Abstract: East3 member and Cha3 member of Cha 12 sector in Chaheji Oilfield is complicated fault-block reservoir with low-permeability, mid-pore, high-saturation-pressure, high-heterogeneity. There are grown faultage, crashed conformation, un-stability and small area of sand distribution in landscape orientation. Now, the oilfield is at high-water-cut stage. In order to improve development effectiveness, the paper studies the reasonable technical development plans that improve production at high-water-cut stage by applying simulation methods. It determined the plans through scheme optimization. That is: the reservoir in the future should be water flooding. The major means should be adjust with chemistry flooding, but not with re-perforation or altering layers etc. The implement effectiveness shows that the study accomplishment have more strong guide meaning for oilfield development.

Key words: numerical simulation, residual oil distribution, chemistry flooding, main productive layers, non-active layers