论文部分内容阅读
根据GC、GC-MS等分析结果表明,渤南洼陷沙河街组四段下亚段原油正构烷烃分布呈单峰形态,高碳数C22—C34范围内具有明显偶碳优势,类异戊二烯烷烃呈植烷优势,伽马蜡烷、4-甲基甾烷、孕甾烷和升孕甾烷含量较高,重排甾烷不发育,C35升藿烷丰度明显高于C34升藿烷,芳烃中三芳甾烷的含量较高,三芴系列中硫芴含量丰富,均表明源岩沉积于富硫的强还原的半咸化—咸化湖相环境,并且C2920S/(20S+20R)值分布在0.49~0.55之间,属于典型的成熟油。通过油源对比认为沙河街组四段下亚段红层原油来自该区沙河街组四段上亚段烃源岩。
According to the results of GC and GC-MS analysis, the n-alkane distribution of crude oil in the lower section of the fourth member of Shahejie Formation in the Bonan Sag is single peaked, and the C22- The diolefin showed the advantage of phytane. The contents of gamma-alkane, 4-methyl-sterane, pregnane and rispelastane were higher than those of C34-liter Hopane and aromatics. The abundance of thiofluorene in the fluorene series indicate that the source rocks are deposited in the semi-salted-salty lacustrine environment with strong reduction of sulfur, and C2920S / (20S + 20R) value distribution between 0.49 ~ 0.55, is a typical mature oil. According to the comparison of oil sources, the red beds of the lower section of the fourth member of Shahejie Formation are derived from the source rocks of the upper member of the fourth member of Shahejie Formation in this area.