摘要
The oil sources in the Yanchang Formation of the Ordos Basin has always been controversial in the reservoir Chang-8 to Chang-10. According to the crude oil of Chang-6 to Chang-10 of Yanchang Formation in Wubao area,this paper discusses the physical properties,the group composition,the biomarkers,and the oil-oil and oil-source correlation in terms of their geneses and the origin of petroleum in respective reservoirs so as to provide the geological basis for the area’s petroleum exploration and prediction.The result shows that the group composition of Chang-6 to Chang-10 is characterized by the highest content of the saturated hydrocarbon,which follows the aromatics,and non-hydrocarbons are the lowest.The thermal maturity should be the most responsible for the differences between crude oil group compositions which are far away from the dominant source rocks.