Abstract: Old oilfield is taken as an example to study different variation characteristics of reservoir permeability and porosity parameters which are closed to rational exploitation of remaining oil around water injection in old oil fields.On the comparing of coring parametric variation around water injection，three types about the special variation on parameters of reservoir physical property are presented，i.e.，the main frequency gets narrower，the main frequency aggrandizement and constringency to its high value region，both of them aggrandizement evenly.The relationship among sedimentary rhythm， containing water characteristics and three types of reservoir parameter variations are discussed.According to the change of porosity and permeability，which is affected by practice of water injection，the temporal variation of parameters of reservoir physical property is discussed.The research shows that the effective ways of reasonable tapping the remaining oil potential are to determine different types of reservoir parameters and design pertinence scheme for injection and production.

Key words: reservoir physical property, the variation of parameters, old oilfield, sedimentary rhythm, water- containing characteristics, remaining oil