地球动力学

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2022-06-28 DOI:10.23939/jgd2022.02.036
N. Radkovets, Y. Koltun
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引用次数: 0

摘要

意图本研究的目的是研究东欧地台西南斜坡志留系-下泥盆系(Lochkovian)碳酸盐-粘土沉积杂岩。它的形成是巴尔蒂卡南部大陆边缘岩性记录中单一地球动力学和沉积事件循环的结果。方法论该研究基于测井对比、岩芯样品的岩性和地球化学调查以及岩相薄片分析。所获得的结果用于建立所研究地层物质组成在时间和空间上的变化模式,以确定志留系-早泥盆纪东欧平台西南斜坡大陆边缘的盆地发展动力学。后果据证实,碳酸盐-粘土序列的形成代表了一个单一的沉积旋回,是巴尔蒂卡南部大陆边缘发生的复杂地球动力学、沉积和古气候事件的结果。志留纪的特征是盆地近端底栖生物的密集发育和珊瑚礁结构的形成,远端富含分散有机物的粘土碳酸盐岩泥。早泥盆纪,碳酸盐生物沉积作用在整个盆地持续存在。碳酸盐最大含量(80–98%)证明了盆地沉积记录中存在礁构造。碳酸盐含量较低的特征是泥灰岩(40-55%)和生物碎屑石灰岩(56-75%),它们构成志留系序列的主要部分。泥盆纪洛奇科维阶剖面无礁体构造,岩石中碳酸钙含量在45%至83%之间。志留系泥岩和钙质泥岩中CaCO3含量在5%-15%之间。独创性岩性、地球化学、地质地球物理和古地理调查的应用综合体使我们能够研究志留系-早泥盆世的沉积盆地动力学,并评估这些地层参与油气烃生成的可能性。实际意义。研究结果表明,研究区志留系和下泥盆系沉积岩的碳酸盐-粘土杂岩可被视为一个独立的油气系统,包括烃源岩、储集岩以及可能的常规油气藏和非常规油气藏。
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GEODYNAMICS
Purpose. The objective of this study is the investigation of the Silurian-Lower Devonian (Lochkovian) carbonate-clay sedimentary complex of the southwestern slope of the East-European platform. Its formation was the result of a single cycle of geodynamic and sedimentary events in the lithological record of the southern continental margin of Baltica. Methodology. The study is based on well-logs correlation, lithological and geochemical investigations of core samples, and petrographic thin sections analysis. The obtained results were used to establish patterns of changes in the material composition of the studied strata in time and space in order to determine the basin development dynamics of the continental margin of the Eastern European platform southwestern slope in the Silurian-Early Devonian. Results. It is established that the formation of the carbonate-clay sequence represents a single sedimentary cycle and was the result of a complex of geodynamic, depositional and paleoclimatic events that took place on the Baltica southern continental margin. The Silurian period was characterized by intensive development of benthic organisms and reef structure formation in the proximal part of the basin and clay-carbonate muds enriched with dispersed organic matter in its distal part. In the Early Devonian, carbonate biogenic sedimentation continued throughout the basin. The carbonate maximum content (80–98%) proves the existence of the reef constructions in the basin sedimentary record. Lower values of carbonate content are characteristic of marls (40–55%) and biodetritic limestones (56–75%), which make up the main part of the Silurian sequence. There are no reef constructions in the section of the Lochkovian stage of Devonian, and the calcium carbonate content in the rocks varies from 45 to 83%. The content of CaCO3 in mudstones and calcareous mudstones of the Silurian varies from 5 to 15%. Originality. The applied complex of lithological, geochemical, geological-geophysical and paleogeographic investigations allowed studying the sedimentary basin dynamics in the Silurian-Early Devonian with the assessment of the possibility of participation of these strata in oil and gas hydrocarbons generation. Practical significance. The obtained results show that the carbonate-clay complex of sedimentary rocks of the Silurian and Lower Devonian (Lochkovian) of the studied region can be considered as a separate petroleum system, including source rocks, reservoir rocks and possible conventional and unconventional oil and gas accumulations.
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Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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