Pub Date : 2024-02-07DOI: 10.3103/s014587522306011x
D. A. Marunova, N. V. Pronina, A. G. Kalmykov, D. A. Ivanova, G. G. Savostin, A. P. Vaitechovich, G. A. Kalmykov
Abstract
The results of the studies of organic matter in the rocks of the Bazhenov Formation in the territory of the Frolov oil and gas region of the West Siberian basin are presented. The maceral composition of the sediments is represented by bituminite and alginite, redeposited vitrinite, as well as bioclasts: onychites and calcespheres organic matter. The investigation was focused on bioclasts. Their coal petrographic characteristics and change in the process of catagenesis are described; qualitative parameters to access the degree of bioclast maturity are established; as well, an initial formula for converting the onychite reflectance to the equivalent of vitrinite reflectance is proposed.
{"title":"The Evolution of Bioclasts during Catagenesis in Rocks of the Bazhenov Formation in the Territory of the Frolov Oil and Gas Region","authors":"D. A. Marunova, N. V. Pronina, A. G. Kalmykov, D. A. Ivanova, G. G. Savostin, A. P. Vaitechovich, G. A. Kalmykov","doi":"10.3103/s014587522306011x","DOIUrl":"https://doi.org/10.3103/s014587522306011x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the studies of organic matter in the rocks of the Bazhenov Formation in the territory of the Frolov oil and gas region of the West Siberian basin are presented. The maceral composition of the sediments is represented by bituminite and alginite, redeposited vitrinite, as well as bioclasts: onychites and calcespheres organic matter. The investigation was focused on bioclasts. Their coal petrographic characteristics and change in the process of catagenesis are described; qualitative parameters to access the degree of bioclast maturity are established; as well, an initial formula for converting the onychite reflectance to the equivalent of vitrinite reflectance is proposed.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765841","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 : 2024-02-07DOI: 10.3103/s0145875223060066
I. V. Egorov, M. A. Bolshakova, O. V. Krylov
Abstract
The study of the prospects in the central part of the Nepsko-Botuobinskaya Anteclise is focused on the subsalt oil and gas bearing horizons of Group B (Osinsky, Upper Ust-Kutsky, Lower Ust-Kutsky, and Preobrazhensky) and Group V (terrigenous formations of Vendian age). However, higher, in the Lower–Middle Cambrian carbonate-halogen deposits, there are also promising horizons of Group A (Kelorsky, Atovsky, Khristoforovsky, and Balykhtinsky) whose sufficient oil and gas content was confirmed in the neighboring Angara-Lena stage and in the north of the Nepsko-Botuobinskaya Anteclise and its adjacent structures. This paper examines the results of geochemistry tests of oil samples from the Osinsky horizon (layer B1) and the nameless dolomite layer located between the salts in the lower part of the Upper Usolskaya Subformation, which was previously considered gas-bearing at best. The tests conducted by the method of chromatography-mass spectrometry and the comparison of geochemical parameters of oils from different reservoirs show the similarity of hydrocarbon fluids of the Upper Usolskaya Subformation and of underlying pay horizons, which makes it possible to attribute them to a single oil and gas bearing system.
摘要 对 Nepsko-Botuobinskaya Anteclise 中部地区前景的研究主要集中在 B 组（Osinsky、Upper Ust-Kutsky、Lower Ust-Kutsky 和 Preobrazhensky）和 V 组（Vendian 时代的陆相地层）的盐下含油和含气地层。然而，在更高的下-中寒武统碳酸盐-卤化物矿床中，也有前景看好的 A 组地层（Kelorsky、Atovsky、Khristoforovsky 和 Balykhtinsky），其充足的石油和天然气含量已在邻近的安加拉-勒拿河期和 Nepsko-Botuobinskaya Anteclise 北部及其邻近构造中得到证实。本文研究了对来自奥辛斯基地层（B1层）和位于上乌索尔斯卡亚岩层下部盐类之间的无名白云岩层的石油样本进行地球化学测试的结果。用色谱-质谱法进行的测试以及对不同储油层的石油地质化学参数进行的比较表明，上乌索列斯卡亚岩层和下层地层的碳氢化合物流体具有相似性，因此可以将它们归属于一个单一的含油气系统。
{"title":"A Сomparative Analysis of Oils from Carbonate Sediments of the Upper Usolskaya Subformation and the Vendian–Cambrian Pay Horizons in the Central Part of the Nepsko-Botuobinskaya Anteclise","authors":"I. V. Egorov, M. A. Bolshakova, O. V. Krylov","doi":"10.3103/s0145875223060066","DOIUrl":"https://doi.org/10.3103/s0145875223060066","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study of the prospects in the central part of the Nepsko-Botuobinskaya Anteclise is focused on the subsalt oil and gas bearing horizons of Group B (Osinsky, Upper Ust-Kutsky, Lower Ust-Kutsky, and Preobrazhensky) and Group V (terrigenous formations of Vendian age). However, higher, in the Lower–Middle Cambrian carbonate-halogen deposits, there are also promising horizons of Group A (Kelorsky, Atovsky, Khristoforovsky, and Balykhtinsky) whose sufficient oil and gas content was confirmed in the neighboring Angara-Lena stage and in the north of the Nepsko-Botuobinskaya Anteclise and its adjacent structures. This paper examines the results of geochemistry tests of oil samples from the Osinsky horizon (layer B1) and the nameless dolomite layer located between the salts in the lower part of the Upper Usolskaya Subformation, which was previously considered gas-bearing at best. The tests conducted by the method of chromatography-mass spectrometry and the comparison of geochemical parameters of oils from different reservoirs show the similarity of hydrocarbon fluids of the Upper Usolskaya Subformation and of underlying pay horizons, which makes it possible to attribute them to a single oil and gas bearing system.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765836","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 : 2024-02-07DOI: 10.3103/s0145875223050149
A. M. Surinsky, A. Yu. Guzhikov, D. A. Shelepov, R. R. Gabdullin
Abstract
Data on the magnetic properties and composition of chemical elements in the stratotype of the Belogrodni Formation (Danian Stage) were obtained and their cyclostratigrapic analysis was carried out. Based on the Fourier transforms of vertical sequences of petromagnetic and geochemical parameters, cycles corresponding to the long and short eccentricity periods of Earth’s orbit were identified in the section and the sedimentation time (~2.1 myr) and glauconite formation rate (~1 cm/kyr) were estimated.
{"title":"Cyclostratigraphic Analysis Results of the Rock Magnetic and Geochemical Characteristics of Belogrodni Formation Stratotype (Danian Stage in the Volga Right Bank Area Near Saratov)","authors":"A. M. Surinsky, A. Yu. Guzhikov, D. A. Shelepov, R. R. Gabdullin","doi":"10.3103/s0145875223050149","DOIUrl":"https://doi.org/10.3103/s0145875223050149","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Data on the magnetic properties and composition of chemical elements in the stratotype of the Belogrodni Formation (Danian Stage) were obtained and their cyclostratigrapic analysis was carried out. Based on the Fourier transforms of vertical sequences of petromagnetic and geochemical parameters, cycles corresponding to the long and short eccentricity periods of Earth’s orbit were identified in the section and the sedimentation time (~2.1 myr) and glauconite formation rate (~1 cm/kyr) were estimated.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765837","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 : 2024-02-07DOI: 10.3103/s0145875223050101
S. P. Pozdniakov, V. V. Vedyashkina, E. A. Filimonova, N. I. Pozdniakova
Abstract
We analyzed long-term and annual groundwater level fluctuations in the Kamennaya Steppe Nature Reserve in Voronezh Region based on monitoring data from the Dokuchaev pit. This pit is a unique groundwater monitoring site with the longest observation period in Russia and Europe, amounting to 130 years. The specific feature of groundwater formation of the Quaternary horizon, penetrated by the the pit, is that the annual and multi-year regime of groundwater levels is determined by the dynamics of infiltration water exchange between groundwater and the surface. The analysis is based on an extensive factual record, including a long-term series of hydrogeological observations and meteorological database. A set of methods and approaches was used: statistical methods, correlation analysis, SURFBAL water balance calculations, etc. Cross-correlation analysis of water levels in the pit and other observation wells on the Quaternary horizon revealed that the Dokuchaev pit is a representative observation point to assess the patterns of fluctuations in groundwater levels in the Kamennaya Steppe. Based on the analysis of time series it was found that the observed dynamics of water level in the pit follows the course of the main regime-forming factors, i.e., precipitation and potential evapotranspiration, determining the excess or deficit of water for infiltration in a multi-year framework. An extreme decrease of the water level in the pit to its partial drying in 2020–2022, as observed during the last 15 years, relates to dynamics of these factors. Based on model studies, it was shown that there is a gradual transformation of the annual regime of fluctuations of water level in the pit in the late 20th and early 21st century compared with the mid-20th century due to changes in conditions of spring–winter absorption of moisture from the surface of the earth and the formation of infiltration recharge. However, it is not as significant as, for example, the transformation of river hydrographs in the Don basin.
{"title":"A Retrospective Analysis of Long-Term Groundwater Level Fluctuations in the Dokuchaev Pit in the Kamennaya Steppe Nature Reserve","authors":"S. P. Pozdniakov, V. V. Vedyashkina, E. A. Filimonova, N. I. Pozdniakova","doi":"10.3103/s0145875223050101","DOIUrl":"https://doi.org/10.3103/s0145875223050101","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We analyzed long-term and annual groundwater level fluctuations in the Kamennaya Steppe Nature Reserve in Voronezh Region based on monitoring data from the Dokuchaev pit. This pit is a unique groundwater monitoring site with the longest observation period in Russia and Europe, amounting to 130 years. The specific feature of groundwater formation of the Quaternary horizon, penetrated by the the pit, is that the annual and multi-year regime of groundwater levels is determined by the dynamics of infiltration water exchange between groundwater and the surface. The analysis is based on an extensive factual record, including a long-term series of hydrogeological observations and meteorological database. A set of methods and approaches was used: statistical methods, correlation analysis, SURFBAL water balance calculations, etc. Cross-correlation analysis of water levels in the pit and other observation wells on the Quaternary horizon revealed that the Dokuchaev pit is a representative observation point to assess the patterns of fluctuations in groundwater levels in the Kamennaya Steppe. Based on the analysis of time series it was found that the observed dynamics of water level in the pit follows the course of the main regime-forming factors, i.e., precipitation and potential evapotranspiration, determining the excess or deficit of water for infiltration in a multi-year framework. An extreme decrease of the water level in the pit to its partial drying in 2020–2022, as observed during the last 15 years, relates to dynamics of these factors. Based on model studies, it was shown that there is a gradual transformation of the annual regime of fluctuations of water level in the pit in the late 20th and early 21st century compared with the mid-20th century due to changes in conditions of spring–winter absorption of moisture from the surface of the earth and the formation of infiltration recharge. However, it is not as significant as, for example, the transformation of river hydrographs in the Don basin.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765953","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 : 2024-02-07DOI: 10.3103/s0145875223060042
I. E. Bolshakov, Yu. V. Frolova, S. N. Rychagov, M. S. Chernov
Abstract
The features of the transformation of andesites of the East Pauzhetka thermal field under the influence of the argillization process are studied based on a number of samples with different degrees of alteration, which were taken from boreholes and outcrops near the study object. The main patterns of changes in the composition and physical and mechanical properties of andesites have been revealed. A schematic diagram of the structure of the thermal field in section has been compiled; this diagram distinguishes three horizons from bottom to top, showing an increase in the degree of hydrothermal transformation: altered andesites, metasomatic breccias, and hydrothermal clays.
{"title":"Patterns of Change in the Composition and Physical and Mechanical Properties of Andesites of the East Pauzhetka Thermal Field under the Influence of Argillization (Southern Kamchatka)","authors":"I. E. Bolshakov, Yu. V. Frolova, S. N. Rychagov, M. S. Chernov","doi":"10.3103/s0145875223060042","DOIUrl":"https://doi.org/10.3103/s0145875223060042","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The features of the transformation of andesites of the East Pauzhetka thermal field under the influence of the argillization process are studied based on a number of samples with different degrees of alteration, which were taken from boreholes and outcrops near the study object. The main patterns of changes in the composition and physical and mechanical properties of andesites have been revealed. A schematic diagram of the structure of the thermal field in section has been compiled; this diagram distinguishes three horizons from bottom to top, showing an increase in the degree of hydrothermal transformation: altered andesites, metasomatic breccias, and hydrothermal clays.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766189","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 : 2024-02-07DOI: 10.3103/s0145875223050046
A. D. Dzyublo, A. V. Lobusev, A. Yu. Makarova, A. N. Gumerova
Abstract
This paper presents the results of studies of the lithological-facies composition and paleogeographic environments of the formation of the main oil and gas complexes in the northeastern part of the Sakhalin shelf. Based on the results of core studies, an assessment of the reservoir and screening properties of the rocks, which make up the Lower Miocene stratigraphic complex, was carried out. The data on the lithological composition of reservoirs, the nature of cement and the composition of seals for 12 deep exploration wells drilled on the Sakhalin shelf are presented. The studies we carried out made it possible to predict changes in the lithological-facies composition and reservoir properties of the rocks that make up the main oil and gas complexes. There are three categories of zones with different indicators of filtration–capacitive properties.
{"title":"The Lithological and Paleogeographic Features of the Formation of the Lower Miocene of the Northeastern Shelf of Sakhalin Island","authors":"A. D. Dzyublo, A. V. Lobusev, A. Yu. Makarova, A. N. Gumerova","doi":"10.3103/s0145875223050046","DOIUrl":"https://doi.org/10.3103/s0145875223050046","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper presents the results of studies of the lithological-facies composition and paleogeographic environments of the formation of the main oil and gas complexes in the northeastern part of the Sakhalin shelf. Based on the results of core studies, an assessment of the reservoir and screening properties of the rocks, which make up the Lower Miocene stratigraphic complex, was carried out. The data on the lithological composition of reservoirs, the nature of cement and the composition of seals for 12 deep exploration wells drilled on the Sakhalin shelf are presented. The studies we carried out made it possible to predict changes in the lithological-facies composition and reservoir properties of the rocks that make up the main oil and gas complexes. There are three categories of zones with different indicators of filtration–capacitive properties.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888245","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 : 2024-02-07DOI: 10.3103/s0145875223050095
S. I. Merenkova, I. V. Korovnikov, R. R. Gabdullin
Abstract
The Verkhnyaya Lena Group (Є2–3vl) has been studied in a section on the right bank of the Malaya Chuya River. Concentrations of main oxides and some trace elements (Cr, V, Ni, Cu, Zn, Rb, Sr, Zr, Ba, U, Th, Y, Nb, and Cl) have been determined in samples using an X-ray spectral fluorescence (XRF) analysis. The normative mineral composition has been determined based on the results of the XRF analysis using the MINLITH software. Based on geochemical data, intervals of change in the weathering features (physical/chemical and arid/humid weathering) are clearly differentiated in the denudation area, which are fixed by variations in the values of the Al2O3/K2O and Ln(Al2O3/Na2O) ratios and concentrations of V, Cu, Zn, Rb, and Ni, as well as the normative mineral composition. Apparently, Cr was transported to the basin exclusively by the aeolian process in this case and marks periods of increased wind transport intensity. Under conditions of tectonic activation and progressive isolation of the Upper Lena paleobasin, the described lithological and geochemical features provide some information about the climate changes that accompanied these events.
摘要 在马来亚楚雅河右岸的一个地段研究了上列宁格勒勒拿河组（Є2-3vl）。利用 X 射线光谱荧光 (XRF) 分析法测定了样品中主要氧化物和一些微量元素（铬、钒、镍、铜、锌、铷、锶、锆、钡、铀、钍、钇、铌和氯）的浓度。根据 XRF 分析结果，使用 MINLITH 软件确定了标准矿物成分。根据地球化学数据，剥蚀区风化特征（物理/化学风化和干旱/湿润风化）的变化区间被清晰地区分，并通过 Al2O3/K2O 和 Ln（Al2O3/Na2O）比值、V、Cu、Zn、Rb 和 Ni 的浓度以及标准矿物成分的变化加以固定。显然，在这种情况下，铬完全是通过风化过程迁移到盆地的，这标志着风力迁移强度增加的时期。在上勒拿古盆地的构造激活和逐渐隔离的条件下，所描述的岩石学和地球化学特征提供了一些有关伴随这些事件发生的气候变化的信息。
{"title":"The Lithological and Geochemical Features and Paleoclimatic Conditions for the Formation of the Verkhnyaya Lena Group (Southeast of the Siberian Platform)","authors":"S. I. Merenkova, I. V. Korovnikov, R. R. Gabdullin","doi":"10.3103/s0145875223050095","DOIUrl":"https://doi.org/10.3103/s0145875223050095","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Verkhnyaya Lena Group (Є<sub>2–3</sub><i>vl</i>) has been studied in a section on the right bank of the Malaya Chuya River. Concentrations of main oxides and some trace elements (Cr, V, Ni, Cu, Zn, Rb, Sr, Zr, Ba, U, Th, Y, Nb, and Cl) have been determined in samples using an X-ray spectral fluorescence (XRF) analysis. The normative mineral composition has been determined based on the results of the XRF analysis using the MINLITH software. Based on geochemical data, intervals of change in the weathering features (physical/chemical and arid/humid weathering) are clearly differentiated in the denudation area, which are fixed by variations in the values of the Al<sub>2</sub>O<sub>3</sub>/K<sub>2</sub>O and Ln(Al<sub>2</sub>O<sub>3</sub>/Na<sub>2</sub>O) ratios and concentrations of V, Cu, Zn, Rb, and Ni, as well as the normative mineral composition. Apparently, Cr was transported to the basin exclusively by the aeolian process in this case and marks periods of increased wind transport intensity. Under conditions of tectonic activation and progressive isolation of the Upper Lena paleobasin, the described lithological and geochemical features provide some information about the climate changes that accompanied these events.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887971","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 : 2024-02-07DOI: 10.3103/s0145875223060054
G. A. Chelnokov, N. A. Kharitonova, V. Yu. Lavrushin, A. S. Aydarkozhina, Guodong Zheng
Abstract
This work presents original data on the contents and distribution of major and rare earth elements in the waters from 26 mud volcanoes within the Kerch–Taman region. In terms of the chemical composition, the studied mud volcanic waters are the Na–Cl and Na–HCO3–Cl types. However, the Cl/Br, Na/Cl, and Y/ Ho ratios indicate three main genetic groups of volcanoes. It was found that the contents of the rare earth elements in the aqueous phase of mud volcanoes are low (fractions of μg/L) and are distinguished by negative cerium anomalies and positive europium and holmium anomalies. The highest REE concentrations are observed in the mud volcanoes located within the oldest Cretaceous sediments in the area of fault influence. As the distance from the Mesozoic source ΣREE dramatically decreases, it was revealed that the free CO2 content in the aqueous phase regulates the REE content in waters and the cerium and europium anomalies.
{"title":"Rare Earth Elements in the Aqueous Phase of Mud Volcanoes of the Kerch-Taman Region","authors":"G. A. Chelnokov, N. A. Kharitonova, V. Yu. Lavrushin, A. S. Aydarkozhina, Guodong Zheng","doi":"10.3103/s0145875223060054","DOIUrl":"https://doi.org/10.3103/s0145875223060054","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This work presents original data on the contents and distribution of major and rare earth elements in the waters from 26 mud volcanoes within the Kerch–Taman region. In terms of the chemical composition, the studied mud volcanic waters are the Na–Cl and Na–HCO<sub>3</sub>–Cl types. However, the Cl/Br, Na/Cl, and Y/ Ho ratios indicate three main genetic groups of volcanoes. It was found that the contents of the rare earth elements in the aqueous phase of mud volcanoes are low (fractions of μg/L) and are distinguished by negative cerium anomalies and positive europium and holmium anomalies. The highest REE concentrations are observed in the mud volcanoes located within the oldest Cretaceous sediments in the area of fault influence. As the distance from the Mesozoic source ΣREE dramatically decreases, it was revealed that the free CO<sub>2</sub> content in the aqueous phase regulates the REE content in waters and the cerium and europium anomalies.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765842","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 : 2024-02-07DOI: 10.3103/s014587522306008x
D. D. Kozhanov, M. A. Bolshakova
Abstract
This article presents data on the history of the discovery of oil and gas deposits within the central and northern parts of the Volga–Ural oil and gas basin. On the basis of published scientific and stock literature, the evolution of geological thought on the issue of identifying oil sources is traced. A special role is assigned to the history of studying the geological structure and oil and gas potential of the Riphean–Vendian (Precambrian) complex. The work contains information on scientific schools of the past and present.
{"title":"A Brief History of the Oil and Gas Potential of the Volga–Ural Basin. A View from the 21st Century","authors":"D. D. Kozhanov, M. A. Bolshakova","doi":"10.3103/s014587522306008x","DOIUrl":"https://doi.org/10.3103/s014587522306008x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article presents data on the history of the discovery of oil and gas deposits within the central and northern parts of the Volga–Ural oil and gas basin. On the basis of published scientific and stock literature, the evolution of geological thought on the issue of identifying oil sources is traced. A special role is assigned to the history of studying the geological structure and oil and gas potential of the Riphean–Vendian (Precambrian) complex. The work contains information on scientific schools of the past and present.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765848","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 : 2024-02-07DOI: 10.3103/s0145875223060133
R. M. Sadirov, A. B. Yusupov, Sh. V. Usmanova, A. V. Tevelev
Abstract
The metasomatic rocks of gold-ore deposits of the Auminzatau Mountains (Central Kyzylkum), which are similar in mineral composition and their features of the formation, are distinguished. The corresponding stages of ore mineralization are associated with certain types of metasomatic rocks, which are their typomorphic signs. They reflect the features of the evolution of the stages of a unified mineral-forming system, which can be used as search criteria.
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