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本文采用数值模拟的方法对天然气中甲烷及其同系物的δ１３Ｃ排序特征进行了研究，结果表明：两种具正序分布特征的生物成因天然气混合后可产生具反序分布特征的天然气。相应地，两种具反序分布特征的非生物成因天然气混合后也可产生具正序分布特征的天然气。对于前者而言，作为混合的两个端元天然气，它们必须具有不同的成因或来源，或它们是明显不同的演化阶段的产物。关于松辽盆地昌德气藏若干口天然气井甲、乙、丙、丁烷碳同位素排序特征的讨论表明，用两种生物成因天然气混合的观点很难解释这种反序排列。
In this paper, the δ13C ordering features of methane and its homologues in natural gas are studied by numerical simulation. The results show that the two natural gas with positive sequence distribution can produce natural gas with reverse distribution. Correspondingly, natural gas with positive sequence distribution can also be produced by mixing two non-biogenic natural gas with reverse distribution. For the former, as a mixed two-terminal natural gas, they must have different causations or sources, or they are products of significantly different evolutionary stages. A discussion of the carbon isotopic ordering characteristics of A, B, C and B in the Changde gas pool in the Songliao Basin shows that it is difficult to explain this reverse order from the viewpoint of mixing two biogenic gas sources.