STUDY OF FAULT SEALING IN CHEPAIZI REGION IN THE WEST OF JUNGGAR BASIN

Faults in Chepaizi region in the west of Junggar Basin are mainly high-angle normal ones with small fault displacements.There are mainly 4 fault types: late faults generated both deep and shallow,interzonal faults,late faults generated only shallow and early faults generated since the early Hercynian.The study region is mainly of bar and bank facies lithologic traps.Fault migration is the key for hydrocarbon accumulation.According to stress analysis,synthetic fuzzy judgment and nonlinearity representation,6 important faults in the region are evaluated with 2 shale smear factor methods.Sealing studies are done in the fault in the south of Well Pai 208 and the fault in the east of Well Pai 17.The faults work as effective sealing in the Taxihe Formation,characterized by opening down and closing up.There are both passages and top sealing for hydrocarbon.The studies have provided useful information for hydrocarbon exploration and got good industry reserves in the region.