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高盐沉积物生物气形成过程中，随着产气时间的增长和温度的升高，生成的ＣＨ４有着逐渐富集１２Ｃ的规律，有别于有机质热分解成气过程，热解成气是随时延长、温度升高而降解增强，形成的ＣＨ４则是逐渐富集１３Ｃ。海洋沉积物生成的ＣＨ４较盐湖沉积物生成的ＣＨ４略富１２Ｃ。
During the formation of biogas in high-salinity sediments, the formation of CH4 has a gradual enrichment of 12C with the increase of gas production time and temperature. Unlike pyrolysis of organic matter into gas, pyrolysis gas is readily available Extended, elevated temperature and enhanced degradation, the formation of CH4 is gradually enriched 13C. CH4 produced by marine sediments is 12C more abundant than CH4 produced by salt lake sediments.