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《Geology in China》 2006-06
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Origin and distribution of mud diapirs in the Yinggehai basin and their relation to the migration and accumulation of natural gas

HE Jia-xiong~1, XIA Bin~1, ZHANG Shu-lin~2, YAN Pin~1, LIU Hai-ling~1(1. Key Laboratory of Marginal Sea Geology and Resources, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China2. CNOOC Research Center, Beijing 100027, China)  
Mud diapirs are characteristic anomalous seismic-geologic bodies in the Yinggehai basin on the northern margin of the South China Sea and have the less compact,abnormally high-pressure and -temperature and low-density and -velocity geophysical characteristics.They show pronounced zoning and are distributed en echelon in a nearly N-S direction along the northwest trend of the basin.The origin and distribution of the mud diapirs were controlled mainly by the combined action of the great abnormally high-temperature and -pressure potential energy produced by rapid subsidence of the basin and inequilibrium between the filling-compaction of rapidly deposited sediments and fluids squeezed out and the dextral strike-slip extension of regional basin-controlling faults in the late stage.The natural gas and CO_2 migration and accumulation were effectively controlled by the effective combination of the upward intrusion of the late-stage mud-diapir thermal fluids and their accumulation conditions.
【Fund】: 中国科学院边缘海地质重点实验室创新项目(MSGL06-19);; 中国科学院三期知识创新项目(KZCXZ-YW-203)资助
【CateGory Index】: P618.130.1
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