高温裂解气的生成造成甲烷碳同位素变重的假象。
Cracked gas in high-temperature causes methane carbon isotope to heavy.
不同的烃类运移方式产生了不同的甲烷碳同位素分馏效应。
Various patterns of hydrocarbon migration would result in different fractionation effects of methane carbon isotopes.
该区的煤成气以甲烷碳同位素偏轻、重烃气体碳同位素偏重为特征；
The gases are characterized by rich light carbon isotope in methane and rich heavy carbon isotope in heavy hydrocarbons (C_2, -C_4).
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