Low-permeable abnormal high-pressure reservoirs own some characters that elastic energy is abundant

and reservoirs are under-compacted

and rocks are prone to elastoplastic deformation. According to these features

an approximate relationship of final recovery and petrophysical property based on Darcy’s law is achieved; and the concept of permeability variation factor is introduced to analyze the affecting factors on recovery rate. Taking West Wen-13 block for example

exploitation methods of such reservoirs are analyzed and discussed by means of permeability variation factor

combining with pressure sensitive experiment of different fluid permeability

experiments of permeability change in different pressure loading modes

and depressurizing elastic drive and water flooding experiments. The results show that a higher oil recovery can be obtained by maintaining slower depressurizing speed and higher pore pressure.