Remaining oil distribution pattern and potential measures of faulted-block oilfield during high water cut stage

Core displacement experiment shows that remaining oil distribution in tiny pore distributed as shapes of speckle and meshwork.On the other hand,it is revealed by numeral simulation that remaining oil distributes as 5 types,such as controlled by fault,by micro - structure,by sedimentary, by well net,and so on.Based on remaining oil distribution, a series of methods to optimize well pattern are applied such as subdivision development series of strata,changing well type,etc,which improves the recovery of H_3 segment of Xia 'ermen oilfield from 33.7%to 37.5%.