南海北部湾盆地协调‒非协调供源样式与沉积交互作用耦合响应：以涠西南凹陷C洼为例

周子强; 朱红涛; 刘强虎; 刘圣

doi:10.3799/dqkx.2022.106

Volume 47 Issue 7

Jul. 2022

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Zhou Ziqiang, Zhu Hongtao, Liu Qianghu, Liu Sheng, 2022. Coupled Response of Concordant-Discordant Input Systems and Depositional Interactions within Beibuwan Basin, South China Sea: A Case Study from C Sag, Weixinan Depression. Earth Science, 47(7): 2521-2535. doi: 10.3799/dqkx.2022.106

Citation:

Zhou Ziqiang, Zhu Hongtao, Liu Qianghu, Liu Sheng, 2022. Coupled Response of Concordant-Discordant Input Systems and Depositional Interactions within Beibuwan Basin, South China Sea: A Case Study from C Sag, Weixinan Depression. Earth Science, 47(7): 2521-2535. doi: 10.3799/dqkx.2022.106

Citation:

Zhou Ziqiang, Zhu Hongtao, Liu Qianghu, Liu Sheng, 2022. Coupled Response of Concordant-Discordant Input Systems and Depositional Interactions within Beibuwan Basin, South China Sea: A Case Study from C Sag, Weixinan Depression. Earth Science, 47(7): 2521-2535. doi: 10.3799/dqkx.2022.106

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Coupled Response of Concordant-Discordant Input Systems and Depositional Interactions within Beibuwan Basin, South China Sea: A Case Study from C Sag, Weixinan Depression

doi: 10.3799/dqkx.2022.106

Zhou Ziqiang^{1, 2
,
,},
Zhu Hongtao^{1, 2
,
,},
Liu Qianghu^{1, 2},
Liu Sheng^{1, 2}

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-01-16
Publish Date: 2022-07-25

Abstract

Abstract

Lacustrine rift basin is characterized by multiple input systems and complex paleo-geomorphology, and a source-to-sink analysis can help improve sandstone prediction. Based on logging and 3D seismic data, this study distinguishes concordant and discordant input systems and establishes the spatio-temporal distribution pattern of depositional systems within the C Sag, Weixinan Depression. The results indicate that the C Sag was supplied by the northern and southern transverse input systems as well as the western axial system during deposition of the third member of Liushagang Formation, and the southern system can be further divided into three second-order subsystems (i.e., subsystems S-Ⅰ, S-Ⅱ, S-Ⅲ). The axial system with gentle catchment and wide valley was characterized as a concordant input system with steady flux and tractive flow, as manifested by a braided delta with correlative grain size and sand ratio. In contrast, the discordant transverse input system, with a steep catchment and incised valleys (e.g., sub-system S-Ⅱ) was characterized by sediment pulse and gravity flow, as manifested by basin floor fan and fan delta with thick mudstone intercalated with thin conglomerate-bearing layer. The axial braided delta developed in the lower part of third member of Liushagang Formation was distributed mostly in the northern C Sag, as a result of intensive transverse sediment contributions from southern Weixinan Low Uplift. The reduced sediment flux from transverse input system, however, resulted in southward shifted axial delta in the upper part of third member of Liushagang Formation. Through a source-to-sink analysis of the C Sag, this study demonstrates that different input systems and interactions between depositional systems have exerted important controls on the spatio-temporal distribution patterns of favorable sandstone, with implications for hydrocarbon explorations in C Sag and other lacustrine rift basins with similar characteristics.
- source - to - sink system,
- concordant system,
- discordant system,
- depositional interaction,
- Weixinan Depression,
- petroleum geology

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Coupled Response of Concordant-Discordant Input Systems and Depositional Interactions within Beibuwan Basin, South China Sea: A Case Study from C Sag, Weixinan Depression

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