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本文较详细地探讨了成熟阶段腐殖煤在加水热模拟过程中气态产物的演化特征。成熟阶段的煤仍具有相当的生烃潜力，其主要生烃阶段仍以生油为主，生气相对较少。生油高峰之后由于液态产物的大量热裂解才开始进入气态烃的大量生成阶段。由于地质条件下煤中的可溶有机质十分丰富，在高演化阶段由可溶有机质进一步裂解是煤成气的重要来源。非烃主要形成于早期阶段。成熟煤生成的气态烃中甲烷为之主要成分，非烃中Ｈ２为主，其次为ＣＯ２，甲烷的碳同位素值明显低于乙烷，而乙烷和丙烷的碳同位素值差别较小，并且随演化程度的增加各气态组分的碳同位素值差别愈来愈小。
In this paper, the evolution characteristics of gaseous products during the hydrous heat simulation of mature stage humic coal are discussed in more detail. Mature stage coal still has considerable potential for hydrocarbon generation, and its main hydrocarbon generation stage is still dominated by oil generation with relatively few anger. After the peak of oil production, large quantities of gaseous hydrocarbons begin to enter the mass production stage due to the large amount of thermal cracking of liquid products. Due to the abundance of soluble organic matter in coal under geological conditions, further dissolution by soluble organic matter during high evolution is an important source of coal-to-coal gas. Non-hydrocarbons are mainly formed in the early stages. Methane is the main component of the gaseous hydrocarbons produced by mature coal, with non-hydrocarbon H2 being the main component, followed by CO2, the carbon isotope value of methane is obviously lower than that of ethane, while the difference of carbon isotope between ethane and propane is small, Increasing the degree of evolution of the gaseous components of the carbon isotope value difference is getting smaller and smaller.