下刚果盆地Haute Mer A区块X-1井原油油源研究

发布时间：2018-10-05 10:42

【摘要】：对下刚果盆地Haute Mer A区块X-1井3个原油样品及X-1井、M-1井上白垩统、古近系共14个岩屑样品进行详细的分析研究,其结果表明X-1井原油生物标志化合物组合特征与南大西洋典型湖相烃源岩具有明显区别。X-1井原油(1982.1~1989.2m)Pr/Ph比值低(0.97),Pr/n C_(17)和Ph/n C18分别为0.85和0.96,C_(26)/C_(25)三环萜烷小于1.0,C_(30)四环聚异戊二烯烷烃/C_(27)重排甾烷比值低(0.55),具有海相烃源岩特征。原油中奥利烷丰度高,指示其来自上白垩统或以上的烃源岩。油源对比表明X-1井原油与上白垩统—始新统Madingo组烃源岩具有成因上的联系。盆地模拟研究进一步证明中新统Paloukou组烃源岩局部成熟,供烃能力有限;而Madingo组烃源岩目前正处于生、排烃高峰期,沉积中心则处于高—过成熟阶段,X-1井紧临Madingo组生烃洼陷,有利于油气聚集成藏。因此,推断Madingo组烃源岩为X-1井原油的主要贡献者。
[Abstract]:Three crude oil samples from X-1 well in Haute Mer A block of Lower Congo Basin and 14 cuttings samples from Paleogene from Upper Cretaceous and Paleogene in X-1 well M-1 well are studied in detail. The results show that the assemblage characteristics of crude oil biomarkers in X-1 well are obviously different from those of typical lacustrine source rocks in the South Atlantic Ocean. The Pr/Ph ratios of crude oil (1982.1 / 1989.2m) of well X-1 are low (0.97) PrnC17 and Ph/n C18 are 0.85 and 0.96C _ (26) / C _ (25) trichloroterpene less than 1.0C _ (30). The ratio of alkene / C _ (27) rearranged steranes is low (0.55) and has the characteristics of marine source rocks. The high abundance of olinane in crude oil indicates that it comes from the source rocks of the Upper Cretaceous or above. The oil source correlation shows that the oil of well X-1 has a genetic relationship with the source rocks of the Madingo formation of the Upper Cretaceous and Eocene. The basin simulation further proves that the source rocks of the Miocene Paloukou formation are locally mature and their hydrocarbon supply capacity is limited, while the source rocks of the Madingo formation are currently in the peak period of hydrocarbon generation and expulsion, and the sedimentary center is in the high-over-maturation stage, where the hydrocarbon generating sag of the Madingo formation is close to the X-1 well. It is favorable for oil and gas accumulation to form reservoir. Therefore, it is inferred that the source rock of Madingo formation is the main contributor of well X-1 crude oil.
【作者单位】：中海油研究总院;
【基金】：国家科技重大专项“海外大陆边缘盆地勘探开发实用新技术研究”(2011ZX05030-001)
【分类号】：P618.13

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