CH 4 is the main component of the escaping gas discharged from the anomalous site in Longqingxia reservoir, Yanqing County. It is mainly originated from biogenic reaction but not an earthquake precursor anomaly.
延庆龙庆峡水库翻花冒气异常释放的主要气体CH4来源于生物成因,而非地震前兆异常。
C-isotopes in CH_4 is fairly light with a δ~ ( 13) C_1 of-52.01%, such gas lies within the range of a mixture of biogenic gas and pyrolytic gas.
天然气中甲烷碳同位素组成较轻,δ~(13)C1值为-52.03‰,分布在生物气与热解气的混合区内。
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