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通过对伊犁盆地伊宁凹陷宁3、宁4井烃源岩抽提物的分析，总结出侏罗系烃源岩饱和烃特征为低的轻重比，高的姥鲛烷与植烷比值，规则甾烷中C29含量高，C27、C28含量低；二叠系、三叠系烃源岩饱和烃特征为高的轻重比，低的姥鲛烷与植烷比值，规则甾烷中C29含量较低，C27、C28含量较高。由此进一步推测出侏罗系烃源岩沉积时沉积水体较浅，陆生高等植物输入为主，而且是在较氧化条件下沉积的；而二叠系、三叠系烃源岩沉积时沉积水体较深，低等水生生物具有重要贡献，沉积环境较侏罗系偏于还原。
Based on the analysis of the source rocks of Ning 3 and Ning 4 wells in the Yining Depression of the Yili Depression, the conclusion is drawn that the saturated hydrocarbon of the Jurassic source rocks is characterized by a low ratio of light to heavy and a high ratio of pristane to phytane. The rules The content of C29 in sterane is high and the content of C27 and C28 is low. The saturated hydrocarbons in Permian and Triassic hydrocarbon source rocks are characterized by high light weight ratio and low ratio of pristane to phytane, and low content of C29 in regular steranes , C27, C28 content is higher. It is further speculated that the Jurassic source rocks deposited shallow sedimentary water, terrestrial plants higher input, and more under the conditions of oxidation deposition; and Permian, Triassic sedimentary deposition Deep water, lower aquatic organisms have an important contribution to sedimentary environment than the Jurassic partial reduction.