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《Chinese Journal of Geophysics》 2008-01
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Semi-quantitative analysis of factors affecting gas hydrateformation conditions and its fractions

LU Zhen-Quan~ 1,2 , SULTAN Nabil~2,JIN Chun-Shuang~3, WANG Ming-Jun~1, ZHU You-Hai~1, WU Bi-Hao~11 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China2 Département de Géosciences Marines, IFREMER, Centre de Brest, 29280 Plouzané, France3 Strategic Research Center for Oil and Gas Resources, Ministry of Land and Resources, Beijing 100034, China  
Gas hydrate formation conditions and its fraction out of pore space are two important issues. Based on theoretical gas hydrate thermo-dynamic model, semi-quantitative analyses on various intrinsic factors (such as temperature, pressure, gas composition, pore-water salinity, sediment pore size) affecting gas hydrate formation conditions and its fraction out of pore space are conducted. The analytical results indicate that gas composition (e.g., the mixture of methane and propane) plays a significant role in affecting gas hydrate formation conditions of temperature and pressure; pore-water salinity also greatly affects gas hydrate formation conditions; sediment pore size within a small range (1×10~ -6 ~4×10~ -8 m) have a small effect on gas hydrate formation conditions. Gas hydrate fraction out of pore space is little affected by pore size and pore-water salinity, but is strongly dependent on gas supply.
【Fund】: 中央公益性科研院所基本科研业务费专项基金项目“青藏高原多年冻土区天然气水合物形成条件模拟及预测”;; 中国地质调查局地质大调查项目“我国陆域永久冻土带天然气水合物资源远景调查”;; 中国地质科学院矿产资源研究所预调查项目“青藏高原铁路沿线多年冻土区天然气水合物先期调查研究”资助
【CateGory Index】: P618.13
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