Structure, formation conditions, oil and gas potential of Domanicoid high-carbon formation in the Central and South-Eastern Parts of the Volga-Ural basin

IF 0.8 Q3 ENGINEERING, PETROLEUM Georesursy Pub Date : 2023-06-30 DOI:10.18599/grs.2023.2.9
A. Zavyalova, M. Karpushin, A. Stoupakova, A. Kalmykov, V. Chupakhina, N. I. Korobova, Mariya S. Borisova, K. Radchenko
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Abstract

The article discusses the structure and formation conditions of the domanicoid high-carbon formation (VUF) within the central and southeastern parts of the Volga-Ural basin. The presented results of the analysis of the structure, conditions of formation and oil and gas content of domanicoid deposits are a generalization of the accumulated knowledge obtained during the research of the authors in certain regions and areas. The regional geological model of the formation of the domanicoid complex was created based on the results of seismostratigraphic and cyclostratigraphic analyzes. In the structure of the Middle Frasnian – Tournaisian domanicoid deposits, three different areas are distinguished, differing in composition, structure, thickness, and formation conditions –the carbonate platform, the intrashelf depression and its slopes. The revealed cyclicity in the structure of the complex showed that the section consists of 4 large cyclites, the accumulation of which occurred at the stage of changes in the relative sea level. An analysis of the material composition of the deposits made it possible to identify various sedimentation environments and their characteristic strata, which unite lithological units, within each large cyclite. Geochemical and petrophysical studies of the rocks of the domanicoid VUF made it possible to assess the oil and gas potential, identify the intervals containing the largest amount of organic matter, and intervals of reservoir rocks in the context of the studied deposits.
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伏尔加乌拉尔盆地中东南部Domanicoid高碳组构造、形成条件及油气潜力
本文讨论了伏尔加-乌拉尔盆地中部和东南部圆顶状高碳地层的结构和形成条件。所提出的对圆顶状矿床的结构、形成条件和油气含量的分析结果是作者在某些地区和地区研究过程中积累的知识的概括。根据地震地层学和旋回地层学的分析结果,建立了圆顶状杂岩形成的区域地质模型。在中Frasnian-Tournaisian圆顶状矿床的结构中,区分了三个不同的区域,其组成、结构、厚度和形成条件不同——碳酸盐岩平台、架内凹陷及其斜坡。该杂岩结构中揭示的旋回性表明,该剖面由4个大型旋回组成,其聚集发生在相对海平面变化阶段。通过对矿床物质成分的分析,可以确定各种沉积环境及其特征地层,这些沉积环境和地层将每个大型旋回内的岩性单元统一起来。圆顶状VUF岩石的地球化学和岩石物理研究使评估油气潜力、确定含有最大有机物的层段以及所研究矿床中的储层岩石层段成为可能。
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来源期刊
Georesursy
Georesursy ENGINEERING, PETROLEUM-
CiteScore
1.50
自引率
25.00%
发文量
49
审稿时长
16 weeks
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