Pub Date : 2024-07-17DOI: 10.3103/s0145875224700194
A. D. Podobrazhnykh, T. A. Eremina, E. I. Marchenko, N. N. Eremin
Abstract
A complex crystal-chemical analysis of 1567 oxygen positions in 216 crystal structures of lead-containing minerals assigned to the classes silicates, phosphates, oxides, oxohalides, and a number of others has been performed. It is shown that the combined application of the bond valence method and analysis of geometric characteristics of Voronoi–Dirichlet polyhedra makes it possible to reliably distinguish between oxygen positions related to cation structure blocks and oxygen positions, for which a description based on an anion-centered approach is more reasonable. Numerical indicators for such separation of oxygen positions are substantiated, which can be used to analyze large arrays of structural data, using the machine learning approaches.
{"title":"Crystal-Chemical Indicators of Specification of Oxocentered Tetrahedra in Divalent Lead Minerals","authors":"A. D. Podobrazhnykh, T. A. Eremina, E. I. Marchenko, N. N. Eremin","doi":"10.3103/s0145875224700194","DOIUrl":"https://doi.org/10.3103/s0145875224700194","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A complex crystal-chemical analysis of 1567 oxygen positions in 216 crystal structures of lead-containing minerals assigned to the classes silicates, phosphates, oxides, oxohalides, and a number of others has been performed. It is shown that the combined application of the bond valence method and analysis of geometric characteristics of Voronoi–Dirichlet polyhedra makes it possible to reliably distinguish between oxygen positions related to cation structure blocks and oxygen positions, for which a description based on an anion-centered approach is more reasonable. Numerical indicators for such separation of oxygen positions are substantiated, which can be used to analyze large arrays of structural data, using the machine learning approaches.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739451","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700212
E. Yu. Baraboshkin, P. A. Fokin
Abstract
A Turonian ammonite, Kamerunoceras sp. ex gr. turoniense (d’Orb.) has been found for the first time in the southwestern Crimea, in the section of the Aksu-Dere ravine, northward of the village of Kudrino (Kacha River basin). This is the first discovery of representatives of this genus in Russia.
{"title":"A Unique Find of the Ammonite Kamerunoceras (Acanthoceratidae, Ammonoidea) from the Turonian (Upper Cretaceous) of the South–Western Crimea","authors":"E. Yu. Baraboshkin, P. A. Fokin","doi":"10.3103/s0145875224700212","DOIUrl":"https://doi.org/10.3103/s0145875224700212","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A Turonian ammonite, <i>Kamerunoceras</i> sp. ex gr. <i>turoniense</i> (d’Orb.) has been found for the first time in the southwestern Crimea, in the section of the Aksu-Dere ravine, northward of the village of Kudrino (Kacha River basin). This is the first discovery of representatives of this genus in Russia.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739727","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700285
D. S. Gusarova, D. A. Yablonskaya, O. A. Lipatnikova, T. N. Lubkova, O. R. Filatova
Abstract
The article focuses on the results of water parameters (COD, pH, electrical conductivity) and the contents of major ions (Ca2+, Mg2+, Na+, K+, ({text{NH}}_{4}^{ + }), ({text{HCO}}_{3}^{ - }), Cl–, ({text{SO}}_{4}^{{2 - }}), ({text{NO}}_{3}^{ - })) and trace elements (Co, Ni, Cu, Zn, Cd, Pb, Sr, Ba, Mn) for 12 springs in the Bogorodsky and Losino-Petrovsky districts of Moscow oblast. The waters are slightly acidic to near-neutral (pH 5.5–7.5) with the mineralization ranging from 0.07 to 0.5 g/L, the total hardness is 0.63–5.7 mg-eq/L, the water composition is variable. Spring waters are divided into four groups: Cl–SO4–HCO3–(Mg)–Ca, (SO4)–HCO3–Cl–Na–Ca; (Cl)–HCO3–Ca, and mixed. Based on the thermodynamic calculation using the Visual-MINTEQ program, it was found that the predominant dissolved species of Ba, Sr, Mn, Zn, Cd, Ni, and Co in the waters of the surveyed springs are free ions. For Cu and Pb, the factors for the formation of migration species are the predominant anions of water, as well as the presence of organic matter in water. The COD values and nitrogen compound in the waters of individual springs indicate that the formation of the spring water composition is resulted from the infiltration of atmospheric precipitation through the modern sediments subject to anthropogenic loading. The values of other sanitary–chemical indicators (mineralization, pH, total hardness, chlorides, sulfates, magnesium, sodium, manganese), the content of regulated trace elements are lower than their maximum permissible concentrations in drinking water.
Abstract The article focuses on the results of water parameters (COD, pH, electrical conductivity) and content of majorions (Ca2+, Mg2+, Na+, K+, ({text{NH}}_{4}^{ + }),({text{HCO}}_{3}^{ - })、Cl-,({{SO}}_{4}^{2 - }}),({{NO}}_{3}^{ - })) 和微量元素（钴、镍、铜、锌、镉、铅、锶、钡、锰）。泉水呈微酸性至接近中性（pH 值为 5.5-7.5），矿化度为 0.07 至 0.5 克/升，总硬度为 0.63-5.7 毫克-当量/升，水的成分多种多样。泉水分为四类：Cl-SO4-HCO3-（Mg）-Ca、（SO4）-HCO3-Cl-Na-Ca、（Cl）-HCO3-Ca 和混合。根据使用 Visual-MINTEQ 程序进行的热力学计算，发现调查泉水中的钡、锶、锰、锌、镉、镍和钴的主要溶解物种是游离离子。至于铜和铅，形成迁移物种的因素是水中的主要阴离子以及水中有机物的存在。个别泉水中的化学需氧量值和氮化合物表明，泉水成分的形成是大气降水通过受人为负荷影响的现代沉积物渗透的结果。其他卫生化学指标值（矿化度、pH 值、总硬度、氯化物、硫酸盐、镁、钠、锰）以及规定的微量元素含量均低于饮用水的最大允许浓度。
{"title":"Geochemical and Sanitary–Chemical Characteristics of Water Springs of Bogorodsky and Losino-Petrovsky Districts of Moscow Oblast","authors":"D. S. Gusarova, D. A. Yablonskaya, O. A. Lipatnikova, T. N. Lubkova, O. R. Filatova","doi":"10.3103/s0145875224700285","DOIUrl":"https://doi.org/10.3103/s0145875224700285","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article focuses on the results of water parameters (COD, pH, electrical conductivity) and the contents of major ions (Ca<sup>2+</sup>, Mg<sup>2+</sup>, Na<sup>+</sup>, K<sup>+</sup>, <span>({text{NH}}_{4}^{ + })</span>, <span>({text{HCO}}_{3}^{ - })</span>, Cl<sup>–</sup>, <span>({text{SO}}_{4}^{{2 - }})</span>, <span>({text{NO}}_{3}^{ - })</span>) and trace elements (Co, Ni, Cu, Zn, Cd, Pb, Sr, Ba, Mn) for 12 springs in the Bogorodsky and Losino-Petrovsky districts of Moscow oblast. The waters are slightly acidic to near-neutral (pH 5.5–7.5) with the mineralization ranging from 0.07 to 0.5 g/L, the total hardness is 0.63–5.7 mg-eq/L, the water composition is variable. Spring waters are divided into four groups: Cl–SO<sub>4</sub>–HCO<sub>3</sub>–(Mg)–Ca, (SO<sub>4</sub>)–HCO<sub>3</sub>–Cl–Na–Ca; (Cl)–HCO<sub>3</sub>–Ca, and mixed. Based on the thermodynamic calculation using the Visual-MINTEQ program, it was found that the predominant dissolved species of Ba, Sr, Mn, Zn, Cd, Ni, and Co in the waters of the surveyed springs are free ions. For Cu and Pb, the factors for the formation of migration species are the predominant anions of water, as well as the presence of organic matter in water. The COD values and nitrogen compound in the waters of individual springs indicate that the formation of the spring water composition is resulted from the infiltration of atmospheric precipitation through the modern sediments subject to anthropogenic loading. The values of other sanitary–chemical indicators (mineralization, pH, total hardness, chlorides, sulfates, magnesium, sodium, manganese), the content of regulated trace elements are lower than their maximum permissible concentrations in drinking water.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739446","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700236
A. L. Jurina
Abstract
The article considers the appearance, composition, types, and distribution of the first Devonian fossil forests on Earth, finds of which are extremely rare. There are five known localities: three in the Middle Devonian (Middle Eifelian locality Lindlar in Germany; two Upper Givetian localities Cairo and Gilboa in the USA), and two in the Upper Devonian (Lower Frasnian locality Munindalen on Svalbard in Norway and the Upper Famennian locality Xinhang in China). The terms fossil forest, forests community, and a type of fossil forest, not mentioned by previous researchers, are proposed, and a detailed plan for their description is recommended (formulations are presented only for remains in the status in situ). The stratigraphic sequence of the first forests in the Eifelian–Late Devonian of the Earth’s history, taking into account recently published data, is presented. Two types of forests have been identified with indication of the dominant genera in each type: the cladoxylopsid type, common in the Middle Devonian, and the lycopodiophyte type, typical of the Upper Devonian. A key role of cladoxylopsid ferns in the creation of original arboreal forests due to advantages in the organization of their conducting system is shown.
{"title":"First Devonian Forests on Earth: Appearance, Composition of Plants, Types of Forest Ecosystems, and Their Distribution","authors":"A. L. Jurina","doi":"10.3103/s0145875224700236","DOIUrl":"https://doi.org/10.3103/s0145875224700236","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article considers the appearance, composition, types, and distribution of the first Devonian fossil forests on Earth, finds of which are extremely rare. There are five known localities: three in the Middle Devonian (Middle Eifelian locality Lindlar in Germany; two Upper Givetian localities Cairo and Gilboa in the USA), and two in the Upper Devonian (Lower Frasnian locality Munindalen on Svalbard in Norway and the Upper Famennian locality Xinhang in China). The terms <i>fossil forest</i>, <i>forests community</i>, and <i>a type of fossil forest</i>, not mentioned by previous researchers, are proposed, and a detailed plan for their description is recommended (formulations are presented only for remains in the status in situ). The stratigraphic sequence of the first forests in the Eifelian–Late Devonian of the Earth’s history, taking into account recently published data, is presented. Two types of forests have been identified with indication of the dominant genera in each type: the cladoxylopsid type, common in the Middle Devonian, and the lycopodiophyte type, typical of the Upper Devonian. A key role of cladoxylopsid ferns in the creation of original arboreal forests due to advantages in the organization of their conducting system is shown.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739723","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700248
N. I. Krupina, A. A. Prisyazhnaya
Abstract
A comprehensive review of monographic paleontological collections from the Earth Science Museum at Moscow State University is performed. The systematic and quantitative composition, territory of collection, and age of host deposits are analyzed. The importance of monographic collections as a fundamental element for the description of new taxa, stratigraphic constructions, and correlation of coeval deposits in remote areas is emphasized. The directions of research work with materials from the collections are shown. Information on the form of receiving the collections for storage from the authors is provided.
{"title":"Monographic Paleontological Collections as an Important Source of Information in Paleontological Research","authors":"N. I. Krupina, A. A. Prisyazhnaya","doi":"10.3103/s0145875224700248","DOIUrl":"https://doi.org/10.3103/s0145875224700248","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A comprehensive review of monographic paleontological collections from the Earth Science Museum at Moscow State University is performed. The systematic and quantitative composition, territory of collection, and age of host deposits are analyzed. The importance of monographic collections as a fundamental element for the description of new taxa, stratigraphic constructions, and correlation of coeval deposits in remote areas is emphasized. The directions of research work with materials from the collections are shown. Information on the form of receiving the collections for storage from the authors is provided.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739726","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700224
S. I. Merenkova, A. Yu. Puzik, I. V. Afonin, A. A. Medvedkov, E. S. Rabtsevich, R. R. Gabdullin, V. V. Pugach
Abstract
The Evenki Formation of the Siberian Platform has been studied on the right bank of the Podkamennaya Tunguska River near the Sulomai settlement (Evenki municipal district of Krasnoyarsk krai). The structures and textures of the composing sediments are described. The main petrogenic oxides have been identified and the normative mineral composition has been determined following this identification. The increase of terrigenous components in the strata indicates periods of enhanced erosion in the provenance area (the Yenisei Ridge). In turn, the increased contribution of feldspars in the middle part of the section shows an intensification of physical weathering in arid conditions. The principal hypotheses of the origin of the Evenki Formation and other recent and ancient tidal flat and sabkha facies are outlined. We suggest that the studied facies of the Evenki Formation accumulated mostly under intertidal and, possibly in part, under lower supratidal conditions, which alternated depending on eustatic fluctuations in the basin. A conceptual model of the genesis of the Evenki Formation on the Siberian Platform has been developed.
{"title":"The Formation Conditions of the Evenki Formation in the Lower Reaches of the Podkamennaya Tunguska River, Siberian Platform","authors":"S. I. Merenkova, A. Yu. Puzik, I. V. Afonin, A. A. Medvedkov, E. S. Rabtsevich, R. R. Gabdullin, V. V. Pugach","doi":"10.3103/s0145875224700224","DOIUrl":"https://doi.org/10.3103/s0145875224700224","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Evenki Formation of the Siberian Platform has been studied on the right bank of the Podkamennaya Tunguska River near the Sulomai settlement (Evenki municipal district of Krasnoyarsk krai). The structures and textures of the composing sediments are described. The main petrogenic oxides have been identified and the normative mineral composition has been determined following this identification. The increase of terrigenous components in the strata indicates periods of enhanced erosion in the provenance area (the Yenisei Ridge). In turn, the increased contribution of feldspars in the middle part of the section shows an intensification of physical weathering in arid conditions. The principal hypotheses of the origin of the Evenki Formation and other recent and ancient tidal flat and sabkha facies are outlined. We suggest that the studied facies of the Evenki Formation accumulated mostly under intertidal and, possibly in part, under lower supratidal conditions, which alternated depending on eustatic fluctuations in the basin. A conceptual model of the genesis of the Evenki Formation on the Siberian Platform has been developed.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739722","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700200
D. S. Zykov, A. V. Poleshchuk, A. O. Agibalov, S. Yu. Kolodyazhny, E. A. Manuilova
Abstract
The forms of salt rises occur under the influence of stresses developing in the Earth’s crust and can therefore be considered sensitive indicators of the interaction of geodynamic systems. The forms of salt rises, reflecting the superposition of these systems, arose in the North German Basin, in the Cis-Uralian Foredeep on the boundary with the Caspian Depression, and in the Pripyat Trough under the influence of various sources of stress and deformation. The mechanisms of such a superposition were both the formation of forms associated with the resulting addition of strain vectors and interference of forms associated with each geodynamic system individually.
{"title":"Forms of Salt Rises as Indicators of Interaction of Geodynamic Systems","authors":"D. S. Zykov, A. V. Poleshchuk, A. O. Agibalov, S. Yu. Kolodyazhny, E. A. Manuilova","doi":"10.3103/s0145875224700200","DOIUrl":"https://doi.org/10.3103/s0145875224700200","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The forms of salt rises occur under the influence of stresses developing in the Earth’s crust and can therefore be considered sensitive indicators of the interaction of geodynamic systems. The forms of salt rises, reflecting the superposition of these systems, arose in the North German Basin, in the Cis-Uralian Foredeep on the boundary with the Caspian Depression, and in the Pripyat Trough under the influence of various sources of stress and deformation. The mechanisms of such a superposition were both the formation of forms associated with the resulting addition of strain vectors and interference of forms associated with each geodynamic system individually.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739721","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700315
A. K. Mirinets, A. E. Rybalko, M. I. Aleshin, D. A. Subetto
Abstract
The article presents the results of seismoacoustic studies carried out in Petrozavodsk Bay of Lake Onega. The goal was to study a near-surface geological section. Seismoacoustic studies were done by the reflection method in a modified ultra-high-resolution seismic survey. The data were office processed and interpreted: five seismic complexes were identified and correlated with information on the lake’s structure, culminating in maps of all five identified reflectors covering all of Petrozavodsk Bay. It was possible to estimate the abundance and thickness of sediments corresponding to each complex.
{"title":"Structure of the Quaternary Sheet in Petrozavodsk Bay of Lake Onega According to Seismoacoustics","authors":"A. K. Mirinets, A. E. Rybalko, M. I. Aleshin, D. A. Subetto","doi":"10.3103/s0145875224700315","DOIUrl":"https://doi.org/10.3103/s0145875224700315","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article presents the results of seismoacoustic studies carried out in Petrozavodsk Bay of Lake Onega. The goal was to study a near-surface geological section. Seismoacoustic studies were done by the reflection method in a modified ultra-high-resolution seismic survey. The data were office processed and interpreted: five seismic complexes were identified and correlated with information on the lake’s structure, culminating in maps of all five identified reflectors covering all of Petrozavodsk Bay. It was possible to estimate the abundance and thickness of sediments corresponding to each complex.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739448","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700261
I. Ya. Bogatyreva, Yu. A. Kotochkova, N. S. Balushkina, O. V. Khotylev, M. M. Fomina, N. A. Tyurina, B. I. Yablonovskiy, G. A. Kalmykov
Abstract
The Bazhenov high-carbon formation is a set of marine pelitomorphic deposits enriched in organic matter, which accumulated under conditions of subsidence of the bottom of the sedimentary basin, which was not compensated by sediments. The formation contains hydrocarbons in its entire volume and is a promising source for expanding the hydrocarbon resource base. This article presents a set of the results of core studies and interpretation of well logging and seismic survey data for structural and facies typification of sections of the Bazhenov high-carbon formation throughout the area of its distribution. A multi-faceted approach to studying rocks has made it possible to divide the West Siberian basin into 13 structural-facies zones, each of which has its own structural features of the Bazhenov high-carbon formation section, including the total thickness, the presence of lithological and geophysical members and lithophysical types of rocks in the members, and the total concentration of organic carbon. In the future, this typification of sections will make it possible to simplify the modeling of the properties of Bazhenov high-carbon formation and the prediction of the most prospective areas.
{"title":"Structural-Facies Typification of Sections of the Bazhenov High-Carbon Formation of the West Siberian Basin","authors":"I. Ya. Bogatyreva, Yu. A. Kotochkova, N. S. Balushkina, O. V. Khotylev, M. M. Fomina, N. A. Tyurina, B. I. Yablonovskiy, G. A. Kalmykov","doi":"10.3103/s0145875224700261","DOIUrl":"https://doi.org/10.3103/s0145875224700261","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Bazhenov high-carbon formation is a set of marine pelitomorphic deposits enriched in organic matter, which accumulated under conditions of subsidence of the bottom of the sedimentary basin, which was not compensated by sediments. The formation contains hydrocarbons in its entire volume and is a promising source for expanding the hydrocarbon resource base. This article presents a set of the results of core studies and interpretation of well logging and seismic survey data for structural and facies typification of sections of the Bazhenov high-carbon formation throughout the area of its distribution. A multi-faceted approach to studying rocks has made it possible to divide the West Siberian basin into 13 structural-facies zones, each of which has its own structural features of the Bazhenov high-carbon formation section, including the total thickness, the presence of lithological and geophysical members and lithophysical types of rocks in the members, and the total concentration of organic carbon. In the future, this typification of sections will make it possible to simplify the modeling of the properties of Bazhenov high-carbon formation and the prediction of the most prospective areas.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739725","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}
Pub Date : 2024-07-17DOI: 10.3103/s0145875224700273
V. V. Churkina, Yu. A. Kotochkova, G. A. Kalmykov
Abstract
The article describes the sedimentation environments of Lower Cretaceous (Aptian–Albian) terrigenous deposits in the North Caspian. These rocks are oil and gas reservoirs and are characterized by an uneven distribution of the pelitic and silty fractions, which leads to a high content of residual water, low permeability, and poor consistency of the filtration-capacity properties with each other. A detailed lithological and facies analysis of the rocks was carried out for correct interpretation of geophysical data. The following marine environments predominated in the studied area in the Early Cretaceous: coastal, shallow marine, relatively shallow shelf with active hydrodynamics; relatively deep-water shelf with low hydrodynamics. The sections show a change from shallow to deeper facies and vice versa, which allows us to conclude periodic fluctuations in sea level. The results of lithological analysis clearly indicate the predominance of shallow marine and coastal sediments in the Aptian and deeper, shelf sediments in the Albian. Thus, we can suggest a sea transgression at the end of the Early Cretaceous and detect signs of it in the sections of Aptian–Albian deposits in the North Caspian.
{"title":"Sedimentation Environments of the Lower Cretaceous Deposits of the North Caspian","authors":"V. V. Churkina, Yu. A. Kotochkova, G. A. Kalmykov","doi":"10.3103/s0145875224700273","DOIUrl":"https://doi.org/10.3103/s0145875224700273","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article describes the sedimentation environments of Lower Cretaceous (Aptian–Albian) terrigenous deposits in the North Caspian. These rocks are oil and gas reservoirs and are characterized by an uneven distribution of the pelitic and silty fractions, which leads to a high content of residual water, low permeability, and poor consistency of the filtration-capacity properties with each other. A detailed lithological and facies analysis of the rocks was carried out for correct interpretation of geophysical data. The following marine environments predominated in the studied area in the Early Cretaceous: coastal, shallow marine, relatively shallow shelf with active hydrodynamics; relatively deep-water shelf with low hydrodynamics. The sections show a change from shallow to deeper facies and vice versa, which allows us to conclude periodic fluctuations in sea level. The results of lithological analysis clearly indicate the predominance of shallow marine and coastal sediments in the Aptian and deeper, shelf sediments in the Albian. Thus, we can suggest a sea transgression at the end of the Early Cretaceous and detect signs of it in the sections of Aptian–Albian deposits in the North Caspian.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739728","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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