Estimation Of Formation Parameters Using Full Waveform Acoustic and Shear Wave Logs

摘要

A combination of borehole Stoneley waves from full waveform acoustic logs and directshear wave logs was used to estimate formation permeability and shear wave velocity.Data sets used here were collected by Area's array full waveform acoustic logging tooland shear wave logging tool. The P- and S-wave velocities of the formation are determinedby threshold detection with cross-correlation correction from the full waveformand the shear wave log, respectively. The full waveform acoustic logging data are alsoprocessed using the Extended Prony's method to estimate the borehole Stoneley wavephase velocity and attenuation as a function of frequency. Two different borehole modelsare considered for the inversion of Stoneley wave velocity and attenuation data. Theyare the isotropic elastic and the porous isotropic borehole models. Inversion parametersinclude shear wave velocity and formation permeability. Inverted shear wave velocitiesand permeabilities are compared with the shear wave log and the core permeabilitymeasurements, respectively, for an integrated interpretation and possible identificationof shear wave anisotropy.