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Two-dimensional spectrum analysis in sonic logging

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1 Author(s)
McClellan, James H. ; Austin Engineering Center, Schlumberger-Doll, Austin, TX

Properties of the rock formation surrounding a fluid-filled borehole can be measured by sonic logging. Full-waveform recordings made by a receiver array are routinely processed to estimate the compressional and shear velocities. Other wave components, such as the normal modes, can be extracted by using two-dimensional spectral analysis techniques. A limited spatial array aperture constrains the resolution of techniques based on beamforming or Fourier analysis. The method discussed here employs the extended Prony method to do a high-resolution spatial-frequency analysis. Examples are presented to illustrate the method when tracing the velocity dispersion of the normal modes of the acoustic wavefield.

Published in:

ASSP Magazine, IEEE  (Volume:3 ,  Issue: 3 )