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Explicit use of the Biot coefficient in predicting shear-wave velocity of water-saturated sediments

Geophysical Prospecting

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DOI: 10.1111/j.1365-2478.2006.00524.x

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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 agreewell with measured velocities. ?? 2006 European Association of Geoscientists & Engineers.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Explicit use of the Biot coefficient in predicting shear-wave velocity of water-saturated sediments
Series title:
Geophysical Prospecting
DOI:
10.1111/j.1365-2478.2006.00524.x
Volume
54
Issue:
2
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
177
Last page:
185
Number of Pages:
9