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A simple method of predicting S-wave velocity

Geophysics

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DOI: 10.1190/1.2357833

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Abstract

Prediction of shear-wave velocity plays an important role in seismic modeling, amplitude analysis with offset, and other exploration applications. This paper presents a method for predicting S-wave velocity from the P-wave velocity on the basis of the moduli of dry rock. Elastic velocities of water-saturated sediments at low frequencies can be predicted from the moduli of dry rock by using Gassmann's equation; hence, if the moduli of dry rock can be estimated from P-wave velocities, then S-wave velocities easily can be predicted from the moduli. Dry rock bulk modulus can be related to the shear modulus through a compaction constant. The numerical results indicate that the predicted S-wave velocities for consolidated and unconsolidated sediments agree well with measured velocities if differential pressure is greater than approximately 5 MPa. An advantage of this method is that there are no adjustable parameters to be chosen, such as the pore-aspect ratios required in some other methods. The predicted S-wave velocity depends only on the measured P-wave velocity and porosity. ?? 2006 Society of Exploration Geophysicists.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A simple method of predicting S-wave velocity
Series title:
Geophysics
DOI:
10.1190/1.2357833
Volume
71
Issue:
6
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article