Abstract: Junggar basin has now been entered into the strategic turning stage for non-structural oil-gas rese凹oir prospecting. Given depositional features of Jurassic and Cretaceous, this paper presents the dominant factors that shape the nonstructural reservoir and favorable areas searching for such reservoirs. The study indicates that deposits of fluvial facies and delta facies are dominant belts for forming the non-structural traps in hinterland of Junggar basin; the unconformity between Jurassic and Cretaceous acts as the major channel for petroleum migration; the northeastward salient of Late Jurassic has significant effect on controlling the formation of non-structural reservoirs,and the northwestern margin slope, the Luliang south slope, especially the north slope of Changji sag in Junggar basin are favorable areas for forming the non-structural reservoirs. The explorative practice shows the best way searching for the non-structural reservoirs in Junggar basin should be full application of 3-D seismic fruits and detailed research of depositional strata as target zones under the proper calibration of regional prospecting wells.

Key words: Junggar basin, continental facies, slopezone, non-structural reservoir, petroleum exploration