The new method of processing the slowness of P and S-wave from waveforms of array sonic logging

From array sonic logging data, the 2D spectrum can been obtained by Matrix pencil method. Using the spectrum, the slownesses of P-wave, S-wave and Stoneley wave are calculated by two new methods that are called phase velocity and group velocity in this paper. The calculated result is the same as STC, but the characterization of dispersion for P-wave and S-wave are displaced by the width of distribution in the processing results. By processing the data of dipole and monopole sonic logging, the slownesses of S-wave agree with each other.