Abstract:By using plane-wave analysis technique,we have developed,on the basis of wave theory,a novel phase shift method for estimating common-offset section model.The paper describes the deduction of formulae and gives the relevant generalized differential equations of upgoing waves.The phase shift method for estimating common-offset section model works in wavenumber domain,and is suitable to any common-offset sections in constant velocity medium.What is more,it can cope with the problems relating to prestack and poststack modelings.Theoretical modeling proves the method correct.