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本文根据松辽盆地生油岩、原油的异戊间二烯烷烃资料,全面地论述了盆地内生油岩、原油异戊间二烯烷烃的类型、分布特征和演化规律,指出:松辽盆地异戊间二烯烷烃的平面分布受沉积相带的控制,纵向上的变化则受成岩阶段的控制;未成熟生油岩按姥植比划分为两型,即植烷优势型生油岩和姥鲛烷优势型生油岩。文中探讨了这两型生油岩的不同演化途径,指出:松辽盆地属于植烷优势型生油岩,演化方向是植烷优势→姥植均势→ic_(15)+ic_(16)+ic_(18)优势,原油的异戊间二烯烷烃类型则和生油岩演化第的二阶段相一致。文中成功地应用了异戊间二烯烷烃资料在松辽盆地进行了油源对比和指示油气运移方向。
Based on the isoprenoid alkane data of source rock and crude oil in Songliao Basin, this paper comprehensively discusses the types, distribution characteristics and evolution of isoprenoid in the oil source and crude oil in the basin, and points out that the Songliao Basin The planar distribution of isoprenoid is controlled by sedimentary facies and the longitudinal variation is controlled by the diagenetic stage. The immature oil-derived rocks are divided into two types according to the ratio of basal setting, that is, the phytane-bearing type source rock and Pristane advantage superior type oil rock. The paper discusses the different evolutionary pathways of these two types of source rocks, and points out that the Songliao Basin belongs to the phytane-bearing source rock and the evolutionary direction is the phytotropy → the balance of plantation power → ic_ (15) + ic_ (16) + ic_ (18), the isoprenoid type of crude oil is consistent with the second stage of source rock evolution. The successful application of isoprenoid alkane data in the Songliao Basin oil source contrast and direction of hydrocarbon migration.