Centroid phase slowness as a tool for dispersion correction of dipole acoustic logging data

摘要

We develop a simple and efficient method for correcting the borehole flexural-wave slowness dispersion effects. We demonstrate its validity on synthetic and field data. The theory underlying the method is derived from first principles and shows the general result that semblance-derived wave slowness is a spectral-amplitude weighted average of the wave-slowness dispersion curve. The theory also explains that a dispersion correction on the borehole flexural wave slowness is not necessary if the source frequency content is sufficiently low.