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澳大利亚悉尼盆地和鲍恩(Bowen)盆地二叠系沥青质煤的煤层气具有以下特征:(1)甲烷/乙烷比值大于或等于 1000;(2)甲烷的δ~(13)C和δD值分别为(-60±10)‰ PDB和-(21±17)‰SMOW;(3)二氧化碳含量小于 5%;(4)δ~(13)C(CO_2-CH_4)值为(55±10)‰ PDB。这些数据表明,决定气体成分的主要作用是微生物还原 CO_2,而不是传统的热成因作用。根据气体的同位素组成(-(7±2)‰ PDB)很容易识别由外部深层侵入的 CO_2。
The CBM of Permian asphaltene coal in the Sydney and Bowen basins of Australia has the following characteristics: (1) methane / ethane ratio greater than or equal to 1000; (2) δ 13 C and δ D values of methane (-60 ± 10) ‰ PDB and - (21 ± 17) ‰ SMOW, respectively; (3) the content of carbon dioxide is less than 5%; (4) the δ 13 C (CO 2 -CH 4) ‰ PDB. These data indicate that the primary role of the composition of the gas is to reduce the CO 2 rather than the traditional thermogenesis. According to the isotopic composition of gas (- (7 ± 2) ‰ PDB), it is easy to identify the CO 2 invaded by deep external layers.