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《Natural Gas Industry》 2010-10
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Characteristics of gas source in the waters of Shenhu and their significance to gas hydrate accumulation

Su Pibo1,Lei Huaiyan1,2,Liang Jinqiang3,Sha Zhibin3,Fu Shaoying3,Gong Yuehua3(1.College of Oceanography and Environmental Science,Xiamen University,Xiamen,Fujian 361005;China;2.Lanzhou Research Center of Geology and Geophysics Institute,Chinese Academy of Sciences,Lanzhou.Gansu 730000,China;3.Guangzhou Marine Geology Survey,Ministry of Land and Resource,Guangzhou,Guangdong 510760,China)  
In order to recognize gas sources and accumulation patterns of gas hydrate in the waters of Shenhu,we built a geologic model based on the high-resolution seismic profile tied to the SH2 well and simulated the accumulation of gas hydrate.The geologic history and thermal evolution history of the SH2 wellblock were restored,the EASY% Ro model was used to define the thermal evolution history of source rocks in the SH2 well,and the characteristics of gas source were preliminarily discussed in combination with the sampling results in the exploratory area.The following conclusions were obtained.Sources rocks in both the deep Palaeogene Wenchang and Enping formations have high thermal maturity(Ro2%),and are in dry gas generating stage with a huge potential of pyrolysis gas.In contrast,source rocks in the shallow Neogene Zhujiang,Hanjiang,Yuehai and Wanshan formations are basically immature and/or low mature(Ro0.7%),are relatively high in organic abundance,and have a huge potential of biogas.In addition,faults and diapires are highly developed in Shenhu waters.They act as the bridges connecting the shallow gas hydrate stable zones with the gas sources,and are pathways for the migration of the shallow biogas and deep pyrolysis gas.When the temporal and special combination of gas sources and gas hydrate stable zones is favorable,gas hydrate can accumulate in suitable geologic conditions.Preliminary prediction results show that the study area has huge gas hydrate resource potentials,thus it is a prospect for future gas hydrate exploration.
【Fund】: 国家重点基础研究发展计划(973计划)项目“南海北部天然气水合物成藏的气源条件研究”(编号:2009CB219501);; 国土资源部公益性行业科研专项项目“天然气水合物成藏的控制因素研究”(编号:200811014);; 国家自然科学基金项目“南海北部深水盆地油气渗漏系统与天然气水合物富集机制研究”(编号:40930845)
【CateGory Index】: P618.13
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