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Geomodel 2015 - 17th science and applied research conference on oil and gas geological exploration and development
- Conference date: September 07-10, 2015
- Location: Gelendzhik, Russia
- Published: 07 September 2015
101 - 120 of 189 results
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Correlation of Anomalies of the Mid-Frequency Microseisms With Gas Field
Authors E.A. Hogoev and T.I. ChichininaSummaryDeveloped technology of background fields of microseisms of standard seismic prospecting data, allowing to follow the change of their spectral composition along the seismic profile. Results of detection of anomalies microseisms in range up to 40 Hz of one from the perspective areas of Eastern Siberia are given. It is determined, that the borehole, which gave the industrial inflow of gas, is located in the zone of the increased level of the microseismic medium frequencies anomaly
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Application of Anisotropic Joint Total Variation to Inversion of Seismic and Magnetotelluric Data
Authors D.M. Molodtsov, V.N. Troyan, N.Y. Bobrov and D.A. PopovSummaryJoint total variation functional, its anisotropic generalization, and its application to joint inversion of seismic and EM data is discussed. Algorithm of 2-D joint inversion of seismic first-arrival traveltimes and MT impedances is presented. In numerical experiment with synthetic data it is demonstrated, that the discussed algorithm improves both seismic and EM models in comparison with single-domain inversions.
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Quick Assessment of 3D Distribution of Geophysical Parameters to Predict Porosity and Permeability Properties of Rostashi-Konnovkoye Field
More LessSummaryThe main purpose of the work is to explore the possibilities of rapid modeling of geophysical parameters and their distribution, net-reservoir identification and finding zones with best reservoir properties to drill new wells.
In this paper, the geological model is built according to the following scheme: continuous fields of gamma ray index (gamma ray and neutron logs) and a field of wave interval transit time are modeled, and then based on the accepted petrophysical model, the fields are converted into volumes of lithological differences, porosity, and permeability.
The porosity parameters volume was built using the lithofacies distribution and the probability distribution. Net-reservoir and non-reservoir were separated based on the cut-off value - Poro = 4.5% determined by the core data. Tight clay and carbonate rocks and clayey varieties belong to non-reservoir type. The main reservoirs for fluids are limestones and dolomites. The average porosity value of the reservoirs was 8.0%.
According to the analysis of porosity distribution, the porous-cavern reservoir type is most widely spread in the northern part of the field and facially refers to limestones and dolomitic limestones. Fracture porosity is most developed in the southern part of the field near the regional tectonic fault and is most likely of a tectonic origin
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Analysis of Experience of Actual Competencies Formation in Russian Petroleum Sector
Authors K.M. Fedorov and L.V. Prohoda-ShumskySummaryDevelopment of hard-to-recover and offshore resources is the modern challenge of petroleum industry not only in Russia but in the whole world. Perspectives of their exploitation are defined by volume scale, applied technologies of effective production, invest climate and of course personal able to solve new innovation problems.
New competencies formation is a laborious and time-consuming problem that needs significant efforts and financial charges. The history of foreign competencies involvement in Russia for the solution of the problem of personal training for breakthrough directions in petroleum industry is considered. The gained experience in training and engineering cluster based on Academy of Oil and Gas Engineering for additional professional education is analyzed. This cluster includes necessary infrastructure for quality and actual training. Academy offers different types of training activity in the fields of geology, reservoir evaluation and engineering. Almost all Russian production operators are the customers of Academy service. The project is proceeding on the basis of private investment that gives it appropriate flexibility.
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Perform a Pilot Studying Result for Testing of Enhanced Diversity Stack
Authors D.A. Litvichenko, A.S. Sorokin and A.B. KorotkovSummaryThe paper reviews the results of testing Enhanced Diversity Stack. Industrial noise and random impulse noise significantly reduce the non-explosive seismic data quality. This interference cannot be completely removed by accumulation of data in the registration procedure or suppression. Enhanced Diversity Stack is used before seismic processing. This procedure was tested in a pilot studying, in the lake region in winter when ice-cracked forms. Detailed analysis of the testing showed both positive and negative effects from the use of the Enhanced Diversity Stack noise editor. As a result, it is concluded that the Enhanced Diversity Stack should be used in areas with high intensity impulse noise. It is necessary to select the correct parameters of the Enhanced Diversity Stack for each territory.
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Application of Seismic Attributes Analysis Results for Uncertainty Estimation of Facies Boundaries
Authors K.A. Bogdanova, D.A. Reshetnikov and B.V. BelozerovSummaryIn order to succeed in Field development we should understand the reservoir facies distribution, accounting uncertainties related to facies determination. In practice different seismic attributes are used to obtain facies maps, but in this particular case seismic data are characterized by poor quality and attributes are extremely noisy. Integrated core and well logs analysis has showed that facies observed on given area can be distinguished by net to gross ratio. Therefore, prediction NTG maps derived from seismic data were investigated to determine lateral facies boundaries. Taking into consideration that prediction maps are based on regression relationship with well log interpretation data, they have revealed more “geological” and less noisy results. Estimating errors of prediction based on seismic data allowed to calculate pessimistic and optimistic NTG prediction maps, and subsequently to determine pessimistic and optimistic variants of facies boundaries. Then accounting matching of all variants of facies boundaries (basic, pessimistic and optimistic), risk map was constructed and there low risk values were set to the zones, where boundaries of particular facies were overlapped on three variants of facies maps.
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Manifestation of Displacement Line OWC in the Development Field in the Model Seismic Data
Authors N.E. Gurentsov and T.I. TitarenkoSummaryThis work is devoted to studying the impact of the effects of oilfield development on the seismic data. We study the limits of applicability of seismic exploration techniques for monitoring the reservoir state and determining the location and shift of fluid contacts. A traditional collector, representing the anticline structure with a hydrocarbon deposit in its arch, was modeled. Various properties (velocity and density) were investigated for each layer. The first part of the study included modeling of fully oil saturated zone; the geometrical boundaries of this zone determine the position of OWC, which manifests itself in the seismic wave field due to the contrast in elastic properties of contacting fluids. Based on the solution of the acoustic wave equation (P-wave) we’ve acquired CSP seismograms, with the Ricker pulse (center frequency of 60 Hz).
During data processing multiples and external noise were eliminated to obtain a stack with preservation of the true amplitude ratio. Charts of amplitude distribution along the target horizon show the possibility of allocating fluid-saturated zone by the change of the dynamic characteristics of the reflected waves. The migrated CDP stacks were input to the inversion procedure. We studied the effects of oilfield development on the results of different inversion algorithms. Correlation of elastic parameters with geomechanical properties of the medium and forecast of the stress state were performed
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Lithofacies Zonality Research in Terrigenous Deposits with Using Oriented Core Samples
Authors L.A. Krasnoschekova, V.P. Merkulov, D.A. Cherdantseva and I.V. RyashentsevSummaryThe paper deals with using oriented core samples for studying oil reservoirs formation and facies. Structural characteristics of the rocks were studied by the creation of panoramic pictures of the core samples, after that it became possible to study in detail the conditions for the sedimentary rocks formation including azimuth, orientation and lamination incidence angles, dispersal and relationship of lamination parts and their quantitative ratio, etc. In this paper the authors for the first time creates a 3D visualization model of core samples in a graphics editor AdobePhotoShopCS 5 based on panoramic pictures of core samples. Oriented core samples application in the study of oil field rocks allows taking into account characteristics of deposit internal structure and doing the actual reservoir models.
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Selection and Synthesis of Petrophysical Knowledge on the Basis of Building a Semiotic Model of Professional Work
By B.N. EnikeevSummaryThe paper proposes a semiotic model, which explains the structure of most petrophysical publications. That allows drawing the list of typical signs of petrophysical knowledge profanation (irrelevant variables, incorrect significance tests, inadequate regressions etc.) The paper suggests following types of errors : “slob error” (using just built-in models in software); “leader error” (blindly following local authority and neglect specifics of the object); “empiricism error” (using local approximations obtained on a limited sample); “self-deception error” (relying upon formal relationships that have nothing to do with data); “eclectic error” (compounding contradictory information from different models); “model errors” (using incorrect settings for petrophysical models). The author explores how these errors appear, examines their causes, as well as ways to identify and reduce the harm.
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Evaluation of Equilibrium Water Content in Hydrate Saturated Porous Media
Authors V.A. Istomin, E.M. Chuvilin and B.A. BukhanovSummaryThe new technique for estimation of equilibrium water content (nonclathrated water) in hydrate saturated porous media depending on temperature and hydrate-forming gas pressure is discussed. Thermodynamic calculations are based on experimentally determined of pore water potential and water activity by the device WP 4 of Decagon. Two types of pore media are used in experiments: artificial model glass beads, simples without holes (Glass beads), with specify pore-capillary sizes (samples CPG) and multimineral natural clay. The nonclathrated water content in experiments is in a good correlation with structure of the pore space and the temperature shift of hydrate conditions. The calculated values of nonclathrated water are in a good agreement with experimental date that were determined by the contact method.
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Bazhenov Formation Kerogen Porosity
SummaryResults of the bazhenov formation rocks kerogen porosity study are provided in this work. System of pores is found in the kerogen of the rocks that are under catagenetic transformation corresponding to the end of the oil age. Pores were found both in kerogen of carbonate-siliceous and siliceous-radiolarian lithotype rocks and in clay-siliceous rocks of the “matrix”. Using a high-resolution electron microscopy the structure of kerogen void space was studied. Pore size is up to 2 μm, pores are well connected with each other znd have a round, oval or teardrop shape. Void space in the kerogen is prone to pyritization, that negatively impact on the pore volume and their connection. Kerogen porosity depends on the catagenesis stage of rocks, and areas with high kerogen porosity consider to be collectors.
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The use of computer analysis of digital images for the study of core material
By I. KhasanovSummaryThe method is based on the study of digital images of rocks represented by core material or samples using computer software. The method begins with the preparation of core material. Kern has to be pre-sawed and laid on the table for taking photos. Photographs a core made in daylight and ultraviolet light. The result is a digital core images in which each pixel is a set of three colors in the format of RGB. Digital images are recorded in the computer. Work is carried out with the help of the developed software package «CollSkanDigital». The package allows semi-automatic process the digital images and the core material at the outlet to obtain graphical and geological information. The technology has no direct analogues. The method is characterized by high reliability and precision, detailed research. Objects of research are tenths of a millimeter, and the probability of error is negligible because all the graphic and computing works are carried out by technical means with the help of software. Insignificant as the time spent on research. So the study of 100 m. Core in this way, time is on average 3–4 hours, with detailed studies of 1 cm.
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The Bazhenov Formation Research by Physico-Chemical Methods
SummaryThe Bazhenov formation rocks research by standard petrophysical methods gives distorted or incorrect result, so it requires some innovative approaches. This work presents the cation exchange capacity (CAC), oxidation-reduction (ORP) and diffusion-adsorption (DAP) potentials determination. As well as wettability by adsorption method. The main methodogical feautures of experiments with Bazhenov rocks were identified. It was found high values of ORP and hydrophobicity coefficient in couple with low values of CAC in oil-saturated intervals. The DAP value depends on clay content and carbonate inclusions presence
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Geochemistry of Organic Matter Formation Rocks of Khadum Western Caucasus - Source Non-Traditional Accumulations
Authors N.S. Yandarbiyev, E.V. Kozlova, R. Mustaev and K.Y. OdintsovaSummaryGiven the emerging interest in recent years to the study of “slate” sources of hydrocarbons in the world, was conducted geochemical study of sediments Khadum suite Ciscaucasia as a possible reserve replenishment of hydrocarbons in the south of Russia
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Thermal Conductivity as Indicator of Total Organic Carbon for Bazhen Svite Rocks
Authors E.Y. Popov, G.A. Kalmykov, Y.A. Popov, M.Y. Spasennykh, N.N. Bogdanovich and A.M. PleshakovSummaryThe thermal properties (thermal conductivity, volumetric heat capacity, anisotropy coefficient, heterogeneity factor) of 129 core plugs from a well crossed the bazhen svite were studied with the optical scanning technique. Relationship established between the thermal properties and total organic carbon demonstrates a close correlation between the thermal conductivity and total organic carbon. It was established that total organic carbon influence on the thermal conductivity dominates, when a porosity influence on the thermal conductivity, that is essential for other terrigenous and carbonate rocks, is suppressed. Thermal anisotropy coefficient correlates well with the thermal conductivity and total organic carbon also. Thermal heterogeneity factor increases with a decrease in total organic content that characterizes texture and structure of the bazhen svite rocks. The results demonstrate that thermal conductivity data inferred easily with high precision with application of the non-destructive non-contact optical scanning technique application provides quick and representative estimation of the total organic carbon from numerous measurements on full size cores. Such approach can be implemented within a thermal core logging when the measurements of thermal conductivity, volumetric heat capacity, thermal anisotropy coefficient, and thermal heterogeneity factor are performed from continuous thermal profiling on all full size cores recovered from a well.
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Using Principles of Mixing and Inclusion Doesn’t Always Guarantee Fun
By B.N. EnikeevSummaryPrinciples of inclusion and mixing have been developed in the first half of the 20-th century. A number of researchers used them to evaluate physical properties of rocks. The author, together with M.M.Ellansky, published a series of articles and two books on this methodology and its applications. Growing popularity of the method in the recent publications make it crucial to draw attention to the limitations of these principles. Both principles are theoretically limited by the similarity of the field obtained by averaging at the next stage of inclusion or mixing. But this condition is not operational. In the end, we have to rely on the result - an empirical test. The report illustrates on two examples that the discrete version of the principles is inefficient to analyze the relationship of permeability and capillary pressure curves.
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Improving Quality of Rock Anisotropy Study by Combining Sonic Logging and Thermal Conductivity Measurements on Cores
Authors Y.A. Popov, I.V. Mikhaltseva, E.M. Chekhonin, E.Y. Popov, R.A. Romushkevich, G.A. Kalmykov and I.D. LatypovSummaryAcoustic anisotropy in sedimentary rock has a significant impact on seismic processing. Recent sonic processing techniques allow estimation of TIV anisotropy by obtaining shear velocity from Stoneley data. This however is often challenging and will depend on the quality of the acoustic signal, borehole and mud conditions as well as the direction of the borehole with respect to the anisotropic axes of symmetry. Combining sonic logging and sonic measurements on cores leads to a necessity to sample several plugs in different directions, rock heterogeneity interference, full size core destruction that makes the approach time-consuming and not reliable often. We combined the SonicScanner logging data with fast, non-contact non-destructive measurements of principal thermal conductivity tensor components on cores that provided a comprehensive analysis of variations in thermal and acoustic anisotropy along a well for the first time. Thermal conductivity was measured on 369 full size cores along a 60-meters interval. The study showed that both thermal and acoustic anisotropy are related to rock texture and well correlated. Moreover, analysis of thermal anisotropy was used for anisotropy characterization in intervals where well conditions did not allow estimating rock anisotropy from the sonic logging data
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The Influence of Material Composition on the Filtration Properties of the Reservoir
Authors D.B. Chizhov, S.A. Gubin, I.A. Kozhevnikov, I.A. Shilov and V.V. MalikovSummaryIn the article special attention is given to the siderite found in Bobrikov sediments by Unvinskoye field. Siderite is of interest in connection with the problem encountered in the operation of injection wells. In some of the wells observed a decrease in permeability during injection of surface waters. This effect is also observed when performing filtration tests on the core samples in the laboratory
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Application of Effective Medium Theory to Reconstruction of Elasticity Tensor of Bentheimer Sandstone
Authors T.R. Yalaev, E.M. Chekhonin, E.Y. Popov, V.V. Abashkin and R.A. RomushkevichSummaryKey macroscopic characteristics of hydrocarbon-bearing formations (necessary information for development of the oil and gas deposits) are determined mainly by microscopic structural features of the reservoir pore space. Combination of effective medium theory with high-quality laboratory experiments on thermal and acoustic properties of rocks provides important information for petrophysics and prospecting geophysics. An example is demonstrated with well-known rock - Bentheimer sandstone – which is widely used for many purposes. 20 cores were accurately studied at the normal conditions at air- and water-saturated states. Parameters of rock microstructure were estimated, the forward EMT-based model of rock properties has been created using two different methods, and the elasticity tensor of Bentheimer sandstone was reconstructed. The constructed model was successfully validated by comparison the calculated thermal conductivity, compressional and shears wave velocities with corresponding laboratory measurements at different saturation state. Demonstrated that preliminary validation of EMT-based model on extended experimental dataset is critically important, that can have an impact on successful solution of different problems of prospecting geophysics. Consistent model promotes deeper understanding the link between different rock properties, results can be used for improvement different engineering models of effective properties.
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Hydraulic Fracture Propagation in a Layered Elasto-Plastic Medium
Authors Y.P. Stefanov and A.V. MyasnikovSummarySome results of hydraulic fracture (HF) modeling in brittle-ductile formations are presented. Main peculiarities of HF propagation in such formations are captured by the developed physical and computational model. The HF design for specific engineering jobs requires data of reservoir elastic and strength properties, and on initial stress distribution, which all are not always available. Thus, the major goal of the present modeling is to link the observed features of hydraulic fracture propagation with uncertainties of the mentioned above properties
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