珠江口盆地珠二坳陷中部“对向拆离型复合洼陷”结构特征及其成因探讨

彭光荣; 郑金云; 蔡嵩; 陈兆明; 韩晋阳; 王梓颐

doi:10.3799/dqkx.2023.068

Volume 49 Issue 4

Apr. 2024

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Peng Guangrong, Zheng Jinyun, Cai Song, Chen Zhaoming, Han Jinyang, Wang Ziyi, 2024. Structural Characteristics and Genesis of Opposite Detachment Type Composite Sag in Middle of Zhu Ⅱ Depression, Pearl River Mouth Basin. Earth Science, 49(4): 1385-1399. doi: 10.3799/dqkx.2023.068

Citation:

Peng Guangrong, Zheng Jinyun, Cai Song, Chen Zhaoming, Han Jinyang, Wang Ziyi, 2024. Structural Characteristics and Genesis of Opposite Detachment Type Composite Sag in Middle of Zhu Ⅱ Depression, Pearl River Mouth Basin. Earth Science, 49(4): 1385-1399. doi: 10.3799/dqkx.2023.068

Citation:

Peng Guangrong, Zheng Jinyun, Cai Song, Chen Zhaoming, Han Jinyang, Wang Ziyi, 2024. Structural Characteristics and Genesis of Opposite Detachment Type Composite Sag in Middle of Zhu Ⅱ Depression, Pearl River Mouth Basin. Earth Science, 49(4): 1385-1399. doi: 10.3799/dqkx.2023.068

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Structural Characteristics and Genesis of Opposite Detachment Type Composite Sag in Middle of Zhu Ⅱ Depression, Pearl River Mouth Basin

doi: 10.3799/dqkx.2023.068

Peng Guangrong^{1, 2
,
,},
Zheng Jinyun^{1, 2},
Cai Song^{1, 2},
Chen Zhaoming^{1, 2},
Han Jinyang^{1, 2},
Wang Ziyi^{1, 2}

1.
Shenzhen Branch, CNOOC China Ltd., Shenzhen 518054, China
2.
CNOOC Deepwater Development Ltd., Shenzhen 518054, China

Received Date: 2023-01-09
Available Online: 2024-04-30
Publish Date: 2024-04-25

Abstract

Abstract

In deep water area of the northern continental margin of the South China Sea, unidirectional detachment faults were mostly developed in the Eocene, and the middle part of the Zhu Ⅱ depression was located in the intersection area of the south dip single detachment fault and the north dip multistage detachment fault system in the junction zone of Zhu-2 and Zhu-1 and Zhu-3 depressions of the Pearl River Mouth basin, forming a unique "opposite detachment type composite sag". However, its structural characteristics and cause of formation need to be further studied. Based on the latest high-precision 3D seismic data and the complete Eocene drilling data, the tectonic geomorphology of the T80/T83 depression in the key geological period of Eocene is restored to be a narrow and deep separated type to a wide and shallow converging type. The depositional center migrated from the near source steep slope to the central zone on both sides, and the uplift fault block in the intersection area of the opposite faults distributed along the east-west long axis. The tectonic evolution sequence reveals that the opposite detachment fault system started in the key tectonic transformation period of Eocene (T83-43 Ma). In response to the change of the subduction direction of the remote Pacific plate, the crust in the region was detached and thinned under the action of extensional stress. The fault block tilting and differential uplift occurred on the detachment section, and thus became a dynamic source region receiving denuding. At the same time, strong magmatic activity was generated. The dustpan-like fault depression with opposite distribution was reconstructed and the long-axis dynamic supply model in the opposite detachment area was formed. The determination of the spatio-temporal configuration of the long-axis dynamic source area and depositional center of the opposite detachment type composite depression is helpful to serve the prediction of high-quality hydrocarbon reservoir assemblage during the Eocene rift in the deepwater area.
- Pearl River Mouth basin,
- middle of Zhu Ⅱ depression,
- Eocene,
- opposite detachment type composite sag,
- structural characteristics,
- mechanism discussion,
- petroleum geology

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References(75)

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