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凝析油的特点是在地下以气相存在，采出到地面后则呈液态。文中采用凝析油轻烃分析、凝析油全烃分析和储层沥青饱和烃的色─质分析平方法，研究了我国川西、川西北及大庆昌德等高演化地区煤系凝析油的地球化学特征。结果表明：该类凝析油中轻烃含量低，芳烃含量高，烷基化指标发生倒转，储层沥青中一些生物标志化合物特别是甾烷的成熟度指标也出现了倒转。现己确定倒转发生在Ｒｏ＝１．５％～１．６％，倒转是由煤系地层中吸附的油解析而产生的。
Condensate oil is characterized by the presence of gas in the ground, was taken to the ground after the liquid. In this paper, the light hydrocarbon analysis of condensate oil, total hydrocarbon analysis of condensate oil and the colorimetric analysis method of reservoir asphalt saturated hydrocarbons are used to study the influence of condensate oil of coal measures in west Sichuan, northwestern Sichuan and Changde, Geochemical characteristics. The results showed that the light hydrocarbon content, the high aromatic content and the alkylation index of such condensate oil were reversed. The maturity indexes of some biomarkers, especially sterane, also reversed. It has now been determined that the inversion occurs at Ro = 1.5% to 1.6% and that the inversion is caused by the oil adsorbed on the coal strata.