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Shear wave attenuation in dry and saturated sandstone at seismic to ultrasonic frequencies



Shear wave attenuation in dry and saturated sandstone at seismic to ultrasonic frequencies



International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 30(7): 755-761



Ultrasonic and forced-oscillation methods have been applied to measure shear attenuation in Berea sandstone and a fused glass bead sample in the frequency ranges of .03 to 100 Hz and 600 to 1000 kHz. The Qs of dry Berea sandstone at atmospheric pressure falls in the range 100 to 150 for frequencies between .03 Hz and 20 Hz. The ultrasonic results show a much lower QS (<100) and a strong effect of complete fluid saturation. In the dry Berea samples, QS is most strongly influenced by frequency at the highest confining pressure of 70 MPa. In all cases, ultrasonic shear Q decreases with increasing frequency. Fluid-flow mechanisms are indicated as the responsible loss mechanisms, both in the saturated samples and in the humid (room-dry) samples.

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Accession: 020008578

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DOI: 10.1016/0148-9062(93)90019-a


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