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AAPG Bulletin

Abstract

AAPG Bulletin, V. 107, No. 3 (March 2023), P. 515-536.

Copyright ©2023. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/11222220016

Risk assessment of mantle-derived CO2 in the East China Sea basins, China

Huafeng Tang,1 Xinying Zhao,2 Keqiang Wu,3 Zilin Liu,4 Jianyong Xu,5 Baoliang Lu,6 Ang Sun,7 and Tianchan Guo8

1College of Earth Sciences, Jilin University, Changchun, Jilin, China; [email protected];
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun, Jilin, China; [email protected]
3Shandong Institute of Petroleum and Chemical Technology, Dongying, China; [email protected]
4Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun, Jilin, China; [email protected]
5Exploration Department, CNOOC China Ltd., Beijing, China; [email protected]
6Mineral Resources Evaluation at Yantai Mineral Resources Reserve Center, Yantai, China; [email protected]
7Exploration Department, CNOOC China Ltd., Beijing, China; [email protected]
8School of Geology Engineering and Geomatics, Chang’an University, Xi’an, China; [email protected]
9China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing, China; [email protected]
10College of Earth Sciences, Jilin University, Changchun, Jilin, China; [email protected];
11 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun, Jilin, China; [email protected]

Abstract

Mantle CO2 is widely distributed throughout the basins of the world. Risks are associated with its accumulation that have recently attracted attention in the oil and gas exploration industry. It is, therefore, necessary to determine the mantle CO2 distribution in a target region, which involves determining the locations of the CO2 sources, migration pathways, and areas of accumulation. In this paper, the potential accumulation of mantle CO2 across the East China Sea (ECS) basins is analyzed using the source and migration pathways. The results show that areas of Moho uplift (including paleouplift) correspond to areas of CO2 sources (including paleosources). Steep extensional faults, which penetrate the lower crust and upper mantle, and diapiric structures likely provide for mantle CO2 migration. These results can be used to develop general principles for locating mantle CO2 sources and pathways in rifted basins. Within the ECS basins, the Lishui, Jiaojiang, and Diaobei sags are considered high-risk areas for CO2 accumulation. The Xihu and Fuzhou sags are medium-risk areas, and the remaining sags are low-risk areas. The areas along the Lingfeng, Yandang, Fuzhou, and Xihu-Jilong faults are potential CO2 accumulation areas. This study indicates that the accumulation of mantle CO2 in the ECS basins can be predicted from the Moho depth distribution, fault systems, and traps across the region.

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