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Wave Dispersion and Attenuation in Partially Saturated Sandstones |
| NIE Jian-Xin1;YANG Ding-Hui2;YANG Hui-Zhu1 |
| 1Department of Engineering Mechanics, Tsinghua University, Beijing 100084
2Department of Mathematical Sciences, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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NIE Jian-Xin, YANG Ding-Hui, YANG Hui-Zhu 2004 Chin. Phys. Lett. 21 572-575 |
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Abstract We investigate the wave dispersion and attenuation in partially water-saturated sandstones based on the improved Biot/squirt (BISQ) model in which the saturation is introduced. Numerical experiments indicate that the phase velocity of the fast P-wave decreases as the saturation increases in the low-frequency range (102-104 Hz), and reaches the minimum at the full-saturation state. The behaviour of the phase velocity varying with the saturation in the high-frequency range (104-106 Hz), however, is opposite to that in the low-frequency range. The peak value of P-wave attenuation increases with increasing saturation, and is the maximum at the fully saturated state. Numerical models and experiments show that the improved BISQ model is better than the traditional Gassmann-Biot model.
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91.60.Lj
43.20.Jr
91.30.Vc
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Published: 01 March 2004
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| PACS: |
91.60.Lj
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(Acoustic properties)
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43.20.Jr
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(Velocity and attenuation of elastic and poroelastic waves)
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91.30.Vc
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(Continental crust seismology)
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