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在以前的研究中柴达木盆地三湖地区生物气一直被认为是完全由第四系腐殖型有机质所生成的。笔者在分析了相关问题后认为第四系的生物气应该是新近系狮子沟组生物气与第四系生物气混合而成,并提出五点证据:①TOC值表明第四系相应层位的产气能力是较低的,不足以生成那么多的生物气;②生物气组分特征表明有热成因气混入;③乙烷等重烃气碳同位素特征表明工区有腐泥型生物气混入;④实验表明煤型气与油型气混合后碳同位素值偏重于油型气;⑤伊克雅乌汝构造狮子沟组发育偏腐泥型有机质。
In previous studies, biogas in the Sanhu area of the Qaidam basin has been considered to be completely formed by Quaternary humus-type organic matter. After analyzing the related issues, the author thinks that the Quaternary biogas should be a mixture of the recent Shizigou biogas and Quaternary biogas and put forward five evidences: (1) The TOC value indicates that the corresponding Quaternary sediments Gas capacity is low, not enough to generate so much biogas; (2) biogas component characteristics indicate that there is thermal genetic gas mixed in; (3) carbon isotope characteristics of heavy hydrocarbon such as ethane show sap-type biogas mixed in the work area; (4) Experiments show that coal-based gas and oil-gas mixed carbon isotope values tend to be more emphasis on oil-type gas; ⑤ Yikegouwu structure Shizigou formation partial sapropelic organic matter.