中文摘要：

分析了鄂尔多斯盆地延长组原油的生物标志化合物组成特征,并对其进行油源对比,探讨了其成因。研究表明,鄂尔多斯盆地上三叠统延长组原油属于同一成因类型;原油有机母质为菌藻类和高等植物的混源型,原油形成于弱还原和淡水或微咸水环境,为成熟原油。油源对比表明,鄂尔多斯盆地上三叠统延长组原油主要来自长7油层组烃源岩。

英文摘要：

The biomarkers of crude oils of Yanchang Formation in Ordos Basin were studied in this paper,and the oil-source correlation and their genesis were discussed.The data indicate that the studied oils are of the same genetic type and the oil-forming matrixes are algae and higher plants.The crude oils were formed under the weak reducing and fresh water environments.The crude oils are mature.The crude oils in the Yanchang Formation of Upper Triassic were mainly originated from the Chang-7 oi1 bed group.