Print this page
Figure 8. Methane d13C versus ethane d13C for coalbed gases in Canada, Poland, and the United States. Sources of data are listed in Table 1. Compositional trend for gases generated from oil-prone source rocks with maturation is estimated from James (1983), Sundberg and Bennett (1983), Jenden et al. (1988), and Jenden and Kaplan (1989).