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根据长岭凹陷晚白垩系烃源岩的有机岩石学、沉积学和有机地球化学特征,划分为深湖半深湖有机相、滨浅湖有机相和三角洲有机相。3种沉积有机相类型中,深湖半深湖有机相腐泥组分含量较高,有机质类型为I型,生烃性最好;滨浅湖有机相腐泥组分含量较低,有机质类型以Ⅱ1为主,生烃性较好,深湖半深湖有机相、滨浅湖有机相主要分布在凹陷中心;最后通过对地球化学特征的评价,认为嫩一、二段和青一段为好烃源岩,嫩三段和青二、三段为较好烃源岩,嫩四段为次要烃源岩。
According to organic petrology, sedimentology and organic geochemical characteristics of Late Cretaceous source rocks in Changling sag, they are divided into deep-lake semi-deep lake organic phase, shallow lake organic phase and delta organic phase. Among the three sedimentary organic facies, the lacustrine half-deep lacustrine lacustrine lake has a high content of organic matter saprolite, the organic matter is type I and the hydrocarbon generation is the best. The main hydrocarbon is Ⅱ, the hydrocarbon generation is better, and the organic phase in the deep-lake half-deep lake and the shallow lake are mainly distributed in the center of the depression. Finally, through the evaluation of the geochemical characteristics, it is considered that the first, second and Qingyi segments are good The source rock, the third member and the second member are the better source rocks, and the fourth member is the secondary source rock.