Abstract: Based on study conducted for effect evalution of fault sealing of Lukeqin structural belt both at the pre- sent time and at pool-forming time,it is discovered that the structure belt has been strongly compacted in north-east trend and displayed good effect of sealing. While that of northwest trend faults are less good. However, the sealing effect occurred at the time of pool-forming stage is contrary to the above mentioned. The different effect of fault sealing at pool-forming period determined the general configuration of oil-gas distribution, while the current fault sealing features played a dominant role in oil-gas preservation and the. height of oil-column. Finally, the fuzzy comprehensive evaluation was made on the oil-controlling fault, it is recognized that due to the poor effect of this region's fault block trapment,it cannot prov ide necessary conditions for thin crude accumulation in a large scale. But it will show rather good sealing effect for certain viscous heavy crude.

Key words: Turpan basin, Lukeqin, fault, sealed reservoir, geologic history, stress, plugging, evaluation