渤海湾盆地辽中凹陷南洼超压发育特征及成因

王冰洁; 王德英; 郭涛; 王鑫; 惠冠洲; 薛明旺

doi:10.3799/dqkx.2021.254

Volume 49 Issue 5

May 2024

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Wang Bingjie, Wang Deying, Guo Tao, Wang Xin, Hui Guanzhou, Xue Mingwang, 2024. Development Characteristics and Origin of Overpressure in South of Liaozhong Depression, Bohai Bay Basin. Earth Science, 49(5): 1832-1843. doi: 10.3799/dqkx.2021.254

Citation:

Wang Bingjie, Wang Deying, Guo Tao, Wang Xin, Hui Guanzhou, Xue Mingwang, 2024. Development Characteristics and Origin of Overpressure in South of Liaozhong Depression, Bohai Bay Basin. Earth Science, 49(5): 1832-1843. doi: 10.3799/dqkx.2021.254

Citation:

Wang Bingjie, Wang Deying, Guo Tao, Wang Xin, Hui Guanzhou, Xue Mingwang, 2024. Development Characteristics and Origin of Overpressure in South of Liaozhong Depression, Bohai Bay Basin. Earth Science, 49(5): 1832-1843. doi: 10.3799/dqkx.2021.254

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Development Characteristics and Origin of Overpressure in South of Liaozhong Depression, Bohai Bay Basin

doi: 10.3799/dqkx.2021.254

CNOOC Tianjin Company, Tianjin 300452, China

Received Date: 2021-12-13
Available Online: 2024-06-04
Publish Date: 2024-05-25

Abstract

Abstract

This paper deals with the origin of overpressure in the Paleogene strata, in south of Liaozhong depression, Bohai Bay Basin, through comprehensive application and analysis of various geological data and research methods, we suggest that hydrocarbon generation is the main mechanism. In some areas (W-D structure), there is overpressure formed by superposition of disequilibrium and hydrocarbon generation. The main evidences are as follows: (1) Except for W-D structure, logging curves generally do not have typical characteristics of high porosity and low density caused by disequilibrium; (2) The top depth of overpressure formed by disequilibrium in sedimentary background is inconsistent with the reality; (3) The overpressure top develops in the internal large mudstone section, with greatly varying depth range (from 2 200-3 100 m), and it is basically the same as hydrocarbon generation top of source rocks; (4) The relationship between formation effective stress with velocity and density shows that the overpressure points all fall on the "unloading" curve, and the overpressure characteristics are hydrocarbon generation; (5) The overpressure source rocks are still in large hydrocarbon generation stage, continue to provide guarantee for overpressure formation; (6) Overpressure formed by superimposition of disequilibrium and hydrocarbon generation is characterized by typical formation high porosity and low density, the relationship curves between effective stress and formation velocity and density formations show obvious unloading phenomena.
- deposition,
- hydrocarbon generation,
- disequilibrium,
- origin of overpressure,
- the south sag of Liaozhong depression,
- Bohai Bay basin,
- petroleum geology

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References(36)

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Development Characteristics and Origin of Overpressure in South of Liaozhong Depression, Bohai Bay Basin

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