Abstract: Three hydrocarbon- enriched belts to northeast-southwest have occured in northwesterm margin, binterland and eastem part of Junggar basin, and two belts to near est-west trend are probable to shape in hinterland and southem mangin of Julggar basin. Their for-mation and distibution are closely related to presence of fenestral and deep fauling (s) in the basinal basement. Particularly, the deep faulting to near-south-north trend is characterized by tensional and strike alip natures, being as “earthquake active zone” under the basin and ahaping a “highway” of the hydrocarbon and deep thermal material migration from south Io north. The cap rocks of the basin in these belts could be all as fracture- developed zones. These viewpoints have been supported in many aspects by analysis data from available crude oil and formation water. Based on such a viewpoint, the countermeasures and sugestions for petroleum exploration in the future are proposed in this paper.

Key words: Junggar basin, fault belt, petroleum migration, petroleum accumulation belt