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- W1975426506 abstract "130 natural gases in the continent of China were determined for the abundance and carbon isotopes of hydrocarbons and carbon dioxide. The δ 13C (PDB) values of methane range from −68 to − 24.4%, and the largest isotopic variability for hydrocarbons is of δ 13C1 < δ 13C; < δ 13C; < δ 13C4 < δ 13C5. These characteristics suggest that the gaseous hydrocarbons originated principally from thermal and or microbial decomposition of organic matter. The wide variations of δ 13C0 distribution patterns (n = 1, 2, 3, 4 and 5) can be explained by (1) extensive mixture between thermogenic and microbial gases, or between thermogenic gases produced during different thermal stage, and or (2) preferential microbial oxidation. There is no direct evidence for the presence of abiogenic hydrocarbon in natural gases in China. One sample from Songliao basin shows a heavier δ 13C1 ( − 24‰) and reverse isotopic distribution pattern (δ 13C1 > δ 13C2 > δ 13C3). Concerning the occurrence of mantle-derived He, Ne, Ar and Xe in the south Songliao basin, we propose that the methane mantle derived and heavy hydrocarbons (ethane, propane, butane, etc.) formed from polymerization of the mantle-derived methane. The δ 13C values for carbon dioxide range from − 13.9 to + 13.5‰ suggesting the multiple origins. Gases with CO2 concentrations greater than 10% have a narrow range of δ 13C values, from − 8 to − 2‰, and show higher 1He 4He ratios ( > 0.1 times the atmospheric value), suggesting that a mantle-derived component is diluted by CO2 derived from carbonate and or organic matter. Positive δ 13C values ( + 4 – + 14‰) indicate CO2 reduction to CH2, CO2 with trace concentration in CH4-rich gases can be attributed to microbial decomposition of organic matter in sedimentary rocks." @default.
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- W1975426506 date "1997-02-01" @default.
- W1975426506 modified "2023-10-17" @default.
- W1975426506 title "Carbon isotopes of hydrocarbons and carbon dioxide in natural gases in China" @default.
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- W1975426506 doi "https://doi.org/10.1016/s0743-9547(96)00082-7" @default.
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