The main pay zones in the Qiudong condensate gasfield of TurpanHami Basin are sandstone intervals in the middle part of Xishanyao Formation of Middle Jurassic, which can be divided into two gas pools, the upper pool (X4-X5) and the lower pool (X6-X9). Though reservoirs of the upper and lower gas pools are both mouth bar sandstones and distributary channel sandstones, there are evident differences in their petrophysics, heterogenity and  geometric characteristics. The upper gas pool and the lower gas pool were in different locations during the baselevel cycle and had different effects by different facies differentiation, thus they had obvious differences in reservoir heterogenity and sandbody geometric characteristics. The results show that the petrophysical properties of the upper gas pool are obviously better than those of the lower gas pool. High resolution sequence stratigraphy based on the base level cycle can be effectively applied to the prediction of lateral and vertical distribution of reservoirs and is profitable for exploration and development of petroleum reservoirs.