南海北部珠江口盆地西南段断裂特征与成因讨论

王嘉; 栾锡武; 何兵寿; 冉伟民; 张豪; 杨佳佳

doi:10.3799/dqkx.2020.381

Volume 46 Issue 3

Mar. 2021

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Article Navigation > Earth Science > 2021 > 46(3): 916-928

Wang Jia, Luan Xiwu, He Bingshou, Ran Weimin, Zhang Hao, Yang Jiajia, 2021. Characteristics and Genesis of Faults in Southwestern Pearl River Mouth Basin, Northern South China Sea. Earth Science, 46(3): 916-928. doi: 10.3799/dqkx.2020.381

Citation:

Wang Jia, Luan Xiwu, He Bingshou, Ran Weimin, Zhang Hao, Yang Jiajia, 2021. Characteristics and Genesis of Faults in Southwestern Pearl River Mouth Basin, Northern South China Sea. Earth Science, 46(3): 916-928. doi: 10.3799/dqkx.2020.381

Citation:

Wang Jia, Luan Xiwu, He Bingshou, Ran Weimin, Zhang Hao, Yang Jiajia, 2021. Characteristics and Genesis of Faults in Southwestern Pearl River Mouth Basin, Northern South China Sea. Earth Science, 46(3): 916-928. doi: 10.3799/dqkx.2020.381

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Characteristics and Genesis of Faults in Southwestern Pearl River Mouth Basin, Northern South China Sea

doi: 10.3799/dqkx.2020.381

Wang Jia^{1
,
,},
Luan Xiwu^{2, 3
,
,},
He Bingshou^{1, 3},
Ran Weimin^{2, 3},
Zhang Hao^{2, 3, 4},
Yang Jiajia²

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
4.
School of Geosciences, China University of Petroleum, Qingdao 266580, China

Received Date: 2020-12-21
Publish Date: 2021-03-15

Abstract

Abstract

The Pearl River Mouth basin is a rift basin developed in the Cenozoic on the continental margin of the northern South China Sea, which is located in the ocean-continent transition zone with rich oil and gas resources. It is very important to analyze the internal fracture characteristics of the Pearl River Mouth basin. Based on previous studies, this paper uses three-dimensional high-resolution seismic data, combined with the application of coherent attribute analysis technology to refine the interpretation of regional faults. The faults are classified into the first-level basin-controlling faults, the second-level sag-controlling faults, the third-level belt-controlling faults, and the fourth-level ring-controlling faults in the area based on the level and scale of the faults. Single-section fault styles such as normal faults, form step-shaped, "Y"-shaped and other fault combinations on the seismic section. Among them, negative flower-like structures present in the Wenchang A sag in the Zhusan sag and unique core-shaped faults are widely distributed in the Kaiping depression of the Zhuer sag. During the Late Oligocene-Early Miocene, the fault direction rotated clockwise from NE→EW→NWW under the continuous right-handed stress field since the Cenozoic, and the activity intensity gradually weakened. It is also believed that affected by the collision of the India-Eurasia Plate, the subduction and retreat of the Pacific Plate and the continuous southward movement of the Paleo-South China Sea, the basin formed a typical extensional tensile stress field environment, which contributed to the development of three fault groups in NE-NEE and EW direction during the Eocene-Oligocene, and in the NWW-NW direction in Miocene. Moreover, the evolution and genetic mechanism of the fault structure in the southwestern part of the Pearl River Mouth basin are in good agreement with the changes in the stress field at the northern margin of the South China Sea.
- southwest section of Pearl River Mouth basin,
- fracture trend,
- fault activity rate,
- stress field environment,
- marine geology

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References(66)

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Characteristics and Genesis of Faults in Southwestern Pearl River Mouth Basin, Northern South China Sea

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