末次盛冰期以来南海南部天然气水合物储库变化及其对环境的影响  

Change of gas hydrate reservoirs in the southern South China Sea from the Last Glacial Maximum to present and its effect on the environment

作　　者：王淑红[1] 颜文[1] 宋海斌[2] 樊栓狮[3] 

机构地区：[1]中国科学院南海海洋研究所 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国科学院广州天然气水合物研究中心,广州510640

出　　处：《地球物理学报》2005年第5期1117-1124,共8页Chinese Journal of Geophysics

基　　金：中国科学院南海海洋研究所创新领域前沿项目(lyqy200312);中国科学院知识创新工程重要方向项目(KZCX3SW224;KGCX2SW309);国家863计划青年基金(2004AA616090)联合资助.

摘　　要：末次盛冰期以来南海南部海平面及海洋底水温度均发生了很大的变化.为了研究南海南部天然气水合物稳定带厚度在这个过程中的变化情况及其对环境的影响,我们利用相关的计算公式,并编制了计算稳定带厚度的程序,在南海南部的南沙海槽、曾母盆地、巴拉望盆地和苏禄海等四个重点海域选取了35个点进行末次盛冰期及目前稳定带厚度的计算.计算结果表明,南海南部末次盛冰期和目前的天然气水合物稳定带厚度分别为262m和233m;甲烷资源量分别为2.69×1013m3和2.39×1013m3;水合物资源量分别为1.64×1011m3和1.46×1011m3.这说明自末次盛冰期以来,南海南部稳定带厚度平均减薄了29m,平均减薄百分比为12%,同时释放了大约3.0×1012m3的甲烷,这些甲烷对环境产生了较大影响,对末次冰期的结束起了较大作用.There has been a big change of the sea level and seabed water temperature since the Last Glacial Maximum （LGM） in southern South China Sea. In order to study the change of the thickness of gas hydrate stable zone and its effect on environment, 35 spots from four key areas in the southern South China Sea were selected to calculate it based on relative equation and program. The results show that the thickness of the gas hydrate stable zone are 262m and 233m, the methane resource quantity are 2.69 × 10^13m^3 and 2.39 × 10^13m^3 , and the gas hydrate resource quantity are 1.64 ×10^11 m^3 and 1.46 × 10^11 m^3 in LGM and at present, respectively, indicating the thickness of the stable zone has reduced by 29m, i.e. 12 percent on average and 3.0 × 10^12 m^3 methane was released since LGM. This released methane should have greatly affected the environment and even terminated the ice age.

关 键 词：末次盛冰期 南海南部 天然气水合物 储库 环境 

分 类 号：P584[天文地球—岩石学] P313[天文地球—地质学]