Nullerical Studies of Body Wave Amplitudes in Full Waveform Acoustic Logs
Name
1984.4 Zhang et al.pdf
Size
569.9 KB
Format
Adobe PDF
Checksum (MD5)
b38894e3e62faa6063bbc255683b15e4
Author(s)
Zhang, Jinzhong
Cheng, C. H.
Date Issued
1984
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1984-04
Abstract
The amplitudes of P and S head waves in a full waveform acoustic log microseismogram are studied numerically as a function of borehole and formation parameters. The technique used is contour integration around the respective branch cuts in the complex wavenumber plane (Tsang and Rader, 1979). The results showed that the P wave amplitude depends on the Poisson's ratio, but the S wave amplitude does not. The well accepted geometric
spreading factor for P and S waves in the "far field" is only valid for a limited
range of source-receiver spacings, and the onset of "far field" depends on the Poisson's ratio as well as the wavelength. The wave shape factor I[subscript e] for the P wave as defined by Lebreton et al. (1978) has a direct relationship to in situ attenuation.
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