Economic and Environmental Geology

Fig. 6.

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Fig. 6. Diagrams showing δ13CC2 versus δ13DCH4 (a) and δ13CCH4 (b) of coalbed gases in AA-1 core samples. The coalbed gases of AA-1 core samples (red solid circles) were plotted to non-marine coal-type gas or a mixture of microbial and coal-type gases in the genetic fields (Liu et al., 2019). Coal-type gases in the Bohai Basin samples (blue solid circles) were distinguished from microbial gases in the Qaidam Basin (green solid circles), China (Liu et al., 2019).
Econ. Environ. Geol. 2022;55:261-71
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