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The main purpose of this study is to model the δ 13 C values of methane derived from coal by combining kinetic-simulating experiment with the gas chromatography–isotope ratio mass spectrum (GC-IRMS) analysis. The stable carbon isotopic variation of methane in pyrolysates with heating temperature indicates that the assumptions for both a constant kinetic isotope effect (α) and a uniform initial...
Triterpanes and steranes in condensates from the YA13-1 gas field, Qiongdongnan Basin, were monitored. The YA13-1 condensates have unusual biomarker distributions dominated by terpanes and steranes derived from higher plants. Anomalously abundant 18α-oleanane and remarkably abundant bicadinanes are present in the YA13-1 condensates, whereas the 17α-hopane contents are extremely low. Taraxastane and...
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