Abstract

The natural gases developed in deep volcanic rock reservoirs of the Songliao Basin, NE China are characterized by enriched δ13C value for methane and frequently reversal carbon isotopic distribution pattern. Although many researchers consider such gas type as an abiogenic origin, we believe the natural gases have a biogenic origin mainly except little inorganic gases and the reversal carbon isotopic distribution pattern of gases is caused by mixing of different origin gases.

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