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苏北盆地是中国东部唯一发现的上白垩统自生自储工业油藏的盆地。通过分析上白垩统泰州组 20 个油砂和 1 个原油样品芳烃化合物,发现芳烃馏分以三芳甾烷系列为主,指示母质沉积水体咸化和原油低成熟。来源于高等植物的生物标志物丰度低,反映原油母质以腐泥型为主。芳烃各组分相对含量、三芴系列相对含量和比值、二苯并噻吩/菲等参数反映了原油母质总体形成于强还原的咸水环境,不同地区的还原性存在差异。海安凹陷和高邮凹陷北坡的泰州组原油同属一族群,而吴堡低凸起泰州组原油属于另一族群。利用甲基二苯并噻吩比值换算的镜质组反射率(Ro),推测海安凹陷泰州组原油来源于泰州组未-低熟烃源灶,高邮凹陷北坡的泰州组原油来源于就近泰州组的低熟烃源灶,而吴堡低凸起泰州组原油来源于邻区高邮深凹成熟的阜宁组烃源灶。研究结果对指导油气勘探具有实际意义。
The Subei Basin is the only basin of the Upper Cretaceous self-contained industrial reservoir discovered in eastern China. By analyzing the aromatic compounds in 20 oil sands and 1 crude oil sample of the Upper Cretaceous Taizhou Formation, it is found that the aromatic hydrocarbon fraction is dominated by the triarylstane series, indicating that the sedimentary water bodies of the parent material are salty and the crude oil is lowly mature. Biomarkers derived from higher plants have low abundance, reflecting the fact that the parent material of the crude oil is mainly sapropelic. The relative content of aromatics, the relative content and ratio of trifluorene series, dibenzothiophene / phenanthrene and other parameters reflect the overall formation of crude parent material in the strong reduction of salt water environment, there are differences in the reduction of different regions. The Taizhou Formation crude oil in both the Hai’an Sag and the northern slope of the Gaoyou Sag belong to the same ethnic group, whereas the crude oil belonging to the Taizhou Formation in the Wubao low uplift belonged to another ethnic group. According to the vitrinite reflectance (Ro) calculated by methyldibenzothiophene ratio, it is speculated that the crude oil in Taizhou Formation in Haian Sag originated from the non-low-maturity hydrocarbon source stove in Taizhou Formation and the Taizhou Formation crude oil in the northern slope of Gaoyou Sag originated from nearby Taizhou Formation Of low-maturity hydrocarbon source stove, and Wubao low Protuberance Taizhou crude oil source comes from the Gaoyou deep maturity Funing Formation source stove. The results of the study have practical significance for guiding oil and gas exploration.