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- Title
Explicit use of the Biot coefficient in predicting shear-wave velocity of water-saturated sediments.
- Authors
Lee, Myung W.
- Abstract
Predicting the shear-wave (S-wave) velocity is important in seismic modelling, amplitude analysis with offset, and other exploration and engineering applications. Under the low-frequency approximation, the classical Biot–Gassmann theory relates the Biot coefficient to the bulk modulus of water-saturated sediments. If the Biot coefficient under in situ conditions can be estimated, the shear modulus or the S-wave velocity can be calculated. The Biot coefficient derived from the compressional-wave (P-wave) velocity of water-saturated sediments often differs from and is less than that estimated from the S-wave velocity, owing to the interactions between the pore fluid and the grain contacts. By correcting the Biot coefficients derived from P-wave velocities of water-saturated sediments measured at various differential pressures, an accurate method of predicting S-wave velocities is proposed. Numerical results indicate that the predicted S-wave velocities for consolidated and unconsolidated sediments agree well with measured velocities.
- Subjects
GEOPHYSICS; SHEAR waves; GEOPHYSICAL prospecting; EARTH sciences; GEOTHERMAL engineering; GEOPHYSICAL instruments
- Publication
Geophysical Prospecting, 2006, Vol 54, Issue 2, p177
- ISSN
0016-8025
- Publication type
Article
- DOI
10.1111/j.1365-2478.2006.00524.x