Abstract: The Permian of Wuerhe-Xiazjie (Wu-Xia) area in Junggar basin was in the early-middle period of foreland basin. Being affected by different factors, such as fault movement, volcanic action and sedimentary source, in the Early Permian, there developed volcanic rock, pyroclastic rock and normal clastic rock. The volcanic action was weakened gradually upward. In the Middle-Late Permian, the foreland basin changed to down-warped basin gradually. And its Fengcheng depositional stage there was a big lake transgression and the depocenter migrated to the south. In Xiazijie depositional stage and Lower W uerhe depositional stage, there widely developed fan delta and lacustrine facies assemblage with a basal level cycle of ascending- descending- ascending from botom to top. The development of volcanic reservoirs are controlled by lithology and structure, while that of clastic reservoirs by sedimentary facies. In general, the most favorable reservoir space types include the intragranular dissolved pore in the sands of underwater distributary channel of fan delta front, the fissures of pyroclastic rock in mobile belt and the vesicular pore of volcanic rock in deep zone.

Key words: Junggar basin, Wuerhe, Xiazijie, Permian, sedimentary feature, reservoir