KEY FACTORS TO CONTROL FORMATION CONDITIONS OF STRATIGRAPHIC POOLS IN CHEPAIZI AREA, THE WEST OF THE JUNGGAR BASIN

Based on analysis of strata,structure,facies and petroleum in Chepaizi area in the west of the Junggar Basin,accumulation types in this region have been counted.Studies of source condition,reservoir characteristics,conducting characteristics and trap preservation,together with drilling success and failure effectivity,have indicated that,traps in Chepaizi area are mainly lithologic ones.Source condition is good.Faults and unconformities work as complex conducting system.Favorable reservoir facies and physical properties control petroleum accumulation.Trap condition and its preservation are the keys for final accumulation.Reservoir physical property and reservation are the main factors controlling lithologic pool formation in this area.