Economic and Environmental Geology

Fig. 7.

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Fig. 7. Diagram showing a combination of δ13CCO2 and δ13CCH4 to analyze carbon isotope separation factor (Ɛc) of coalbed gases in core AA-1 samples. The coalbed gases of core AA-1 samples (red solid circles) were mainly plotted at methyl-type fermentation and mixed CCO2 reduction in the genetic fields (Moore et al., 2014). The secondary microbial methane (SM; blue dot line) was clarified in different methanogenic pathways with primary microbial methane in coalbed gases from the Ordos Basin, China (open circles, Zhang et al., 2019) and Powder River Basin, USA (open triangles, Flores et al., 2008).
Econ. Environ. Geol. 2022;55:261-71 https://doi.org/10.9719/EEG.2022.55.3.261
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