Abstract: Through analysis on the experimental data of core, common thin section, cast thin section, SEM and high?pressure mercury injection, correlation and analysis on lithological features, reservoir space types, physical properties and pore structures are carried out for each stress intervals of Bashijiqike formation in Wellblock Keshen?5 in Kelasu structural belt, Kuqa depression. The result shows that different stress intervals are similar to each other, all of which are dominated by lithic feldspar sandstone cemented by calcite, but the clastic particles in extensional stress interval are mainly spot and spot-line contacts and that in transitional interval are dominated by line contact, that in transpressional interval are in directional alignment; matrix pore types are different in different stress intervals, the average reservoir porosity gradually decreases and the average permeability becomes larger from the extensional stress interval to the transpressional interval.The pore structure varies in different stress intervals, the capillary pressure curves of the reservoirs are mainly Type Ⅰ and Ⅱ in the extensional interval, which is featured with low displacement pressure and median pressure, high mercury?intrusion saturation, large average porethroat radius, even pore throats and good connectivity; the capillary pressure curves of the reservoirs are dominated by Type Ⅳ in the transpressional interval, which is featured with small pore?throat radius, poor pore?throat sorting and connectivity, irregular distributed displacement and median pressures due to the influence of microcracks; the reservoirs in transitional interval have moderate features between extensional and transitional intervals. The results of the study verify the vertical zonation of Bashijiqike reservoir in Wellblock Keshen?5,and change the conventional method for lithology?based reservoir correlation and analysis