Fig. 10
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Binary diagrams using compositional and isotopic data from the wells PTRA-1, PTRA-2, PTRA-5, and PTRA-14. (a) carbon isotopic patterns of HC gas compounds C1 to C4, the two horizontal dashed lines correspond to asymptotic δ13C values around -15 and -40 per mil; (b) Correlation between the carbon isotopic ratio of ethane and the H2 concentrations.
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