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济阳坳陷低熟原油广泛分布于埋深小于２０００ｍ第三系储层。原油具有低饱烃、低饱／芳比、高非烃及甾、萜化合物保留高含量原始生物构型的特征。应用甾烷Ｃ２７、Ｃ２８、Ｃ２９相对丰度、萜烷中γ蜡烷含量和姥／植比可将全区低熟油划分为三类，展现了生源组成和介质环境对原油性质的影响。文章结合现代藻类的低温生烃模拟，探讨了低熟原油成因机理，提出了低熟原油系有机质早期低温演化阶段的产物，咸化的强还原环境富含低等藻类的生油层最有利于形成低熟原油的观点
Low-mature crude oil in Jiyang Depression is widely distributed in Tertiary reservoirs less than 2000 m in depth. Crude oil with low saturated, low saturated / aromatic ratio, high non-hydrocarbon and steroid, terpene compounds retain high content of the original bio-configuration characteristics. The relative abundance of C27, C28 and C29 in steranes can be divided into three categories according to γ-alkane content in terpanes and basal / plant ratio, which shows the influence of composition and environment of crude oil on the properties of crude oil. Based on the low-temperature hydrocarbon generation simulation of modern algae, the paper discussed the genesis mechanism of low-mature oil and proposed the product of early low-temperature evolution of low-mature crude organic matter. The salinized strong reduction environment is most conducive to the formation of low- Low-grade crude oil point of view