Abstract: In view of the characteristics in C6 block such as complicated block structure, nonuniform producing reserves laterally and poor waterflooding, based on further recognition of reservoir configuration and accurate analysis on the distribution of remaining oil, the traditional way of reservoir subdivision has been broken up. Now the new way is to combine the non - essential reservoirs with poor physical property and lower degree of production into one suit of layer system, which receives great effect and will provide valuable reference for the same type reservoir during the intermediary and later stage of development adjustment.