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《Geoscience》 2018-05
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Geochemical Investigation and Prospective Evaluation of Natural Gas Hydrates in the Permafrost of Mohe Basin

ZHANG Fugui;TANG Ruiling;YANG Zhibin;ZHU Jinghua;ZHOU Yalong;SUN Zhongjun;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences;Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Chinese Academy of Geological Sciences;Linyi University;  
The Mohe basin is a major permafrost region in China. Gas hydrate reservoir system is well developed in the basin,and the basin shows good accumulation conditions for gas hydrates. The 1∶ 50 k scale regional gas hydrate geochemical survey was conducted in the Mohe basin to delineate prospecting gas hydrate target areas,and to recognize oil and gas traps and identify the hydrocarbon source. Our results show that:( 1) In the forest bog region,headspace gas and fluorescence spectra are the main indices of gas hydrate exploration. Considering the AMT and geology materials,and the previous gas hydrate geochemical work in the Muli permafrost of Qinghai,we consider the Yuanbao depression as the gas hydrate target.( 2) Methane carbon isotope analysis on core samples shows that the primary hydrocarbon gas is multi-genetic,and only a few adsorbed gases are from bacterial and hydrocarbon pyrolysis.( 3) Multiple classification-GIS technique employed in this study can exclude the interference factors and precisely delineate the boundary of geochemical anomalies,and can thus be applied in the geochemical exploration of gas hydrates.
【Fund】: 中国地质调查局地质调查项目(DD20160224);; 中央级公益性科研院所基本科研业务费专项基金项目(AS2016Y01)
【CateGory Index】: P618.13
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