木里冻土带天然气水合物赋存区浅层土壤地球化学特征及指示意义

doi:10.11743/ogg20140121

Abstract

Abstract: Muli,the only gas hydrate hosting area in China proved by core sampling,is located in Qilian Mountain permafrost area.Petroleum geochemical exploration was carried out with three hydrocarbon detection techniques(HS,acidolysis hydrocarbon and altered carbonate survey methods)in the area.The results show that the former two methods are more effective than the latter one.Analysis of free hydrocarbons extracted through HS and absorbed hydrocarbons from acidolysis indicates that the components of hydrocarbon gas in soil of areas containing gas hydrate in Muli are complex.In addition to the major component of methane,there are also small amount of ethane,propane,butane and pentane.There are both hydrocarbon gas of pyrolytic origin and that of microbiogenic genesis.The hydrocarbon gas can be classified as oil-prone gas,coal-drived gas and biogas.Methane contrast diagram in combination with the geologic background and core samples in wells discovering gas hydrate reveal that its eastern-central part with well-developed faults and high methane anomaly may be a favorable target for gas hydrate exploration.

Key words: permafrost, soil geochemistry, gas hydrate, Muli area in Qinhai province

CLC Number:

TE122.1

Xing Xuewen, Liu Song, Zhou Hongying, Zou Liqun, Li Guangzhi, Gao Wei. Geochemical behaviors of shallow soil in Muli permafrost and their significance as gas hydrate indicators[J]. Oil & Gas Geology, 2014, 35(1): 159-166.

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Geochemical behaviors of shallow soil in Muli permafrost and their significance as gas hydrate indicators

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