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Geomodel 2019
- Conference date: September 9-13, 2019
- Location: Gelendzhik, Russia
- Published: 09 September 2019
121 - 140 of 140 results
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Experience of Application and Interpretation of Eelectrical Logging Data in Cased Wells of Western Siberia
More LessSummaryNanoelectric logging is one of the important components of a complex of studies in cased wells, carried out in order to monitor the current state of productive objects in the developed areas. This hardware-software complex allows to measure the specific electrical resistance of rocks through a metal casing. Moreover, it is the main source of information about the electrical properties of the incision in cases where the recording of resistance methods in the open hole could not be performed before the casing of the well. Studies show high accuracy of determining the electrical resistivity of rocks, good convergence of measurement results in a wide range of application conditions, which allows using the algorithms described in the work in order to obtain a forecast of the current saturation with a high degree of reliability.
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Inverse Rock Physics Modelling as a Tool to Quantitative Seismic Reservoir Characterization of Carbonate Rocks
Authors F.A. Milosnov, A.V. Shubin and D.A. DankoSummaryWe performed reservoir characterization based on inverse rock physics modeling for one oilfield in the Timano-Pechera region. The idea of the proposed method is to calibrate the rock physics model and then apply it in reverse direction for reservoir property estimation. In this case, the input data are elastic attributes, the output will be reservoir properties. We applied Bayesian approach for rock physics inversion. As a result, we transformed seismic elastic attributes into reservoir parameters: matrix porosity, vuggy porosity and volume of calcite.
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Methodological Features of Determining the Total Permeability of Shale Deposits
Authors A. Borisov, V.A. Nachev, F. Denisenko and A. CheremisinSummaryThe paper deals with the methodological and metrological features of determining the permeability of shale reservoirs. The authors performed a series of experiments on the measurement of permeability as a standard Permeameter PIC-PP (analogue of the AP-608), as well as on shale permeameters Darcy-Press and SMP-200. Measurements were carried out on samples of Domanik and Bazhenov deposits. The samples were investigated in non-extracted and extracted condition. Measurements on solid samples were performed by Pulse-Decay and Pseudo Steady-State and Build-Up methods. Measurements crushed samples were carried out according to the method GRI-95/0496. The paper identifies a number of important factors affecting the results of measuring the permeability of shale rock samples. These factors are the method of sealing side surface, the format of the sample, pressure gradient, crimping, method of preparation, method of measurement, methods of quality control. The authors give recommendations on the implementation of permeability measurements in shale deposits. According to the results of R&D, the authors came to the conclusion that the measurements of the permeability of shale rocks are significantly different from the measurements of the permeability of classical reservoirs. These measurements require special approaches to the measurement procedure and sample preparation, as well as special equipment.
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How to Map the Jurassic Rivers, Lakes and Swamps? (Creation of the Sscheme of Depositional Settings for J2 Reservoir Using Five Seismic Surveys of Various-Years)
Authors O.Y. Kirzelyova, T.N. Kiryanova, M.D. Fedorova, R.Y. Kopenkin, D.V. Klyazhnikov and A.A. KaluginSummaryThe presentation uses a real example to discuss the methodology for mapping different facies objects associated with the Tyumen J2 reservoir, namely: lacustrine-boggy zones; paleochannels; fans, etc. Five 3D survey datasets acquired and processed in various years were used in this work. The authors also demonstrate the possibility of the identified paleochannel objects ranking into sand and shaled-out beds according to a number of certain features.
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Lithological and Petrophysical Characteristics of the Lower Permian Carbonate Reservoirs of the Northern and Southern Urals Based on Core and Well Log Data
Authors D.V. Klyazhnikov and V.V. PankovSummaryLower Permian carbonate deposits are widespread on the territory of the Russian plate, including on its Eastern outskirts, within the Urals. They are characterized by extensive lithofacial heterogeneity, significant variability of porosity and permeability, the predominant development of low-pore reservoirs. The paper presents a comparative analysis of the lower Permian carbonate deposits confined to the Northern and southern parts of the pre-Ural regional deflection. A similar lithological structure of sediments, due to the common spatial and temporal features of the territory, allows to perform such a comparison. For the analysis, the results of the core study and GIS data on the Kochmes field located in the Northern part of the Urals, and a number of areas in the South – Nagumanovskaya, Peschanaya, Vershinovskaya etc. On the basis of sequence stratigraphy method involving sedimentological and lithological-petrographic study of the core, the main facies of the situation were identified. Evaluation of the lithological volume model and permeable identification were carried out using lithodensity log, spectral gamma-ray log, cross-dipole array sonic log etc. The most high-capacity rocks are confined to facies of organogenic buildings in the southern part of the pre-Ural regional deflection, with a predominance of porous-cavernous and porous reservoirs.
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From Foothills to the Sea. The Conceptual Depositional Model of Early-Middle Jurassic period for the Northern Edge of the Shaimsky Petroleum District
Authors M.D. Fedorova, O.Y. Kirzelyova, T.N. Kiryanova, R.Y. Kopenkin, D.V. Klyazhnikov and A.A. KaluginSummaryThick sedimentary series potentially promising for HC deposits formation and preservation were accumulated in the Early-Middle Jurassic time in the lands of Shaimsky and neighbouring Krasnoleninsky petroleum districts; they are Sherkalinsky and Tyumen formations. Accumulation of Sherkalinsky and Tyumen formations (J10 and J9-J2 reservoirs) occurred against the background of the territory downwarping and natural evolution of depositional settings from paleohighlands and slopes, accumulative valleys, to shallow marine environments. Using the frequency decomposition method and RGB-blending, analysis of well log diagrams, results of core lithofacies analysis, the sequential conceptual model of deposition of Early-Middle Jurassic productive series in the area of large multiplay field was created. The authors delineated the following different facies zones: slopes of highlands with proluvial fans; fluvial, lacustrine-boggy plains; subaerial and submarine delta parts; shallow-marine shore. Boundaries of separate sand bodies having different genesis were determined, they are: channels, delta lobes and front, delta distributary channels, longshore bars.
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Joint 1d Inversion of MT and TEM Data
Authors A.V. Chernyshev, M.V. Abramov and A.V. KuklinSummaryIn MT data interpretation there is a problem of data distortion owing to nonuniform conductivity of the upper part of the section. Additional TEM measurements for parameterization of the upper part are often conducted. After that the parameters of the deep objects are effectively estimated using MT data. We consider and discuss the capabilities of the joint 1D inversion of the MT and TEM data with the model example and real model of regional profile.
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Shallow Electromagnetic Soundings sTEM for WaterBearing Reservoirs Mapping under the Permafrost Zone within Yakutia Region
SummaryThe paper shows results of the transient electromagnetic method in the near zone (sTEM), conducted in Yakutia in 2019 From the research the geoelectric section to a depth of 500 m was examined. High resolution of geoelectric properties of the section enabled building a map of water-bearing reservoirs of the Lower Cambrian distribution.
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On Petrophysical Interrelations of Diffusion-Adsorption (Membrane) Potential with Porosity and Transport Properties
By B.N. EnikeevSummaryFor several decades, Russia has been successfully trying to eliminate its own polarization method from quantitative interpretation of logging. There are a lot of objective reasons for this (cunning drilling muds, inaccessibility of reliable corrections in the section with differentiated resistance, low cost method, lack of petrophysical substantiation).The varied variants of the theoretical substantiation of the method that pretend to seriousness usually associate indications with the ratio of clay content (specific surface) of rocks to their porosity or with the ratio of the conductivities of the clay and sand components. The author saw his task in collecting the most plausible relationships for assessing the relationship with other physical properties and in assessing the significance of a parameter when building petrophysical relationships. F=(1 + (Ada/Ada,sh)*(rsh/Rw-1))/(PHI^m). The simplest equation of communication (sample length is 470 lines, and coefficient of determinism = 0.85) has the form: LgKpr = 2.16 + 0.132 * PHI - 3.18 * Lg Ада (3) Thus, the parameter LgАда actually differentiates the connection between the PHI and the Kperm according to different hydraulic units. At the same time, further increasing the number and type of regressors does not lead to a significant increase in the coefficient of determination.
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Estimation of the Organic Matter Maturity Level in the Bazhenov Formation Deposits
Authors E.V. Kozlova, T.D. Bulatov, E.A. Leushina, M.Y. Spasennykh, I.S. Gutman, G.N. Potemkin and A.Y. BaturinSummaryBazhenov Formation is a well known unconventional reservoir within the West Siberian Petroleum Basin. This deposits contain a huge amount of kerogen – up to 30 wt. %. One of the main characteristics of source rocks for oil generation is kerogen thermal maturity. Maturity level shows the residual generation potential and the possible amount of hydrocarbons in natural reservoirs and amount of hydrocarbons that can be generated by source rock using thermal enhanced oil recovery methods. This work proposed complex investigations including pyrolysis for core samples before and after bitumen extraction. According to the scheme of maturation and distribution of pyrolysable hydrocarbon groups in the unconventional source rocks we can use complex of Rock-Eval parameters such as generative organic carbon (GOC) to remaining organic carbon ratio (GOC/TOC*100%), hydrogen index in samples after extraction (HIex= S2ex/TOC*100%), productivity index (PI=S1/(S1+S2) and Tmax to estimate maturity level of organic matter. Using geochemical and pyrolysis parameters we can evaluate maturity of the Bazhenov Formation organic matter which is important for reserves estimation and distinguishing areas of natural and technically stimulated reservoirs.
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Geochemical Characteristics of Sapropelite in the Bazhenov Formation Deposits
Authors T.D. Bulatov, E.V. Kozlova, M.Y. Spasennykh and E.A. LeushinaSummaryDue to increasing interest to oil shales, study of the Bazhenov Formation deposits of the West Siberian Petroleum Basin is progressing extensively. Despite the seeming homogeneity, in closer observation the composition of the Bazhenov Formation rocks vary significantly. The main objectives were to characteristic lithology and geochemistry of the Bazhenov Formation rocks containing sapropelite interlayers. The material for the present study were core samples from several wells located in the central part of the West Siberian Petroleum Basin. During this research, samples were selected, petrographic thin sections were made and described, and pyrolysis and kinetic studies were carried out by the HAWK pyrolysis from Wildcat Technology. The current study reveals, sapropelite interlayers are characterized by high content of alginitic organic matter. The origin is yet unknown but two possible ways of forming of such deposits were proposed. The Bazhenov Formation sapropelite consist of 30÷35 % alginate with quartz and chalcedonic inclusions. Pyrolysis characteristics of sapropelite interlayers differ from host deposits by anomalously high hydrogen index HI (up to 1015 mg HC/g TOC). According to bulk-kinetics study, the whole organic matter of sapropelites transforms to HCs at single Ea around 53 kcal/mol.
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A Few Approaches to Heterogeneity Interference Attenuation in Transient Electromagnetic Method
Authors I.K. Seminskiy, I.V. Buddo, V.S. Emelyanov, V.V. Gomulskiy, M.G. Persova, A.A. Belaya and G.M.SummaryThe report proposes a modern way to account for the distortion of the TEM curves using 3D modeling using the example of oil and gas inlets in Western Siberia.
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Risk Analysis in the Modeling for Greenfield with Geological Uncertainties
Authors A.F. Galimova, М.А. Stepanov and О.А. GeidekoSummaryThe example of the Beluga oil field on the southern shelf of Vietnam shows the possibility of complex geological modeling with limited data. The main problems and uncertainties in the field are the low confirmability of the structural plan according to the seismic data, low study of the full-sized core, fragmentary testing of the pay zone, uncertainty of the well logging interpretation, ambiguous level of the oil-water contact. The experience of neighboring fields demonstrated that high expectations for reserves and productivity in conditions of insufficient knowledge led to the failure to fulfill the production plan. Thus, attention is focused on sources of geological uncertainty. To this end, a conceptual model of the geological structure was created, an approach to modeling under conditions of significant uncertainties was developed and a probabilistic estimate of the reserves was made. The performed seismic facies modeling gave us an understanding of the details of the sedimentation condition. As a result, a detailed, volumetric representation of the geological structure of the field was created. That was served as the basis for constructing probabilistic geological and hydrodynamic models and their analysis, the results of which allowed planning the economically efficient development of the feature.
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Integrated Adaptive Accounting Technology Element Accounting Application for Near-Surface Section and Kinematic Interpretation in the Zone-Sea -Transition Zone-Offshore in the North of Western Siberia
Authors E.N. Bardachenko, Y.N. Dolgikh and D.V. GulyaevSummaryNear-surface effect example influence methodology of the upper part cross-section on seismic data using the Western Siberia.
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Amplifier-Frequency Balancing of Seismic Data by Principal Component Analysis
Authors S.P. Shvetsov, O.A. Littau and V.V. IvanovSummaryCommonly standard methodic of seismic processing could not correctly compensate transparent amplifier-frequency anomaly which take place in regions with highly variable surface condition and complicate structure of near-surface. Further will discuss application of amplifier corrections, calculated by principal component analysis.
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The Use of Modern Processing Technologies to Improve the Seismic Image and Obtain New Geological Information on the Example of Seismic Data of the East Siberian Sea
SummaryIn the waters of the Russian Arctic, the East Siberian Sea region is characterized by the lowest degree of geological knowledge. The results of seismic data processing, obtained in recent years, make it possible to clarify the geological structure of the region, assess the prospects for oil and gas potential, and outline plans for further work. The use of modern software and in-depth processing graph allows not only to improve the quality of the seismic image, but also to extract fundamentally new information about the deep structure of the environment, increasing the accuracy of further geological exploration.
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The Q Tomography and Q-PSDM Application to Taking into Account Absorption for Seismic Resolution Enhancement and Generation AVO Compliant Data
Authors I.V. Tsvetukhin, N.K. Myasoyedov, S.N. Iliine, K.U. Kudryavtsev and A.S. KornevSummaryThis paper is dedicated to the Q-Tomo and Q-PSDM technology. Q-Tomo allows to obtain a detailed model of the absorption parameter Q using the tomography algorithm. The Q-PSDM imaging takes into account the obtained Q model along the raypath during depth migration. Due to this, a more accurate recovery of the amplitude-frequency characteristics of the signal is achieved, the resolution of the seismic recording is improved, the reliability of the AVO analysis is increased.
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Some Aspects of Design and Accounting for a Priori Information when using Cluster Regression to Solve Geological and Geophysical Problems
By B.N. EnikeevSummaryThe gradual complication of geological and geophysical tasks supplied by practice leads to an increase in the specialization of practitioners in the application of geological and geophysical software. At the same time, specialized geophysical software is not always developed by specialists who have an adequate understanding of the complexity and specifics of the tasks being solved, and geophysics practitioners are often not sure about the limitations inherent in the algorithms and the ability to set the algorithm in practice. The situation is aggravated on the one hand by the cooperation of professionals who are insufficiently versed in geophysics (often both programmers and non-specialized managers) and the complexity of the tools used (which do not always understand and explain the degree of likelihood or randomness of the results obtained by the programs). Such a direction of development follows the general trend of simplification and McDonaldization of many technologies, but in the case of geology and geophysics the level of uniqueness and specificity of most geological and geophysical objects limits this trend. In the advanced version of McDonaldization, it is accompanied by an increase in quality control and testing. However, in geophysics, sets of free tests and polygons for solving specific problems are not widely used. As a result, there is a tendency when the software and its developers, instead of the role of assistant specialist, begin to claim the role of a host, whose slave professionals are. One of the answers to the above trends is the formalization and use of a priori geological and geophysical information. The report discusses the features of the use of such information on the example of algorithms such as cluster regression.
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Comparative Analysis of the Survey Azimuth Influence at the Results of Processing and Inversion
Authors M.S. Pervunin, R.R. Murzin and D.A. LitvichenkoSummaryDolginskoe oil field was discovered at 1999 with exploration well YD1 at the Pechora (Barents) Sea, which drilling showed oil content. Then seismic 3D survey data was acquired at 2006. Based on results of seismic data interpretation several wells were designed. At 2014 well SD3 was drilled and it showed gas content. New information caused revision of geological model of carbonate and terrigenous reservoirs. Probably some faults could be invisible on this data. And for better results new survey was designed at 2017. Its azimuth was perpendicular to the azimuth of survey 2006. And both these surveys provided to possibility of the analysis of azimuth influence on the results of processing and inversion.
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Deep Water Deposits Of The North-West Caucasus. Excursion Guidebook
More LessSummaryThe guide contains materials on selected Cretaceous and Paleocene deep water sections in the environs of the Gelendzhik City. It describes main peculiarities of the deep water outcrops and their brief interpretation. It also contains some additional information on the local geology and general features of the deep water sedimentation.
The guide is intended for geologists, paleontologists, stratigraphers, students as well as amateur geologists.
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