基于重力数据的渤海湾盆地断裂‒莫霍面特征分析与富烃凹陷预测

相鹏; 陈学国; 孟令玮; 吴微; 郭涛; 冯国志; 刘海涛; 李竹强

doi:10.3799/dqkx.2026.122

Volume 51 Issue 5

May 2026

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Xiang Peng, Chen Xueguo, Meng Lingwei, Wu Wei, Guo Tao, Feng Guozhi, Liu Haitao, Li Zhuqiang, 2026. Analysis of Fault-Moho Characteristics and Prediction of Hydrocarbon-Rich Sags in Bohai Bay Basin Based on Gravity Data. Earth Science, 51(5): 1667-1684. doi: 10.3799/dqkx.2026.122

Citation:

Xiang Peng, Chen Xueguo, Meng Lingwei, Wu Wei, Guo Tao, Feng Guozhi, Liu Haitao, Li Zhuqiang, 2026. Analysis of Fault-Moho Characteristics and Prediction of Hydrocarbon-Rich Sags in Bohai Bay Basin Based on Gravity Data. Earth Science, 51(5): 1667-1684. doi: 10.3799/dqkx.2026.122

Citation:

Xiang Peng, Chen Xueguo, Meng Lingwei, Wu Wei, Guo Tao, Feng Guozhi, Liu Haitao, Li Zhuqiang, 2026. Analysis of Fault-Moho Characteristics and Prediction of Hydrocarbon-Rich Sags in Bohai Bay Basin Based on Gravity Data. Earth Science, 51(5): 1667-1684. doi: 10.3799/dqkx.2026.122

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Analysis of Fault-Moho Characteristics and Prediction of Hydrocarbon-Rich Sags in Bohai Bay Basin Based on Gravity Data

doi: 10.3799/dqkx.2026.122

1.
Exploration and Development Research Institute of Shengli Oilfield Branch, SINOPEC, Dongying 257015, China
2.
Institute of Geology, Research Institute of Science and Technology, CNPC, Beijing 100000, China

Received Date: 2026-01-07
Publish Date: 2026-05-25

Abstract

Abstract

As a Cenozoic intracontinental rift basin superimposed on the Paleozoic North China Craton depression, the Bohai Bay basin is located at the junction center of three major tectonic domains, where its hydrocarbon potential is closely related to the crustal structure. Based on the gravity data of the Bohai Bay basin, this study systematically analyzes the fault system of basin, basement characteristics, and Moho discontinuity distribution, and quantitatively evaluates the oil and gas enrichment potential of 59 sags using Principal Component Analysis (PCA). The results show that the faults of basin are characterized by multi-directional development, hierarchical control, and deep-shallow coupling, with their formation synergistically driven by the dual dynamic sources of "mantle thermal extension and plate boundary strike-slip movement". The Moho discontinuity exhibits a significant mirror response relationship with the basement: the average depth of the Moho in the marine area (33.5 km) is significantly shallower than that in the continental area (42.1 km), and the crystalline crust thickness shows a spatial differentiation feature of "thicker in the continental area (36.7 km) and thinner in the marine area (25.3 km)". As the core area of mantle uplift and crustal stretching-thinning in the basin, the Bozhong sag achieved a comprehensive score of 1.00 for oil and gas enrichment potential, ranking first among all sags. According to the comprehensive enrichment score, the 59 sags were classified into four types of exploration targets. Among them, Type Ⅰ-Ⅲ sags (including 27 sags such as Bozhong, Dongying, Raoyang, and Huimin) are favorable for oil and gas exploration, while Type Ⅳ sags (32 sags) have low exploration value due to weak deep tectonic activity and limited reservoir-forming conditions. The findings of this study not only reveal the correlation mechanism between deep crustal structure and oil-gas enrichment in the Bohai Bay basin but also provide important deep geological basis and technical support for the precise exploration of oil and gas resources in this basin and similar intracontinental rift basins worldwide.
- Bohai Bay basin,
- fault,
- Moho characteristics,
- crustal characteristics,
- hydrocarbon-rich sag,
- tectonics,
- petroleum geology

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References(65)

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Analysis of Fault-Moho Characteristics and Prediction of Hydrocarbon-Rich Sags in Bohai Bay Basin Based on Gravity Data

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