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凝析油的特点是在地下以气相存在，采出到池面后则呈液态。文中采用凝皙油轻烃分析、凝析全烃分析和储层沥青饱和烃的色－质分析等方法，研究了我国川西、川西北及大庆昌德等高演化地区煤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，烷基化指标发生例转，储层沥青中一些生物标志合物特别是甾烷的成熟度指标也出现了倒。已确定倒转发生在Ｒｏ＝１．５％－１．６％，倒转是由煤系地层中吸附的油解析而产生的

GEOLOGICAL CHARACTERISTICS OF COAL-MEASURE CONDENSATE IN HIGH-EVOLUTION AREA

??The geochemical characteristics of coal-measure condensate in the high evolution areas such as West Sichuan, Northwest Sichuan and Changde in Daqing in China are studied by analysing condensate lighter-hydrocarbon, condensate total hydrocarbon, the saturation of reservoir's asphalt and the colour-quality of hydrocarbon.The result showes that in this type of condensate, the lighter-hydrocarbon's content is low.aromatic hydrocarbon's content is high, the indexes of alkylate and some biomarkers(specially being the maturity of sterane) in reservoir asphalt are reversed when R_o=1.5%-1.6%.The reversal is caused by the oil analyticity adsorbed in coal-measure strata.