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Geochemical studies of shale gas and conventional reservoirs within the Triassic Yanchang Formation of Xiasiwan and Yongning Field, Ordos Basin show that methane is isotopically depleted in 13 C as compared to δ 13 C 1 calculated by the Ro based on the relationship between δ 13 C 1 and Ro. Geochemical fractionation during the adsorption/desorption process of...
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