The distribution of cumulative production and current oil reserves of all categories, differentiated by administrative subjects located within the West Siberian oil and gas province, shows significant heterogeneity in the distribution of these indicators across stratigraphic horizons. For each horizon, an integration of the reserves-to-production ratio criterion (A category) and water cut is carried out. It is shown that the main share of both cumulative production and current recoverable reserves that ensure this production falls on the Neocomian complex, which has critically high water cut and low flow rates.
{"title":"Analysis of the reserves-to-production ratio for various stratigraphic complexes of Western Siberia","authors":"A. Sokolov, A. V. Shubina","doi":"10.18599/grs.2023.1.5","DOIUrl":"https://doi.org/10.18599/grs.2023.1.5","url":null,"abstract":"The distribution of cumulative production and current oil reserves of all categories, differentiated by administrative subjects located within the West Siberian oil and gas province, shows significant heterogeneity in the distribution of these indicators across stratigraphic horizons. For each horizon, an integration of the reserves-to-production ratio criterion (A category) and water cut is carried out. It is shown that the main share of both cumulative production and current recoverable reserves that ensure this production falls on the Neocomian complex, which has critically high water cut and low flow rates.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44349495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of Western Siberia is one of the most large-scale scientific, industrial and socio-economic projects of the country in the 20th century. The state approach, scientific substantiation, production of the necessary equipment, organization of transport and exploration work were linked into a single integrated state project. As part of the USSR Ministry of Geology, the Main Directorate for Oil and Gas Exploration was created, and on January 15, 1948, an order was signed to organize the first oil exploration expedition in Tyumen. In January 1950, the Scientific and Technical Council of the USSR Ministry of Geology adopted a master plan for the study and development of the West Siberian Plate, including the placement of 26 reference wells, regional seismic profiles and prospecting in the area of reference wells on its territory. As a result, the gas fields of the Berezovskiy region and the Shaimskoe, Megionskoe and Ust’-Balykskoe oil fields were discovered. Efficient organization of work and the state approach made it possible to discover large oil reserves in the Shirotny Ob region and unique natural gas reserves in the north of Western Siberia in a short time. In December 1963, a special resolution of the Council of Ministers of the USSR on preparation for the trial operation of deposits, on the creation of infrastructure for the development of geology and oil production, research and industrial institutes was adopted. Achievements of geologists have provided the necessary basis for the creation of the largest fuel and energy complex. It was associated with the social and economic development of the region and the country
{"title":"The development of Western Siberia is a state scale project of the second half of the 20th century","authors":"A. Brekhuntsov, V. N. Bityukov","doi":"10.18599/grs.2023.1.1","DOIUrl":"https://doi.org/10.18599/grs.2023.1.1","url":null,"abstract":"The development of Western Siberia is one of the most large-scale scientific, industrial and socio-economic projects of the country in the 20th century. The state approach, scientific substantiation, production of the necessary equipment, organization of transport and exploration work were linked into a single integrated state project. As part of the USSR Ministry of Geology, the Main Directorate for Oil and Gas Exploration was created, and on January 15, 1948, an order was signed to organize the first oil exploration expedition in Tyumen. In January 1950, the Scientific and Technical Council of the USSR Ministry of Geology adopted a master plan for the study and development of the West Siberian Plate, including the placement of 26 reference wells, regional seismic profiles and prospecting in the area of reference wells on its territory. As a result, the gas fields of the Berezovskiy region and the Shaimskoe, Megionskoe and Ust’-Balykskoe oil fields were discovered. Efficient organization of work and the state approach made it possible to discover large oil reserves in the Shirotny Ob region and unique natural gas reserves in the north of Western Siberia in a short time. In December 1963, a special resolution of the Council of Ministers of the USSR on preparation for the trial operation of deposits, on the creation of infrastructure for the development of geology and oil production, research and industrial institutes was adopted. Achievements of geologists have provided the necessary basis for the creation of the largest fuel and energy complex. It was associated with the social and economic development of the region and the country","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47722454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An analysis of historical statistical data on the hydrocarbons growth and drilling during prospecting and exploration of oil and gas fields in the Shirotny Ob region made it possible to identify important patterns in the dynamics of work efficiency criteria. The obtained calculations of the specific annual and average long-term efficiency of prospecting and exploration works can be used to plan drilling meterage, estimate the time of drilling operations and calculate their cost. The feasibility of carrying out prospecting and exploration drilling to convert regional resource expectations into proven reserves of commercial categories is assessed.
{"title":"Retrospective analysis of prospecting and exploration efficiency at the Glavtyumengeologia in 1960–1990 in the Shirotny Ob region as the basis for planning prospecting and exploration drilling","authors":"Alexander V. Sokolov","doi":"10.18599/grs.2023.1.4","DOIUrl":"https://doi.org/10.18599/grs.2023.1.4","url":null,"abstract":"An analysis of historical statistical data on the hydrocarbons growth and drilling during prospecting and exploration of oil and gas fields in the Shirotny Ob region made it possible to identify important patterns in the dynamics of work efficiency criteria. The obtained calculations of the specific annual and average long-term efficiency of prospecting and exploration works can be used to plan drilling meterage, estimate the time of drilling operations and calculate their cost. The feasibility of carrying out prospecting and exploration drilling to convert regional resource expectations into proven reserves of commercial categories is assessed.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47185331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Borodkin, M. V. Komgort, Ivan I. Nesterov (Jr.)
The history of creation is given, the complex of studies carried out by the Tyumen branch of Siberian Research Institute of Geology, Geophysics and Mineral Resources (SNIIGGiMS) in 1960–1964 and by West Siberian Research and Geological Prospecting Oil Institute (ZapSibNIGNI) in 1964–1996 is analyzed. The role of the Institute in the substantiation of oil and gas potential and developing the resource base of the West Siberian oil and gas province is shown. The scientific forecasts and developments of the Institute’s employees, which influenced the increase in the efficiency of geological exploration are presented. In preparing the article, previously unpublished documents from the archive of the Directorate of ZapSibNIGNI were used.
{"title":"The leading role of West Siberian Research and Geological Oil Exploration Institute in the development of the oil and gas potential of the West Siberian oil and gas province and the development of the country’s mineral resource base","authors":"V. Borodkin, M. V. Komgort, Ivan I. Nesterov (Jr.)","doi":"10.18599/grs.2023.1.3","DOIUrl":"https://doi.org/10.18599/grs.2023.1.3","url":null,"abstract":"The history of creation is given, the complex of studies carried out by the Tyumen branch of Siberian Research Institute of Geology, Geophysics and Mineral Resources (SNIIGGiMS) in 1960–1964 and by West Siberian Research and Geological Prospecting Oil Institute (ZapSibNIGNI) in 1964–1996 is analyzed. The role of the Institute in the substantiation of oil and gas potential and developing the resource base of the West Siberian oil and gas province is shown. The scientific forecasts and developments of the Institute’s employees, which influenced the increase in the efficiency of geological exploration are presented. In preparing the article, previously unpublished documents from the archive of the Directorate of ZapSibNIGNI were used.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48971613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Oksenoyd, V. Isaev, S. G. Kuzmenkov, Maksim V. Novikov, T. N. Pecherin
This research aims to analyze problems related to resources, reserves and development of Bazhenov-Abalak oil and gas play and to find geological and technological solutions for bringing reserves into development commercially. This should stabilize oil production in Okrug on the level 210–215 million of tons. Geological, field and statistical data from V.I. Shpilman Research and Analytical Centre for the Rational Use of the Subsoil and Department of Subsurface Management & Natural Resources of Khanty-Mansi Autonomous Okrug – Yugra were retrospectively analyzed during this research. Oil production from Bazhenov-Abalak play using conventional technologies is still sub economic. Running experimental areas and test ranges for industrial approval of development efficiency enhancement technologies for Bazhenov-Abalak play are created on producing fields. Unfortunately, accumulated experience ends up inside oil companies. Undoubtedly, single initiatives of oilmen will not solve a problem of development of huge resources in Bazhenov formation.
{"title":"Problems of oil and gas potential realization in Bazhenov-Abalak play in Khanty-Mansi Autonomous Okrug – Yugra","authors":"E. Oksenoyd, V. Isaev, S. G. Kuzmenkov, Maksim V. Novikov, T. N. Pecherin","doi":"10.18599/grs.2023.1.6","DOIUrl":"https://doi.org/10.18599/grs.2023.1.6","url":null,"abstract":"This research aims to analyze problems related to resources, reserves and development of Bazhenov-Abalak oil and gas play and to find geological and technological solutions for bringing reserves into development commercially. This should stabilize oil production in Okrug on the level 210–215 million of tons. Geological, field and statistical data from V.I. Shpilman Research and Analytical Centre for the Rational Use of the Subsoil and Department of Subsurface Management & Natural Resources of Khanty-Mansi Autonomous Okrug – Yugra were retrospectively analyzed during this research.\u0000Oil production from Bazhenov-Abalak play using conventional technologies is still sub economic. Running experimental areas and test ranges for industrial approval of development efficiency enhancement technologies for Bazhenov-Abalak play are created on producing fields. Unfortunately, accumulated experience ends up inside oil companies. Undoubtedly, single initiatives of oilmen will not solve a problem of development of huge resources in Bazhenov formation.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42719567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper is aimed at the prediction of oil and gas occurrence of the Upper Permian, Lower Triassic and Lower Jurassic deposits in the Vilyui hemisineclise. The basin modeling research implies the Upper Paleozoic and Mesozoic petroleum system model of the Vilyui hemisineclise. The initial generation time at the bottom of the Permian source rock is 270 Ma. The most intense generation of hydrocarbons is found to be in the late Permian and early Triassic. The generation power of the Permian source rock is 800 trillion m3. The hydrocarbon losses is up to 90% in consequence of unfavorable seal properties of the Lower Triassic and Lower Jurassic clay formations. All the potential hydrocarbon traps of the Vilyui hemisyneclise are considered to be formed during the Cretaceous stage of development. There is therefore an appropriate environment for the hydrocarbon accumulation to be in progress. The interpretation of geological and geophysical data identifies the areal extent prediction of sand reservoirs and overlying clay interlayers of high quality in the Upper Permian and Lower Triassic seals. The goal of a comprehensive approach to the sedimentary basin research is to divide the territory into oil and gas zones of various prospects in relation to the factors controlling hydrocarbon deposits.
{"title":"Prediction of oil and gas occurrence in the Vilyui hemisineclise according to interpretation of geological and geophysical data and basin modeling (Republic of Sakha (Yakutia))","authors":"M. Fedorovich, A. Kosmacheva","doi":"10.18599/grs.2023.1.9","DOIUrl":"https://doi.org/10.18599/grs.2023.1.9","url":null,"abstract":"The paper is aimed at the prediction of oil and gas occurrence of the Upper Permian, Lower Triassic and Lower Jurassic deposits in the Vilyui hemisineclise. The basin modeling research implies the Upper Paleozoic and Mesozoic petroleum system model of the Vilyui hemisineclise. The initial generation time at the bottom of the Permian source rock is 270 Ma. The most intense generation of hydrocarbons is found to be in the late Permian and early Triassic. The generation power of the Permian source rock is 800 trillion m3. The hydrocarbon losses is up to 90% in consequence of unfavorable seal properties of the Lower Triassic and Lower Jurassic clay formations. All the potential hydrocarbon traps of the Vilyui hemisyneclise are considered to be formed during the Cretaceous stage of development. There is therefore an appropriate environment for the hydrocarbon accumulation to be in progress. The interpretation of geological and geophysical data identifies the areal extent prediction of sand reservoirs and overlying clay interlayers of high quality in the Upper Permian and Lower Triassic seals. The goal of a comprehensive approach to the sedimentary basin research is to divide the territory into oil and gas zones of various prospects in relation to the factors controlling hydrocarbon deposits.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49575005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Sudakov, Rinat I. Safuanov, Aleksey N. Kozlov, Timur M. Porivaev, A. Zaikin, Rustam A. Zinykov, A. Lutfullin, Ildar Z. Farhutdinov, Ilgiz Z. Tylyakov
At the late stage of field development, residual oil reserves undergo a significant change from mobile to sedentary and stationary. These reserves are mainly located in technogenically and production altered, watered layers and areas of deposits. Localization and development of such sources of hydrocarbons is an effective method of increasing the final oil recovery factor in mature fields, due to the presence of a ready-made developed infrastructure for production, transportation and refining, as well as the availability of highly qualified personnel. This article considers an approach that allows, based on neural network algorithms, the estimation the volumes and localization of residual oil reserves in multi-layer deposits in combination with the analysis of geochemical studies of reservoir fluids. The use of machine learning algorithms allows a targeted approach to the development of residual reserves by automated selection of wellwork. This approach significantly reduces the manual labor of specialists for data processing and decision-making time.
{"title":"Localization and development of residual oil reserves using geochemical studies based on neural network algorithms","authors":"V. Sudakov, Rinat I. Safuanov, Aleksey N. Kozlov, Timur M. Porivaev, A. Zaikin, Rustam A. Zinykov, A. Lutfullin, Ildar Z. Farhutdinov, Ilgiz Z. Tylyakov","doi":"10.18599/grs.2022.4.4","DOIUrl":"https://doi.org/10.18599/grs.2022.4.4","url":null,"abstract":"At the late stage of field development, residual oil reserves undergo a significant change from mobile to sedentary and stationary. These reserves are mainly located in technogenically and production altered, watered layers and areas of deposits.\u0000\u0000Localization and development of such sources of hydrocarbons is an effective method of increasing the final oil recovery factor in mature fields, due to the presence of a ready-made developed infrastructure for production, transportation and refining, as well as the availability of highly qualified personnel.\u0000\u0000This article considers an approach that allows, based on neural network algorithms, the estimation the volumes and localization of residual oil reserves in multi-layer deposits in combination with the analysis of geochemical studies of reservoir fluids. The use of machine learning algorithms allows a targeted approach to the development of residual reserves by automated selection of wellwork. This approach significantly reduces the manual labor of specialists for data processing and decision-making time.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47692524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alfiya R. Mukhutdinova, A. Bolotov, O. V. Anikin, M. Varfolomeev
An important tool in determining residual oil saturation today is the single-well tracer test, as the preferred method for assessing the potential for using enhanced oil recovery methods (EOR) and developing pilot projects. The success of the test performed directly depends on the optimal choice of the tracer composition, which will contribute to the qualitative determination of the parameters required in the calculation of the residual oil saturation of the formation. To assess the boundary conditions for the applicability of the tracer in the field, the kinetic and thermodynamic properties of tracers are considered under various reservoir conditions of the field. Based on the results of this work, an algorithm for assessing the applicability of the tracer for reservoirs in a wide range of salinity and temperatures is presented.
{"title":"Algorithm for estimating boundary conditions of a distributed tracer for application in a single-well tracer test","authors":"Alfiya R. Mukhutdinova, A. Bolotov, O. V. Anikin, M. Varfolomeev","doi":"10.18599/grs.2022.4.6","DOIUrl":"https://doi.org/10.18599/grs.2022.4.6","url":null,"abstract":"An important tool in determining residual oil saturation today is the single-well tracer test, as the preferred method for assessing the potential for using enhanced oil recovery methods (EOR) and developing pilot projects. The success of the test performed directly depends on the optimal choice of the tracer composition, which will contribute to the qualitative determination of the parameters required in the calculation of the residual oil saturation of the formation. To assess the boundary conditions for the applicability of the tracer in the field, the kinetic and thermodynamic properties of tracers are considered under various reservoir conditions of the field. Based on the results of this work, an algorithm for assessing the applicability of the tracer for reservoirs in a wide range of salinity and temperatures is presented.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49233741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Silantiev, M. Validov, D.N. Miftakhutdinova, V. Morozov, B. Ganiev, A. Lutfullin, K. Shumatbaev, Rishat M. Khabipov, Nouria G. Nurgalieva, Z. Tolokonnikova, E. Korolev, V. Sudakov, Anastasiya V. Smirnova, Kseniya A. Golod, A. Leontiev, Ruslan R. Shamsiev, Mikhail V. Noykin, Viktor E. Kosarev, Darya A. Nikonorova, Radik F. Akhmetov
The Pashyian Regional stage (horizon) is the main productive unit of the middle Devonian clastic succession of the South Tatar arch. This article presents, for the first time, maps of the lower and upper parts of the Pashyian, including data on sand-shale ratio, number of sand layers (reservoirs) and thickness, based on the analysis of logging data from 25,000 wells. The maps were created by spatial interpolation of Natural Neighbor and ArcGIS Pro software. The model of sedimentation of the Pashyian Regional stage reflects the interpretation of the plotted maps as well as the synthesis of the results of detailed core investigations (lithological, sedimentological, ichnotextural, petrophysical, etc.) and analysis of archive and published materials. The main points of the proposed model are as follows. The Pashyian sediments were formed in a marine basin, in an environment comparable to that of the middle shelf of modern seas – in an offshore zone dominated by current activity. The basin floor was a relatively flat plateau, on which sandy, silty and clay sediments were simultaneously accumulated. Sediments of all types accumulated during sea transgression. Sea regression caused erosion and destruction of the already formed sediments. Positive landforms of seabed relief, composed predominantly of sandy well-sorted material, comprised autochthonous underwater sand bars, formed by constant currents parallel to the bathymetric contour of the seabed. Underwater sand bars formed extensive systems nearly throughout the entire territory of the modern South Tatar arch. At the same time, allochthonous, poorly sorted, less mature sediments were formed in underwater troughs produced by transversal currents (directed from the shore towards the sea). The proposed model explains the consistent thickness of the Pashyian Regional stage, the mosaic distribution of sand bodies over the area, and the lens-like shape of the sand and siltstone reservoirs. The model can be extrapolated to other stratigraphic intervals of the Devonian clastic succession with similar sedimentological features.
{"title":"Sedimentation model of the middle Devonian clastic succession of the South Tatar Arch, Pashyian Regional stage, Volga-Ural Oil and Gas Province, Russia","authors":"V. Silantiev, M. Validov, D.N. Miftakhutdinova, V. Morozov, B. Ganiev, A. Lutfullin, K. Shumatbaev, Rishat M. Khabipov, Nouria G. Nurgalieva, Z. Tolokonnikova, E. Korolev, V. Sudakov, Anastasiya V. Smirnova, Kseniya A. Golod, A. Leontiev, Ruslan R. Shamsiev, Mikhail V. Noykin, Viktor E. Kosarev, Darya A. Nikonorova, Radik F. Akhmetov","doi":"10.18599/grs.2022.4.2","DOIUrl":"https://doi.org/10.18599/grs.2022.4.2","url":null,"abstract":"The Pashyian Regional stage (horizon) is the main productive unit of the middle Devonian clastic succession of the South Tatar arch. This article presents, for the first time, maps of the lower and upper parts of the Pashyian, including data on sand-shale ratio, number of sand layers (reservoirs) and thickness, based on the analysis of logging data from 25,000 wells. The maps were created by spatial interpolation of Natural Neighbor and ArcGIS Pro software.\u0000\u0000The model of sedimentation of the Pashyian Regional stage reflects the interpretation of the plotted maps as well as the synthesis of the results of detailed core investigations (lithological, sedimentological, ichnotextural, petrophysical, etc.) and analysis of archive and published materials.\u0000\u0000The main points of the proposed model are as follows. The Pashyian sediments were formed in a marine basin, in an environment comparable to that of the middle shelf of modern seas – in an offshore zone dominated by current activity. The basin floor was a relatively flat plateau, on which sandy, silty and clay sediments were simultaneously accumulated. Sediments of all types accumulated during sea transgression. Sea regression caused erosion and destruction of the already formed sediments.\u0000\u0000Positive landforms of seabed relief, composed predominantly of sandy well-sorted material, comprised autochthonous underwater sand bars, formed by constant currents parallel to the bathymetric contour of the seabed. Underwater sand bars formed extensive systems nearly throughout the entire territory of the modern South Tatar arch. At the same time, allochthonous, poorly sorted, less mature sediments were formed in underwater troughs produced by transversal currents (directed from the shore towards the sea).\u0000\u0000The proposed model explains the consistent thickness of the Pashyian Regional stage, the mosaic distribution of sand bodies over the area, and the lens-like shape of the sand and siltstone reservoirs. The model can be extrapolated to other stratigraphic intervals of the Devonian clastic succession with similar sedimentological features.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45387375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Tchistiakov, Kseniia O. Zudina, Aigul R. Davletshina, E. Shvalyuk, V. Baranov
The proposed method of predicting spatial distribution of leaching zones in carbonate reservoirs includes integrated interpretation of well logging data, including electrical microimages (Formation MicroImager – FMI), together with analysis of lithofacies within depositional cycles. Based on the comparison of FMI data with results of lithological and petrophysical studies of the core, an atlas of diagenetic porosity images for the studied formation was developed. Choquette and Pray international classification was used for pore typing. Applying the developed atlas to FMI logs, karstification zones were identified and classified in reference wells. In wells, where only standard well loggings was performed, karstification zones were identified using a developed decision tree. Sedimentological and sequence stratigraphic analysis made it possible to identify sedimentation cycles and to correlate the main lithofacies within the target reservoir. It was established that microbial and shallow facies form the most productive part of the reservoir. These facies with initially high primary porosity were subjected to the most intensive karstification along sequence stratigraphic boundaries due to subaerial exposure. The established relationships between leaching zones, lithofacies, and sequence-stratigraphic boundaries made it possible to carry out inter-well correlation of karstified intervals. The correlation will allow construction of leaching zones maps, that will be further applied for geological modeling.
{"title":"Prognosis of leaching zones distribution in carbonate reservoirs","authors":"A. Tchistiakov, Kseniia O. Zudina, Aigul R. Davletshina, E. Shvalyuk, V. Baranov","doi":"10.18599/grs.2022.4.10","DOIUrl":"https://doi.org/10.18599/grs.2022.4.10","url":null,"abstract":"The proposed method of predicting spatial distribution of leaching zones in carbonate reservoirs includes integrated interpretation of well logging data, including electrical microimages (Formation MicroImager – FMI), together with analysis of lithofacies within depositional cycles. Based on the comparison of FMI data with results of lithological and petrophysical studies of the core, an atlas of diagenetic porosity images for the studied formation was developed. Choquette and Pray international classification was used for pore typing. Applying the developed atlas to FMI logs, karstification zones were identified and classified in reference wells. In wells, where only standard well loggings was performed, karstification zones were identified using a developed decision tree. Sedimentological and sequence stratigraphic analysis made it possible to identify sedimentation cycles and to correlate the main lithofacies within the target reservoir. It was established that microbial and shallow facies form the most productive part of the reservoir. These facies with initially high primary porosity were subjected to the most intensive karstification along sequence stratigraphic boundaries due to subaerial exposure. The established relationships between leaching zones, lithofacies, and sequence-stratigraphic boundaries made it possible to carry out inter-well correlation of karstified intervals. The correlation will allow construction of leaching zones maps, that will be further applied for geological modeling.","PeriodicalId":43752,"journal":{"name":"Georesursy","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48012862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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