cycle pressure
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Geological Model of Yuri Korchagin Hydrocarbon Field in the Northern Caspian Sea Water Area
Authors V.E. Smirnov, S.V. Popovich, S.V. Deliya and N.V. BuleevaThe main objective is validation and construction of the geological model of Yuri Korchagin field reservoirs prepared with account of the results of section parameters forecast based on 3D seismic survey. Significant spatial nonuniformity of lithologic and physical properties as well as reservoir properties of Yuri Korchagin field reservoir on the basis of petrophysical section properties using RockMod technology of geostatic inversion based on stochastic algorithms was delineated
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Enhancement of Oil Layers Recovery by the Impulse-wave Impact
Authors I. I. Khayrullin and V.S. ZamakhaevToday in Russia idles about 20 percent of oil wells. The cause is natural process and factors, attend oil production. With the lapse of time, in the issue of oil selection and disturbance of the system oil-rock, the last consolidates under the influence of overlying layers and reduces permeability. This, in turn leads to decrease of oil well productivity and pumping well receptance. For temporal increase of oil stratum permeability one can apply different methods of impact. For example: stratum ruptures by fluid (HFF) and powder gases of high pressure, acid treatments, thermic -gas-chemical impact, plasma and others. Given fact that the main cracks in the reservoir makes great heterogeneity, complicating the process of extracting oil, as well as the limited time the positive effect of the ruptures, there is a need to look for other approaches to addressing this critical issue. Our work gives a detailed description of one of these solutions - a method of impulse-wave impact (IWI).
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Physical Simulation of Water Alternation Gas Technology at the Heavy Oil Carbonate Reservoir Conditions
Authors R.N. Diyashev, G.N. Piyakov, I.M. Iksanov, R.F. Gainetdinov, R.L. Rahimov, A.K. Makatrov and A.G. TelinLaboratory simulation results of water alternative gas (WAG) processes under the heavy oil carbonate (viscosity equals to 316 cP) and terrigenous (viscosity equals to 439 cP) reservoir conditions are reported. Dependences of reservoir fluid viscosity, density, gas-oil ratio and reservoir volume factor on pumped gas-to-liquid ratio and the dynamics of major oil displacement characteristics (including displacement efficiency, residual oil saturation, displacement pressure gradient, gas and water breakthrough rates etc.) were received. Researches were conducted close to the geological and physical reservoir characteristics, using linear physical models of oilfields composed from native core samples and recombined oil samples; produced water and recombined samples of associated gas were taken as displacement agents. Summary - After the dissolving of pumped gas in reservoir oil viscosity of reservoir fluid reduces more than four times, oil density reduces as well, volume factor and gas-oil ratio increases; - Displacement efficiencies for Bashkir and Bobrikov deposits while water alternative gas were estimated as 65.4% and 73.3% respectively, 33% and 21.1% up as compared to traditional water injection; WAG has additional environmental and associated gas utilization benefits.
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