Hilbert-semblance method for acoustic logging data processing
R.D. Akhmetsafina, V. Dubinskii b , D. Patterson b
a Geofizika Association, Ltd., 12 ul. Vos'mogo Marta, Ufa, 450005, Russia
b Baker Hughes, P.O. Box 670968 (77267-0968), 2001 Ranking Road, Houston, 77073, Texas, USA
Keywords: Low-frequency logging; semblance method; Hilbert transformation
Pages: 692-697
Subsection: GEOPHYSICS
Abstract
We suggest a method of multi-element low-frequency acoustic logging data processing which combines advantages of the semblance and phase velocity processing (PVP) techniques, namely, the interference resistance in the former and better accuracy in the latter. The new method is based on point (windowless) semblance by the Hilbert transformation. The introduced concept of phase semblance makes it possible to estimate the signal distribution semblance and the phase. Also suggested are an algorithm for preliminary estimation of formation S-wave slowness from signal group power variations and improved forms of processed data imaging.
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