| Gas Sources of Natural Gas Hydrates in the Shenhu Drilling Area, South China Sea: Geochemical Evidence and Geological Analysis |
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| 作者姓名： | ZHU Youhai HUANG Xi FU Shaoying and SU Pibo |
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| 作者单位： | 1 Oil & Gas Survey, China Geological Survey, Beijing 100029
2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037
3 Guangzhou Marine Geological Survey, Guangzhou 510760 |
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| 基金项目： | This work was supported by the National Major Fundamental and Development Project of China (No. 2009CB219501）and the National Natural Science Foundation of China (No. 41202099). |
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| 摘 要： | The Shenhu gas hydrate drilling area is located in the central Baiyun sag, Zhu Ⅱ depression, Pearl River Mouth basin, northern South China Sea. The gas compositions contained in the hydrate-bearing zones is dominated by methane with content up to 99.89% and 99.91%. The carbon isotope of the methane (δ13C1 ) are 56.7‰ and 60.9‰, and its hydrogen isotope (δD) are 199‰ and 180‰, respectively, indicating the methane from the microbial reduction of CO2 . Based on the data of measured seafloor temperature and geothermal gradient, the gas formed hydrate reservoirs are from depths 24-1699 m below the seafloor, and main gas-generation zone is present at the depth interval of 416-1165 m. Gas-bearing zones include the Hanjiang Formation, Yuehai Formation, Wanshan Formation and Quaternary sediments. We infer that the microbial gas migrated laterally or vertically along faults (especially interlayer faults), slump structures, small-scale diapiric structures, regional sand beds and sedimentary boundaries to the hydrate stability zone, and formed natural gas hydrates in the upper Yuehai Formation and lower Wanshan Formation, probably with contribution of a little thermogenic gas from the deep sedments during this process.
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| 关 键 词： | natural gas hydrate methane microbial gas gas source migration South China Sea |
| 收稿时间： | 2013/3/15 0:00:00 |
| 修稿时间： | 5/2/2013 12:00:00 AM |
Gas Sources of Natural Gas Hydrates in the Shenhu Drilling Area, South China Sea: Geochemical Evidence and Geological Analysis |
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| Authors: | ,
ZHU Youhai
,
HUANG Xia
,
FU Shaoying
,
SU Pibo |
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| Institution: | 1. Oil & Gas Survey, China Geological Survey, Beijing 100029 ;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037
2. Guangzhou Marine Geological Survey,Guangzhou,510760 |
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| Abstract: | The Shenhu gas hydrate drilling area is located in the central Baiyun sag, Zhu II depression, Pearl River Mouth basin, northern South China Sea. The gas compositions contained in the hydrate‐bearing zones is dominated by methane with content up to 99.89% and 99.91%. The carbon isotope of the methane (δ13C1) are ?56.7‰ and ?60.9‰, and its hydrogen isotope (δD) are ?199‰ and ?180‰, respectively, indicating the methane from the microbial reduction of CO2. Based on the data of measured seafloor temperature and geothermal gradient, the gas formed hydrate reservoirs are from depths 24–1699 m below the seafloor, and main gas‐generation zone is present at the depth interval of 416–1165 m. Gas‐bearing zones include the Hanjiang Formation, Yuehai Formation, Wanshan Formation and Quaternary sediments. We infer that the microbial gas migrated laterally or vertically along faults (especially interlayer faults), slump structures, small‐scale diapiric structures, regional sand beds and sedimentary boundaries to the hydrate stability zone, and formed natural gas hydrates in the upper Yuehai Formation and lower Wanshan Formation, probably with contribution of a little thermogenic gas from the deep sedments during this process. |
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| Keywords: | natural gas hydrate methane microbial gas gas source migration South China Sea |
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