Volcanic sedimentation of Cretaceous Jiufotang Formation in the Chaoyang Basin and its impact on organic matter enrichment

被引：0

作者：

Zhang J. ^{[1
]}

Jiang Z. ^{[1
]}

Xu J. ^{[2
]}

Wei S. ^{[1
]}

Song L. ^{[3
]}

Liu T. ^{[1
]}

Shen Z. ^{[1
]}

Jiang X. ^{[4
]}

Li Y. ^{[5
,6
]}

Zhang X. ^{[7
]}

机构：

[1] School of Energy Resources, China University of Geosciences(Beijing), Beijing

[2] School of Ocean Sciences, China University of Geosciences(Beijing), Beijing

[3] Daqing Oilfield Production Technology Institute, Daqing

[4] Beijing Yalong Technology Development Co., Ltd., Beijing

[5] Shenyang Geological Survey Center, China Geological Survey, Shenyang

[6] MNR Observation and Research Station of Mesozoic Stratigraphic System in Western Liaoning, Shenyang

[7] Exploration and Development Research Institute, Northeast Oil & Gas Branch, SINOPEC, Changchun

来源：

Earth Science Frontiers | 2024年 / 31卷 / 03期

关键词：

Chaoyang Basin; genesis mechanism; Jiufotang Formation; lithofacies type and combination; organic matter enrichment;

D O I：

10.13745/j.esf.sf.2023.9.22

中图分类号：

学科分类号：

摘要：

The Chaoyang Basin in western Liaoning, situated in the eastern section of the Yanshan tectonic belt, is a fault basin from the Mesozoic era on the periphery of Songliao. The level of exploration understanding in this region is relatively low. Previous studies on the Lower Cretaceous Jiufotang Formation in the Chaoyang Basin primarily focused on lacustrine deposits, overlooking the significant impact of volcanic events on the basin's sedimentation. To address this gap, regional geological data investigation, drilling core description, core thin section data observation, and test data analysis were conducted. By classifying pyroclastic rocks into sedimentary pyroclastic rocks and pyroclastic sedimentary rocks based on their content and subdividing them into 11 lithofacies types and 9 lithofacies combinations according to particle size, composition, and sedimentary structure characteristics, five causal mechanisms were proposed:pyroclastic flow, volcanic hyperpycnal flow, volcanic ash heterogeneous light flow, hydrothermal intrusion, and microbial induction. The establishment of the volcanic-lake sedimentary model of the Jiufotang Formation in the Chaoyang Basin, based on volcanic sedimentary sequences and core observation findings, offers a theoretical foundation for oil and gas resource exploration and development in the area. Research indicates that volcanic material positively influences organic matter enrichment in the lake basin. Geochemical tests on source rocks of the Jiufotang Formation in the Chaoyang Basin revealed that samples containing volcanic fine particles involved in sedimentation exhibited better organic matter abundance and enrichment. Given the similar volcanic activity geological background in other basins within the Yanshan tectonic belt, these findings also serve as valuable comparative references for sedimentology and oil and gas resource research in those regions. © 2024 Science Frontiers editorial department. All rights reserved.

引用

页码：284 / 297

页数：13

共 10 条

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