下剛果盆地Haute Mer A區(qū)塊X-1井原油油源研究
[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.
【作者單位】: 中海油研究總院;
【基金】:國(guó)家科技重大專項(xiàng)“海外大陸邊緣盆地勘探開發(fā)實(shí)用新技術(shù)研究”(2011ZX05030-001)
【分類號(hào)】:P618.13
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