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《Natural Gas Geoscience》 2010-03
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Different Factors on the Thickness of Gas Hydrate Stability Zone

XU Wei1,2,QIU Nan-sheng1,2,SUN Chang-yu3,CHEN Guang-jin3(1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;2.Research Center for Basin and Reservoir,China University of Petroleum,Beijing 102249,China;3.Faculty of Chemical Science and Engineering,China University of Petroleum,Beijing 102249,China)  
Gas hydrate has important research significances in future energy,natural environment and disaster.The thickness of gas hydrate stability zone(GHSZ) shows the possible range of hydrate development and distribution.It is greatly related with geothermal gradient,sea bottom temperature and water depth.Based on hydrate phase equilibrium formula of Dickens and Quinby,we quantitatively calculated the thickness of GHSZ in different conditions of geothermal gradient,water depth and sea bottom temperature.When the two parameters in three parameters are assumed unchanged,the thickness of GHSZ decreases with the increase of geothermal gradient regularly,the thickness of GHSZ increase with water depth,and the thickness of GHSZ decrease with increasing of sea bottom temperature as a good liner relationship.If the temperature of the sea bottom is a constant,the thickness of GHSZ will increase gradually from the regions with the larger geothermal gradient and shallower water depth to the smaller geothermal gradient and deeper water depth.If the water depth is unchanged,the thickness of GHSZ will increase gradually from the region with the larger geothermal gradient and higher sea bottom temperature to the smaller geothermal gradient and lower temperature.In addition,we also discussed the differences among the three hydrate phase equilibrium formulas for calculating the thickness of GHSZ.The maximize result of GHSZ thickness was gotten by Dickens-Quinby′s phase equilibrium formula gets,and the smaller values was done by the two others.
【Fund】: 国家自然科学基金重点项目(编号:U0633003);; “863”项目(编号:2006AA09A208)联合资助
【CateGory Index】: P744.4
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