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对松辽盆地南部梨树断陷八屋、孤家子、后五家户、皮家等油气田天然气样品的C6—C7轻烃化合物首次开展了系统的地球化学对比研究,结合天然气碳同位素组成特征,认为研究区天然气样品普遍贫芳香烃,绝大多数样品C6—C7饱和烃具链烷烃优势,尤以正构烷烃含量最高,环烷烃含量相对较低,表明该区天然气的母质类型主要为腐泥型;研究区Mango轻烃稳态动力学常数K1基本保持恒定,来自湖相烃源岩的C7轻烃中三环优势(3PR)大于五环优势(5PR)和六环优势(6PR),与Mango的结论一致。庚烷值、异庚烷值多较高,寓示该区天然气主要为高熟—过熟的裂解气,与该区天然气甲烷碳同位素组成普遍偏重相吻合。
For the first time, a systematical geochemical study was carried out on C6-C7 light hydrocarbon compounds in the natural gas samples of Yawu, Guogujia, Houwujiahu and Pijia oilfields in the Lishu Depression of the southern Songliao Basin. Combining with the characteristics of carbon isotope composition of natural gas , Most of the sample C6-C7 saturated hydrocarbons have the advantages of paraffins, especially the highest n-paraffins and the lower paraffins, indicating that the natural types of natural gas in this area are mainly rot Muddy type. The steady-state kinetic constant K1 of light hydrocarbon in Mango remained constant in the study area. The triad advantage (3PR) of C7 light hydrocarbons from lacustrine source rocks was greater than that of pentacyclic (5PR) and hexagonal (6PR) Consistent with Mango’s conclusion. Heptane and iso-heptane values are higher, indicating that the natural gas in this area is mainly mature and over-mature pyrolysis gas, which is consistent with the general preference of the methane carbon isotope composition of natural gas in this area.