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.It was necessary to extract impedance reflectivity based on environmental correction of sonic and density data

to extract actual non zero phase wavelet from seismic trace by comparing synthetic seismographic record with seismic trace near wells

and process seismic data with wavelet deconvolution. The processed seismic data had clear reflection character

high resolution and eliminated the pseudomorphism caused by non zero phase wavelet. The variance of coherency on the basis of processed seismic data showed clearly the characteristics of karst phenomenon on the top of Ordovician.