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Gas migration and accumulation and the exploration of the middle-deep layers in Yinggehai Basin, Offshore South China Sea

HE Jia-xiong, XIA Bin, LIU Bao-ming , LIUQuan-wen , ZHANG Shu-lin ( Laboratory of Marginal Sea Geology and Resources , CAS, Guangdong 510640, China; The Nanhai West Research Institute , China Offshore Oil Ltd. Co. , Guangdong 524057, China; Southwest Petroleum Institute, Sichuan 610500, China)  
The middle-deep beds are very important new hydrocarbon exploration area in the Yinggehai Basin where there are some mud diapir belts with abnormal high temperature and pressure. The migration and generation of hydrocarbon and hydrocarbon trapped system with the abnormal temperature and pressure in the middle-deep beds are comprehensively studied based on the data of the geophysical explanation and well logging in two new exploration wells (Well X and Well Q). There is a relative good mud cover system with high broken pressure and a good reservoir combination. The geochemistry analysis suggests that the source rocks in the middle-deep beds are good at generating hydrocarbon, which shows a potential for oil and gas exploration in the basin.
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