【摘要】 作者对5个盆地18个轻质油样品作了C₁—C₇轻烃分析,检测出29种单体轻烃。通过轻烃组成特征研究,认识到石蜡指数（PI₁）和庚烷值（PI₂）作为成熟度的指标,不受沉积盆地类型影响;C₆,C₇烃类族组分受母质类型影响较大。陆相（含煤地层）有机质生成轻质芳烃（苯）的含量比海相有机质要高。新疆塔里木盆地沙参2井原油的轻烃分析资料表明,该井油源岩为海相沉积。更多还原

【Abstract】 Light hydrocarbons（LH） of 18 light oils have been analysed and twenty-nine individual LH compounds were determined. Through analysing compositional characteristics ofLH, it is discovered that Paraffin Index（PI₁） and Heptane Value （PI₂） is still a good indicator of maturity in different sedimentary basins;hydrocarbon-type composition betweenC₆ and C₇ copmpound groups were greatly affected by organic matter types, and the content of aromatic hydrocarbon（benzene） generated by organic mateer of non-marine（coalseries） is more than that of LH derived from marine sources. The light hydrocarbon dataOf the crude oil from the well Shacan-2 indicate that the oil-source rock is produced inmarine deposit.更多还原