Test of natural hydrate free-gas measuring technique in permafrost region of Qilian Mountain
ZHOU Ya-Long1, 2, 3, ZHANG Fu-Gui1, 2, 3, YANG Zhi-Bin1, 2, 3, TANG Rui-Ling1, 2, 3, SUN Zhong-Jun1, 2, 3, ZHANG Shun-Yao1, 2, 3, WANG Hui-Yan1, 2, 3
1.State Research Center of Modern Geological Exploration Engineering Technology,Langfang 065000,China; 2.Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China; 3.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China
Abstract：The field measuring test of free-gas methane was carried out in Muli known hydrate region of Qinghai through west portable soil flux measuring instrument and G2132-iAnalyzer Methane-carbon isotope analyzer. The spatial distribution of free-gas methane characteristic values and geochemical anomaly reveals that there exist good free-gas methane geochemical anomalies above the hydrate deposit, while the spatial distribution of the anomalies is controlled by ore-controlling fractures and underground mineral resources, showing corresponding relation. The research on organic geochemistry and carbon isotope indicates that the gas hydrates in Qilian permafrost region is of thermal origin. The free-gas methane field analysis shows that the free-gas methane geochemical anomaly is mainly of thermal and microorganism origin, and the free-gas methane experiment in winter can reduce the interference of the surface microbial action. The study results indicates that the free-gas methane field measuring technique is applicable to the natural gas hydrate exploration, which can not only indicate the hydrate deposits but also serve as the mutual supplement to other hydrates geochemical exploration techniques, with the best sampling time being winter.
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