青海木里三露天天然气水合物矿藏土壤微量元素地球化学特征  

Geochemical Characteristics of Trace Elements in Soil above Sanlutian Natural Gas Hydrates in the Qilian Mountains

作　　者：孙忠军[1] 杨志斌[1] 卢振权[2] 张富贵[1] 张舜尧[1] 周亚龙[1] 王惠艳[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]中国地质调查局油气资源调查中心,北京100029

出　　处：《现代地质》2015年第5期1164-1172,共9页Geoscience

基　　金：国土资源部公益性行业专项（201111019）; 国土资源部天然气水合物专项（GZHL20110324,GZH201400302）

摘　　要：在祁连山冻土区木里天然气水合物矿区进行了微量元素地球化学勘查有效性试验,试验面积150 km2,采样密度2个点/km2。研究表明,土壤Ba、V、Fe、Ca等元素在水合物矿藏上方呈现顶部异常,而且异常吻合程度较高。微量元素预测天然气水合物具有较高的成功率,调查前钻探的干井（DK-4、DK-5和DK-6）位于背景区,调查前钻探的水合物井（DK-1、DK-2、DK-3、DK-7）和调查后水合物井（DK3-11、DK2-13、DK1-14）位于异常内。试验结果还预测了祁连山天然气水合物两个新的远景区。试验表明,微量元素是祁连山冻土区寻找天然气水合物的有效指示元素,它们与水合物其它化探指标结合冻土条件和地质特征综合解释,可以提高冻土区天然气水合物预测成功率。The efficiency test of trace element geochemical exploration was carried out for natural gas hydrates in the Qilian Mountains permafrost region, the study area covered 150 km2 and sampling density of 2 sampling sites per kin： was used. Results showed that Ba, V, Fe and Ca in soils presented the apical pattern, and had identical anomalies. Natural gas hydrates could be higher successfully prospected by trace elements. The dry wells （ DK-4, DK-5, DK-6）drilled before this survey were located in background area, and the hydrate wells DK-1, DK-2, DK-3, DK-7 drilled before the survey and DK3-11, DK2-13, DKI-14 drilled after the survey were both located in anomaly area. Two prospective target regions were predicted according to the test results. Test has shown that trace elements were the effective index for prospecting gas hydrate in the Qilan Mountain permafrost region. Combined with permafrost conditions and geological characteristics, the comprehensive inter- pretation of trace elements and other geochemical index gas hydrate in permafrost area. could improve the success rate of prediction for natural

关 键 词：祁连山冻土区 天然气水合物 微量元素 顶部模式 地气迁移机理 

分 类 号：P744.4[天文地球—海洋科学] P632