腐殖煤气态产物演化特征的模拟实验研究

The Evolution Characteristics of Gaseous Products of Humic Coal and Its Geological Significance

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 of humic coal by hydrouspyrolysis and its geological significance are discussed,Mature humic coal has still large hydrocarbon potential,in main stage of hydrocarbon generation,and it mainly generates oil and a little gaseous hydrocarbon.After oil generation peak,the amount of gaseous hydrocarbons begins increasing rapidly because of splitting of liquid products.In geological condition,there are enormous soluble organic matter in coal.They are main source rocks of coal type gas in high evolution stage.Methane is predominant component of gaseous hydrocarbons.Gaseous non hydrocarbons are generated in the early stage and in them,dioxide carbon is chief.