Abstract: Beginning with geometry of reservoir architectural elements and features of physical property distribution,this paper studies the impacts of various architectural el-ements on injection -production capacity of oil layers and further analyzes the degree of control of the exist-ing well pattern over architectural elements and well pattern control methods over different architectural ele-ments.Development wells should be positioned away from underwater dis tributary channels and the central part of mouth bar with strong water absorbing and liq-uid pro ducing capacity at the late development stage with high water-cut.In combination with stabilization of oil pro duction and water-cut control and adjustment of in jec tion-pro duction structure,injection-production well spacing can be appropriate ly shortened where there exist updip pin chout sand sheet with poor water absorbing and liquid producing capacity to control each single sand body and enhance waterflooding oil recovery.