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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
41 - 60 of 210 results
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Optimization of Exploration on Central Uvat Territory
Authors E.A. Marchenko and O.S. MalyginaLast 15 years the territory of Central Uvat in the south of West Siberian region is an area of exploration. 16 oilfields with 100 BBE were discovered for this period. Characterized sediments are related to Tyumen formation of Middle Jurassic. Major prospects are associated to Upper part of Tyumen Fm (units U2, U3, U4). Sedimentation processes of these sediments are of estuary-deltaic type. Key limiting feature for reserves volume is quality of reservoirs, its vertical and lateral variability in lithology, porosity, permeability and difficulties in prediction of distribution. It caused of searching of non-typical decisions for exploration process. This article demonstrates one of them. The base of it is complexation of all information about the fields, more exactly seismic, sedimentological and mineralogical core analysis, well logs. This method has become the base of successful exploration. Investigation of the territory allows to define following geological properties: abrupt facies variability which caused lenticular structure of reservoirs, lithology-tectono-structural type of traps, absence of coincidence of zone of high porosity with zones of high permeability. Moreover, investigation makes possible to explain changes in oil water contact between the blocks of fields, estimate prospects of the territory and to define the orientation of future exploration
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Geological Structure Refinement of the Veni Group of Traps Based on Integrated Interpretation of Seismic and Well Data
Authors G.G. Voykov, O.S. Zhukova, A.I. Arapova, A.M. Gritsenko, E.S. Kaptelova, D.E. Kashcheev JSC and D.G. KirnosThis work describes refinement of geological structure of the group of traps on the shelf of the Sakhalin island. The integrated interpretation of seismic and well logging data technology presented includes: detail analysis of tectonic faults system, rock physics analysis, up-to-date AVA seismic inversion software implementation, technology of reservoir properties, reservoirs presence and pore saturation prediction. Subsequent well logging data is well correlated with the predicted values.
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New Approaches to Interpretation of Geophysical and Well Data in Forecasting Hydrocarbon Accumulations in Oil–Gas Basins
Authors A.I. Kushmar, V.I. Mitasov and V.A. Kondrat’evCommercial hydrocarbon accumulations in carbonate deposits are not usually controlled by a structural factor. Forming reservoir rocks here is often associated with the secondary processes (solution, leaching, compaction) that is responsible for the reasonably complicated structure of interstitial space of carbonate rocks (particularly in saline environment) and the insignificant change of capacity properties in transferring from non-reservoir to reservoir (sometimes percent fractions). For recognizing such fine effects, it is necessary to pass gradually from petrophysical parameters determined on well logging data, core, testing to the attributes of a seismic signal (amplitudes, energy and others). Such a procedure is carried out by the way of successive constructing the petrophysical, geoacoustic and seismic-geological models. In the case of absence of density measuring in wells, necessary for geoacoustic modeling, it is calculated on the parameters of a petrophysical model. Practical examples for concrete fields of Eastern Siberia are given
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Forecast of Section Reservoir Properties Based on Seismic and Logging Data with the use of Genetic Inversion in Petrel Software Complex
Authors P.F. Popova and N.V. BuleevaTechnique and results of geological section forecasting using genetic inversion, performed in Petrel software complex (Shlumberger) is proposed. This technology helps to perform seismic inversion with minimum prior information. The first stage consists of nonlinear multitrace operator creation using genetic algorithms. This process employs seismic and logging data. Reservoir modeling with the use of seismic inversion results as a trend constitutes the second stage. Radioactivity logging is used for terrigenous section forecasting. It allows for the most complete section petrophysical properties differentiation with shale volume and NTG ratio assessment. Density log data was used in prediction of carbonate deposits section decompaction zones. Studies on this technology, performed in LUKOIL-VolgogradNIPImorneft Ltd. onshore within Volgograd Povolzhie and in the aquatic area of the North Caspian are represented. Here submitted are the results of genetic inversion integral accuracy test results for the field, mostly explored with drilling
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Chimney Detection as a Tool in Hydrocarbon Exploration and Prospect Evaluation–A Case Study from Persian Gulf
By S. sepahvandChimney detection is a technique which can be used as an exploration tool that provides important information for prospect evaluation and charged or non-charged prospects identification.The method applies multi trace seismic attributes, neural network modeling and the interpreter's insight.The approach shows how a fault can separate a reservoir in two parts with different hydrocarbon bearing behaviors.The results indicate in effect of fault sealing characteristic, The whole of reservoir horizons are not gas bearing and fault has divided it in two parts and acted as a seal and barrier between them
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3D Fault Detection Based on Statistical Approach
Authors A.G. Averbukh, E.R. Akhmetova, N.L. Ivanova and S.Y. GrafThis paper describes 3D fault detection methodology. As the destruction zone indicator we suggest some new attributes based on eigen-value analysis of seismic data. Multidimensional classifications are applied to separate faulted zone volumes. In particular, statistical cluster analysis allows to enter, formalize and consider in process similarity level of fault indicators. Thereafter we use advanced image processing algorithm to highlight faulted zones skeletons (surfaces). This method was approved on real seismic data
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Joint Automated Technology of Well to Well Log Correlation
The problem considered is necessity and possibility of automatic well-to-well correlation, for oil fields having a big number of wells. The conclusion is made that successful strategy is to find a compromise between formal automatic and informal interactive tools. Two different automatic procedures are analyzed, first one implemented in AutoCorr program and the second in DV-Geo modeling system. The analysis shows that the compromise existing in one system is complimentary to the compromise existing in the another. Thanks to this feature, joint correlation processing in AutoCorr and in DV-Geo becomes very efficient. New automated technology is realized by each system updating in part of share data processing tools. Examples of the technology application are shown as well.
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Modular Neural Networks Reservoir Properties Prediction
Authors D.V. Loginov JSC and A.S. Lavrik JSC JSCIn this article we represent new technology which can improve performance of the reservoir properties prediction based on the seismic and well data, while using neural networks as prediction mechanism. This technology contains three main steps . 1-st step - Statistical or neural model based attributes selection and transformation. 2-nd step - Formal (algorithmic) or informal (geological) clustering of the source area. 3-rd step - Special (modular) learning of the set of neural networks and construction of the cooperative network to predict reservoir properties. Especially this work represent the use of modular, cooperative neural networks to improve generalization accuracy of quantitative interwell reservoir properties approximation using seismic attributes, well data and formal and informal data clustering techniques. There is also the real sample to show modular neural networks improved performance.
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Effect of Porous Fluid Properties on Stoneley Wave Parameters
Authors V. Dorovsky, V. Dubinsky, M. Podberezhnyy and Y. NefedkinThe following primary effects are described and analyzed in our paper based on the performed thorough theoretical study, mathematical modeling and actual lab measurements: - Dependence on the Stoneley Wave Attenuation Length on the rock permeability. - Corrections to calculated permeability values introduced due to salinity of the saturation fluid. - Effects of specific chemical content of the porous fluid on derived permeability value.
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About Permeability Evaluation by Acoustic-magnetic Logging
Authors B.D. Plyushchenkov and A.A. NikitinNew way for permeability evaluation of fluid-filled rock surrounding an uncased borehole based on electrokinetic effect is suggested. This approach is based on Pride’s model describing the coupled propagation of acoustic and electromagnetic disturbances in porous elastic media saturated by an electrolyte. Arising acoustic and electromagnetic waves excited by an acoustic emitter. On the basis of numerical modeling it is established, that the ratio of complex-valued amplitude of Stoneley wave of azimuth component of magnetic field to complex-valued amplitude of Stoneley wave of pressure is very sensitive to variation of formation permeability and mudcake stiffness. These amplitudes are determined from expansions of registered wave trains of pressure and azimuthal component of magnetic field in terms of plain waves. For open and sealed pores on borehole wall the approximate analytical expressions for this ratio are presented. For these cases by fit of appropriate parameters of these expressions it’s possible to evaluate rock permeability.
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Horizontal Well Electric Logging Data Interpretation on the Basis of Direct and Inverse Problem Solving
By A.P. PotapovEstimation of drilling pipes impact on electric logging data provided by “AMK Gorizont” tool was made on the basis of mathematic modeling. An algorithm of specific electric resistance determination is described on the basis of mathematic measurement modeling for the specified model (sonde, environment) and solving of an inverse problem. Advantages of the algorithm for the interpretation of actual logging data are shown.
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Casing Technical State Control of Oil and Gas Wells by Integrated Russian–China Equipment
Authors A.A. Miller, A.V. Miller, S.V. Stepanov, V.G. Sudnichnikov, Q.I. Fu, J. Luo and K. Lin’Due to common efforts of Russian and Chinese specialists an integrated apparatus DDS73F-EMD was designed, which contains modules of multilevel borehole geometry tool and electromagnetic defectoscopy. The tool allows making a detail survey of casing technical state in one round trip, which is important for effective planning of well-workover operations. The detailed image of column inner surface is reconstructed according to the borehole geometry tool data in scanning and 3D image, which is linked to the apsidal plane. Herewith corrosion intervals, holes and pits on casing inner surface as well as buckling zones are fixed. Due to the defectoscope module data corrosion, fractures of any directions, defects of the second from the well axis casing are identified, wall thickness of the inner and the second column on inner and outer column surface is determined. Joint consideration of the result achieved by two different in basic physics methods essentially improves accuracy and definiteness of the interpretation.
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Assessment of Clustering Methods for Predicting Permeability in a Heterogeneous Carbonate Reservoir
Authors F. Khoshbakht and M. MohammadniaPermeability, the ability of rocks to flow hydrocarbons is directly determinedfrom core. Due to high cost associated with coring, many techniques suggested to predict permeability from easy to obtain and frequent properties of reservoir such as porosity. This study launched to put clustering methods (MRGC, SOM, DC and AHC) into practice in permeability prediction of a heterogeneous carbonate reservoir in SW Iran. Conventional approaches like empirical models and regression analysis were also examined. Performance of all examined methods compared in order to choose the best approach for predicting permeability in uncored wells of the studied field. For all clustering methods, selecting optimal number of clusters is the most important task. The optimal value for the number of clusters selected by iteration. The optimal number of clusters for MRGC, SOM, DC and AHC is 7, 9, 9 and 8 respectively. Empirical equations and regression analysis could not predict permeability well and R2 of estimation of both approach were around 0.6. Generally performance of clustering techniques was acceptable regarding to Fahliyan formation. These techniques predict permeability between 1 and 1000 mD very well and just overestimate permeability below 1 mD. SOM performed the best between examined techniques (R2=0.7911).
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New Tool and Programming and Methodological Software of Geophysical Propagation in Well
Authors I.N. Eltsov, M.I. Epov, K.N. Kayurov, A.N. Petrov, C.V. Suhorukova, A.Y. Sobolev and A.A. VlasovTraditional task as a identification boundary of beds, definition of lithology and the estimation of oil saturation can be solved by new logging tool SKL. In advantage fresh tasks as estimation of the dielectric conductivity and it dispersion in frequency range of HILS can be solved by this tool also. Identification of invaded zone can be made by only one tool combined two different tools – LL & HILS. The example of real LL and HILS logs is applied. Effective interpretive system EMF-Pro is designed to processing SKL logs
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Frequency Dispersion of Electrical Permittivity from Lateral Logging and High–frequency Induction Logging Data
Authors C.V. Suhorukova and M.I. EpovMismatching in apparent resistivity processing from lateral logging and high-frequency induction logging data on clayey intervals is able to explain for a frequency dispersion of dielectric permittivity. The value of relative dielectric constant from 875 kHz to 14 MHz frequency range can be estimated by the complex interpretation data of LL and HILS. Results obtained by this method matching with data, measuring on clay pattern obtained by outside research group
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Cement Bond Gamma Logging Data Algorithmic Interpreting
Authors D.A. Kozhevnikov and I.S. DeshenenkovProblems of cement bond gamma logging interpretative metrological control are considered. Methods for the detection of various cementing defects cases are proposed. Appropriate models are presented. Automated algorithm for quantitative cement bond gamma logging data processing and interpreting as well as its results are introduced.
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Development of Formation Evaluation Methods for Structurally Complicated Carbonate Reservoirs
Authors A.V. Chashkov and V.M. KiselevAuthors of the work considered the ability of lithologic structure determination and total and secondary porosity defining on the basis of one of the several oilfields located in the Eastern Siberia. This oilfield is characterized by chemical and biogenic reservoir rocks with porosity of cavity and fractured structure. There are some theoretical backgrounds for porosity structure determination by comparing data of sonic log with formation evaluation methods using for total porosity interpretation. However fracture and cavity influence on porosity determination can be hided by various petrophysical parameters such as shaliness, salinization, anhydritization etc. In the given work the technique by a quantitative estimation of porosity of fractures, vugs and intergrain porosity for carbonate reservoirs with difficult lithological structure on complex sonic logging- neutron gamma-ray logging is offered. For the correct decision of the assigned task it is necessary to make "adjustment" of the stated algorithm for those wells where full formation evaluation methods was executed.It is showed that using given method obtained results reliably represent geological features of considered field.
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System–defined Geological Modeling of a Deposit Treated as an Integral
By S.I. BilibinThere are pointed out the problems in geological modeling of oil and gas deposits, arising during synthesis of particular stratum digital models into a single integrated model. It is shown, that only a system approach to the initial information, including concept development for stratum formation history and deposit accumulation, brings a possibility to build a whole deposit model consistent with geological principles. It is also shown, that the differentiated approach to various modeling objects allows one to build a 3D geologic model adequate to the initial data, which provide increase in reserve estimation reliability. There are given examples, when the integrated object structure revision has allowed the creation of non-contradictive geologic model.
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The Complex Method of Geological Modeling of Fractured Carbonate Reservoir by the Example of Hasyreyskoye field
Authors Y.V. Merkushkina, K.S. Savichev and D.N. LevinIn this work present the method of geological modeling of fractured carbonate reservoirs by the example of Hasyreyskoye field in Timan-Pechora basin. This type of reservoirs has two components of the pore space – matrix and fractures. Two methods were be used for creating this geological model of the reservoir. Modeling of the matrix part include the sequence stratigraphy method of study the geological section using the core and well data. The sequence stratigraphy method has allowed more precise relationship between porosity and permability by the facies. The modeling of discrete fracture network was be used for creating of fractured part of reservoir. Seismic and well data (FMI) were be used for modeling of fractures. As result both created models were be integrated in the united fluid-flow model for making technological decisions. Represented method may be recommended for modeling of such type of reservoirs with the object of accurate definition of subsurface geology and optimization of exploitation system
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Examples of Multidisciplinary Approach Application for Fractured Reservoirs of West and East Siberia
By O.V. PinousTwo methods of fracture modeling are reviewed using two examples from West and East Siberia. These include CFM (Continuous Fracture Modeling) and DFN (Discrete Fracture modeling). Practical utilities of these techniques have been examined for the Siberian fractured objects.
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