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澳大利亚Sydney和Bowen盆地二叠系烟煤中的煤层气具有如下特征:①甲烷/乙烷≥1000;②甲烷的δ~(13)C值(PDB,下同)和δD值(SMOW,下同)分别为-(60±10)‰和-(217±17)‰;③二氧化碳的含量小于5％;④二氧化碳和甲烷的δ~(13)C差值为(55±10)‰。以上特征表明气体的组成主要受微生物的CO_2还原作用影响,而不受传统认为的热反应所控制。侵入到深部的外源成因的CO_2可通过其同位素组成δ~(13)C_(CO_2)=-(7±2)‰加以判识。
CBM in Permian bituminous coal in Sydney and Bowen Basin, Australia has the following characteristics: ① methane / ethane ≥1000; ② δ 13 C value (PDB, the same below) and δD value (SMOW) (60 ± 10) ‰ and - (217 ± 17) ‰, respectively; ③ the content of carbon dioxide is less than 5%; ④ the difference of δ ~ (13) C between carbon dioxide and methane is (55 ± 10) ‰. The above characteristics indicate that the composition of the gas is mainly affected by the CO 2 reduction of microorganisms and is not controlled by the traditional thermal reaction. The CO 2, which is the exogenous gene intruded into the deep, can be identified by its isotopic composition δ ~ (13) C_ (CO_2) = - (7 ± 2) ‰.