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《Acta Petrolei Sinica》 2008-03
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Geological structures for forming gas hydrate reservoir in the huge deepwater gas field of the northern South China Sea

WU Shiguo1,2 YAO Genshun2,3 DONG Dongdong2,4 ZHANG Guangxue5 WANG Xiujuan2(1.College of Geo-Resource and Information,China University of Petroleum,Qingdao 266555,China;2.Key Laboratory for Marine Geology and Environment of the Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;3.Hangzhou Institute of Petroleum Geology,PetroChina Exploration and Development Research Institute,Hangzhou 310023,China;4.Graduate School,Chinese Academy of Sciences,Beijing 100049,China;5.Guangzhou Marine Geology Survey Bureau,China Geological Survey,Guangzhou 510760,China)  
The plate activity is weaker in the passive continental margin of the northern South China Sea,which is favorable for forming the large-scale gas field and gas hydrate reservoirs.The study on gas hydrate enrichment in the passive continental margin showed the importance of thermogenic gas for forming gas hydrate.The active faults,diapire structure,slump deposits,faults break and coarse submarine fan in the slope controlled the concentration of gas hydrate.The study case of the northern South China Sea showed that fault break was an important migration system and favorable for gas to transport into the stable zone of gas hydrate and also controlled the profitable sedimentary facies zones,such as submarine fan and slump deposits.Episodic activities of fauls could prompt thermogenic gas to leak upwards and form gas hydrate in the stable zone of gas hydrate.In the coexisting zone of gas and gas hydrate,there were two models of gas hydrate reservoir.One model was the tectonic discharge dominated by high-concentration thermogenic gas with a little shallow biogenetic gas,and another was the strata diffusion mainly containing the low-concentration shallow biogenetic gas and a little thermogenic gas.
【Fund】: 中国科学院重要方向性项目(KZCX2-YW-203)“南海深水油气勘探中若干问题”;; 国家高技术研究发展计划(863)项目(2006AA09Z349);; 山东省“泰山学者”建设工程项目联合资助
【CateGory Index】: P618.13
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