Abstract: According to the geochemical features, regional structural development history and the comprehensive geological-geochemical analysis on the basin simulation result,it is identified that the crude oil in Well Lu 9 mainly came from the source rocks of Fengcheng formation and Lower Wuerhe formation in the Well Pen 1 west sag and is dominated by the latter. It is suggested that the reservoir of Xishanyao formation was formed under remigration after the allochthonous reservoir was destroyed during the end of early Cretaceous and Tertiary,while the reservoir in Toutunhe formation were formed in twofold with the first autochthonous oil generation occuring at Middle-Late Jurassic in Fengcheng formation,and the second during the end of early Cretaceous to late Cretaceous in Lower Wuerhe formation, while the Cretaceous reservoir was formed under remigration after the Tertiary allochthonous two -stage reservoir had been destroyed.

Key words: Junggar basin, Luliang uplift, terpane, source bed, reservoir formation, crude oil analysis