Abstract: According to the characteristics of layered reservoirs and the problems that have occurred during production and in combination with comprehensive seismogeologic study results and drilling data, this paper builds a 3 - D Paleozoic model and performs numerical simulation on a three - dimensional and three - phase dual medium model of black oil by using deterministic dodel building methods. Simulation results are compared with analogous oilfields. Some preliminary measures, including maintaining producing energy through water injection and reperforating the top pay zones, are presented to improve well yield and to increase level of producing reserves.