摘要
对青海木里三露天天然气水合物矿藏进行了地球化学精查,面积10 km2,采样密度为16个点/km2,分析了土壤酸解烃和顶空气。对精查地球化学异常进行了解释,着重于天然气水合物矿藏和天然气藏的区分,以及水合物靶区预测等问题。研究表明,综合地球化学异常和冻土厚度能够有效区分水合物和浅层气,酸解烃和顶空气重烃比值能够圈定天然气水合物靶区。8个天然气水合物发现井（DK-1、DK-2、DK-3、DK-7、DK-9、DK12-13、DK11-14和DK10-17）位于靶区内,全部的水合物干井（DK-4、DK-10、DK10-16、DK10-18、DK7-20、DK-6、DK6-21、DK4-24）位于背景区。
The intensive gas hydrate geochemical exploration has been taken in Sanlutian field, Muli, Qinghai. The work area is 10 square kilometers, and sampling density is 16 points per square kilometer, the soil acid-ex- tracted and headspace gas of each point has been analyzed. The explaining of geochemical anomaly focused on the difference of gas hydrate mine and natural gas mine, and also focused on the gas hydrate target forecast. The result shows that comprehensive geochemical anomaly and the thickness of permafrost can effectively differentiate gas hydrate between shallow gases ; and the ratio of acid-extracted hydrocarbon and headspace gas heavy hydrocarbon can effectively delineate the gas hydrate target area. Eight gas hydrate wells （DK-1, DK-2, DK-3, DK- 7, DK-9, DK12-13, DKll-14, and DK10-17） are in the target area, while all dry wells （DK-4, DK-10, DK10-16, DK10-18, DK7-20, DK-6, DK6-21, and DK4-24） are in background area.
出处
《现代地质》
CAS
CSCD
北大核心
2015年第5期1242-1258,共17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）
关键词
水合物地球化学精查
水合物靶区
多年冻土
三露天
祁连山
intensive gas hydrate geochemical exploration
gas hydrate target
permafrost
Sanlutian Qilian Mountains
