莺歌海盆地中央底辟带乐东区莺歌海组超压成因及相对贡献定量化评价

张旭友; 范彩伟; 郭小文; 吴云鹏; 刘爱群; 高英博; 黄亚浩

doi:10.3799/dqkx.2022.045

Volume 49 Issue 10

Oct. 2024

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Zhang Xuyou, Fan Caiwei, Guo Xiaowen, Wu Yunpeng, Liu Aiqun, Gao Yingbo, Huang Yahao, 2024. Overpressure Mechanisms and Quantitative Evaluation of Relative Contribution for Yinggehai Formation in Ledong Area of Central Diapir Zone, Yinggehai Basin. Earth Science, 49(10): 3547-3558. doi: 10.3799/dqkx.2022.045

Citation:

Zhang Xuyou, Fan Caiwei, Guo Xiaowen, Wu Yunpeng, Liu Aiqun, Gao Yingbo, Huang Yahao, 2024. Overpressure Mechanisms and Quantitative Evaluation of Relative Contribution for Yinggehai Formation in Ledong Area of Central Diapir Zone, Yinggehai Basin. Earth Science, 49(10): 3547-3558. doi: 10.3799/dqkx.2022.045

Citation:

Zhang Xuyou, Fan Caiwei, Guo Xiaowen, Wu Yunpeng, Liu Aiqun, Gao Yingbo, Huang Yahao, 2024. Overpressure Mechanisms and Quantitative Evaluation of Relative Contribution for Yinggehai Formation in Ledong Area of Central Diapir Zone, Yinggehai Basin. Earth Science, 49(10): 3547-3558. doi: 10.3799/dqkx.2022.045

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Overpressure Mechanisms and Quantitative Evaluation of Relative Contribution for Yinggehai Formation in Ledong Area of Central Diapir Zone, Yinggehai Basin

doi: 10.3799/dqkx.2022.045

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Zhanjiang Branch of CNOOC China Limited, Zhanjiang 524057, China
3.
Hainan Branch of CNOOC China Limited, Haikou 570312, China
4.
College of Resources and Environment, Yangtze University, Wuhan 430100, China

Received Date: 2021-11-16
Available Online: 2024-11-08
Publish Date: 2024-10-25

Abstract

Abstract

Overpressure is widely developed of Yinggehai Formation in Ledong area of the central diapir zone. The overpressure mudstone is characterized by abnormally higher acoustic travel time, lower resistivity and density than that of the normal pressured mudstones.In this paper, the contribution rate of overpressure caused by different mechanisms is quantitatively evaluated based on the comprehensive analysis of the overpressure mechanisms of Yinggehai Formation in the central diapir zone of Yinggehai basin.The results indicate that the main causes of overpressure in Yinggehai Formation in Ledong area of the central diapir zone include undercompaction, hydrocarbon generation of organic matter and overpressure transfer. The contribution of clay mineral transformation to the overpressure is not obvious. The quantitative study of overpressure contribution rate reveals the contribution of fluid pressure transfer and hydrocarbon generation to mudstone overpressure in the diapir area of Yinggehai Basin. The contribution rate of overpressure caused by undercompaction in the Ledong Area of the Central Diapir Zone of Yinggehai Basin ranges from 38% to 100%. As the burial depth increases, the contribution rate of undercompaction-induced overpressure gradually decreases. The main overpressure mechanisms in the first member of Yinggehai Formation is undercompaction with the shallow buried depth and weak hydrocarbon generation capacity. While the hydrocarbon generation capacity of mudstone in the second member of Yinggehai Formation is significantly enhanced, the contribution caused by hydrocarbon generation is up to 51.53%. Microfractures and faults are developed in the diapir area, which make the deep fluid migrate to the shallow layer and produces pressure transfer. The maximum contribution rate of pressure transfer is more than 50% in Yinggehai Formation.
- undercompaction,
- diapir area,
- overpressure mechanism,
- overpressure contribution rate,
- Yinggehai Basin,
- petroleum geology

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References(61)

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Overpressure Mechanisms and Quantitative Evaluation of Relative Contribution for Yinggehai Formation in Ledong Area of Central Diapir Zone, Yinggehai Basin

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