珠江口盆地白云凹陷文昌组构造‒沉积响应关系

郭伟; 徐国强; 柳保军; 向绪洪; 刘冬青; 张博

doi:10.3799/dqkx.2022.156

Volume 47 Issue 7

Jul. 2022

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Guo Wei, Xu Guoqiang, Liu Baojun, Xiang Xuhong, Liu Dongqing, Zhang Bo, 2022. Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag, Pearl River Mouth Basin. Earth Science, 47(7): 2433-2453. doi: 10.3799/dqkx.2022.156

Citation:

Guo Wei, Xu Guoqiang, Liu Baojun, Xiang Xuhong, Liu Dongqing, Zhang Bo, 2022. Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag, Pearl River Mouth Basin. Earth Science, 47(7): 2433-2453. doi: 10.3799/dqkx.2022.156

Citation:

Guo Wei, Xu Guoqiang, Liu Baojun, Xiang Xuhong, Liu Dongqing, Zhang Bo, 2022. Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag, Pearl River Mouth Basin. Earth Science, 47(7): 2433-2453. doi: 10.3799/dqkx.2022.156

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Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag, Pearl River Mouth Basin

doi: 10.3799/dqkx.2022.156

1.
Shenzhen Branch of China National Offshore Oil Corporation Ltd., Shenzhen 518054, China
2.
College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2021-09-26
Publish Date: 2022-07-25

Abstract

Abstract

Based on 3D seismic data, drilling and logging data, the tectonic evolution and its controlled sedimentary filling process of Wenchang Formation in Baiyun Sag were studied in detail by using new methods such as the restoration of original form structure section, enhanced seismic facies analysis and seismic scanning interpretation of sand body in order to explore the structure-sedimentary response relationship of faulted lake basin. The study shows that in response to the activity process of "weak-very strong-relatively strong-weak" of sag-controlling faults, Baiyun Sag experienced four tectonic evolution stages during the Wenchang Formation: initial fault depression stage (WCSQ1), early stage of strong fault depression (WCSQ2), late stage of strong fault depression (WCSQ3) and weak fault depression stage (WCSQ4, WCSQ5). Correspondingly, Baiyun Main Sag underwent the sedimentary evolution processes of fluvial-lacustrine, ultra-deep lake occurrence, ultra-deep lake filling, deep lake-shallow lake occurrence. The northern gentle slope zone located on the tilting side of rotating fault block mainly developed a fluvial-shallow lake transitional environment and a braided river delta depositional system of large-medium scale. The southern steep slope zone located on the plunging side of rotating fault block mainly developed a semi-deep lacustrine to deep lacustrine environment and a nearshore subaqueous fan-fan delta depositional system. The center of lake basin mainly developed a deep lake-ultra-deep lake environment and argillaceous deposits. The deposits of turbidite fan were developed around the deep lake. However, the Baiyun East Sag appeared as a landform of multiple uplift-depression formed by steep slope and magmatic underplating, and mainly developed small-scale inshore subaqueous fan-fan delta sedimentary system with volcaniclastic sediments. The porosity of sand bodies of Wenchang Formation was jointly controlled by the activity intensity of sag-controlling faults and magma, provenance system and paleogeographic characteristics of secondary depressions in Baiyun Sag.
- faulted lake basin,
- extensional structure,
- tectonic evolution,
- sedimentary system,
- sedimentary filling evolution,
- Wenchang Formation,
- Baiyun Sag,
- marine geology

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Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag, Pearl River Mouth Basin

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