Massachusetts Institute of Technology. Earth Resources Laboratory
Abstract
A combination of borehole Stoneley waves from full waveform acoustic logs and direct
shear 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 tool
and shear wave logging tool. The P- and S-wave velocities of the formation are determined
by threshold detection with cross-correlation correction from the full waveform
and the shear wave log, respectively. The full waveform acoustic logging data are also
processed using the Extended Prony's method to estimate the borehole Stoneley wave
phase velocity and attenuation as a function of frequency. Two different borehole models
are considered for the inversion of Stoneley wave velocity and attenuation data. They
are the isotropic elastic and the porous isotropic borehole models. Inversion parameters
include shear wave velocity and formation permeability. Inverted shear wave velocities
and permeabilities are compared with the shear wave log and the core permeability
measurements, respectively, for an integrated interpretation and possible identification
of shear wave anisotropy.Massachusetts Institute of Technology. Borehole Acoustics and Logging ConsortiumUnited States. Dept. of Energy (Grant DE-FG02-86ER13636
