Abstract: The slump-turbidity fan systems discovered in Sangonghe formation of Jurassic in eastern Fukang sag of the Junggar basin occur below the slope break in deep-water lake shale environment, above which there exist delta deposits of shore-shallow lake facies. The slump-turbidity fan systems are resulted from re-migrating toward deep-water position and deposition of the delta frontal sand bodies in form of turbid flow under the process of trigger factor. The channel sands in the fan systems are as good oil-gas reservoirs. Because the slump-turbidity fan sands directly covered by deep-water lacustrine shale are close to the source rocks, they could form good lithologic reservoirs. It is concluded that the slump-turbidity fan systems should be a new domain for petroleum exploration of the Jurassic in eastern Junggar basin.

Key words: Junggar basin, Fukang sag, slump-turbidity fan, sedimentary characteristic, lithologic reservoir