东海陆架盆地西湖凹陷超压成因机制

段谟东; 叶加仁; 吴景富; 单超; 雷闯

doi:10.3799/dqkx.2017.009

Volume 42 Issue 1

Jan. 2017

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Duan Modong, Ye Jiaren, Wu Jingfu, Shan Chao, Lei Chuang, 2017. Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin. Earth Science, 42(1): 119-129. doi: 10.3799/dqkx.2017.009

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Duan Modong, Ye Jiaren, Wu Jingfu, Shan Chao, Lei Chuang, 2017. Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin. Earth Science, 42(1): 119-129. doi: 10.3799/dqkx.2017.009

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Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin

doi: 10.3799/dqkx.2017.009

Duan Modong^1
,,
Ye Jiaren^{2
,
,},
Wu Jingfu³,
Shan Chao⁴,
Lei Chuang⁵

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Research Institute of CNOOC, Beijing 100027, China
4.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
5.
Jidong Oilfield Company, PetroChina, Tangshan 063004, China

Received Date: 2016-06-06
Publish Date: 2017-01-15

Abstract

Abstract

Overpressure is widely developed in Xihu depression, which has complicated formation mechanism. However, there is no in-depth study on this topic at present. In this paper, starting from the main factors that produce overpressure, we use both the micro analysis and macro evidence to comprehensively analyze the mudstone overpressure formation mechanism in the Xihu depression of the East China sea shelf basin, based on the logging response characteristics of overpressure formation, as well as the relationship between speed and vertical effective stress, the relationship between the evolution history of deposition and porosity, the coupling of pressure evolution history and that of hydrocarbon-generated rate. It is concluded that overpressure formation in Baochu slope belt is mainly attributed to under-compaction, and its hydrocarbon generation contribution rate is estimated at 23%-57% with an average of 41%. In the central anticlinal belt, overpressure formation mainly has the following two models: one is the model of hydrocarbon generation with a contribution rate of 51%-78%, and the other is the model of under-compaction interaction. Both the hydrocarbon generation and under-compaction have played an important role in the overpressure formation in Santan sag and the average contribution rate of hydrocarbon generation is about 60%.
- formation mechanism,
- mudstone overpressure,
- Xihu depression,
- petroleum geology.

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References(61)

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Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin

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