Among the methods for estimating the minimum phase wavelet from its amplitude spectrum, methods of Hilbert-transform, of homomorphy, of zero-phase wavelet and of relaxation-iteration are analysed.

During the processing of seismic data interpretation of Tahe Oilfield, pseudomorphism of adjoint phase caused by non zero phase wavelet was easily interpreted as effective reflection.

The actual non zero phase wavelet was extracted from seismic traces by comparing synthetic seismogram with near wellbore seismic traces and was used to be deconvolved with seismic data.