Abstract: There exist two major fault systems in Luliang uplift of Junggar basin, i.e. deep fault system and middle-shallow fault system. The main faults such as Lunan, Jidong and Jinan are connected to the hydrocarbon sources. Among them, Lunan fault and 'idong fault possess structure of normal fault in the upper part and reverse one in the lower part; Iinan fault is a reverse fault without normal one in the shallow part; the upper part of Jidong fault appears normal fault with good lateral block-off property, favorable to form reservoir laterally blocked off by the fault; while in the upper part of Lunan fault occurs poor lateral block-off nature of normal fault and open in the vertical. It is indicated that Jinan fault activity stage well matches to the primary oil-generating or oil accumulation period in Fengcheng source rocks, till Triassic the fault plays a part of passage of oil-gas migration. For reverse faults of 'idong and Lunan, their matching relations to hydrocarbon accumu-lation are similar with that of Jinan fault, but their upper normal fault movement periods are right to fit the primary oil-generating period of Wuerhe formation which is called the second period of hydrocarbon accumulation. In Middle Jurassic to Early Cretaceous, these faults could be as good passages for oil-gas migration. It is concluded that the faults developed in Yanshan movement epoch play a significant role in the primary reservoirs’ preservation, reconstruction and destruction and the secondary reservoirs’ formation, preservation and reconstruction in this area.

Key words: Junggar basin, Luliang uplift, fault, hydrocarbon migration and accumulation