根据碳同位素组成和稀有气体同位素组成分析，认为研究区不存在纯的幔源气。
As the gases from different origins were interacted and mixed for along time, their composition, isotope constitution were complicated.
少部分来自于煤系地层的无机成因气和深层的无机成因气或者叫幔源气，无机组分在21。
A little part is from coal-measures abiogenic gas and from internal abiogenic gas or is known as mantle-derived gas, inorganic matter accounts for21.
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