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The CO2-rich natural gas from the Huangqiao oil and gas field of the Subei Basin is produced along with crude oil. The CO2 content, ranging from 80.56% to 99.30% and the 3He/4He ratio of 0.94×10−6 to 4.67×10−6, indicates that this includes a substantial fraction of mantle-derived CO2 in the Huangqiao region. Although the positive carbon isotopic series of alkane gases (i.e., δ13C1<δ13C2<δ13C...
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