Abstract: Starting with classification of transient testing Horner curve patterns and considering reservoir performance characteristics, this paper made a classification of reservoir flow system and preliminarily determined characteristics parameters and development characteristics of different flow systems.The reservoir flow systems can be classified into three types (pore, dual porosity and fracture flow syatems)composed of five subtypes.Particularly, a combination mode of dual porosity “series-parallel connection” flow system was presented, which has important reference value for either working out the development plan in new oil areas or drawing up the development policy in old oil areas.

Key words: Transient testing, Curve, Percolation, Model, Pore, Fracture