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本文对现代泥炭进行了低温长时间模拟实验研究，并探讨了过渡带气的形成机理。甘南泥炭气、液态烃产率高。液态烃由热解油和残余气仿沥青“Ａ”两部分组成，热解油中以Ｃ５─Ｃ１４较轻馏分为主，残余氯仿沥青“Ａ”则以非烃、沥青质为主。随热演化程度增高，烃类增加，非烃和沥青质急剧减少。模拟气体组成以非烃气体（ＣＯ２等）为主，随温度升高，气态烃产率升高，烃类气体中以甲烷为主。２００℃～４００℃温度下产生的甲烷碳同位素δ１３Ｃ为－５３．８２～－３３．６６‰。研究表明低热演化阶段伴随腐殖物质的降解和干酪根的分子重排作用能产生甲烷同位素较轻的生物－热催化过渡带气。
In this paper, a simulative experimental study of modern peat at low temperature for a long time is carried out and the formation mechanism of transitional gas is discussed. Gannan peat gas, high liquid hydrocarbon yield. Liquid hydrocarbon from the pyrolysis oil and residual gas-like asphalt “A” composed of two parts, the pyrolysis oil to C5 ─ C14 lighter distillate, the residual chloroform bitumen “A” non-hydrocarbon, asphaltene-based. With the degree of thermal evolution increased, hydrocarbons increased, non-hydrocarbon and asphaltene sharply reduced. The composition of the simulated gas is mainly non-hydrocarbon gas (CO2, etc.). With the increase of temperature, the yield of gaseous hydrocarbon is increased, while the methane is the main hydrocarbon gas. The carbon isotope δ13C of methane produced from 200 ℃ to 400 ℃ is -53.82 ~ -33.66 ‰. The study shows that the degradation of humic substances and the molecular rearrangement of kerogen during the low-thermal evolution stage can produce a lighter bio-thermo-catalytic transition gas with methane isotope.