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- W2191264682 abstract "We have conducted ultrasonic experiments, between 0.3 and 1 MHz, to measure velocity and attenuation ([Formula: see text]) anisotropy of P- and S-waves in dry Whitby Mudstone samples as a function of stress. We found the degree of anisotropy to be as large as 70% for velocity and attenuation. The sensitivity of P-wave anisotropy change with applied stress is more conspicuous than for S-waves. The closure of large aspect-ratio pores (and/or micro cracks) seems to be a dominant mechanism controlling the change of anisotropy. Generally, the highest attenuation is perceived for samples that have their bed layering perpendicular ([Formula: see text]) to the wave path. The observed attenuation in the samples is partly due to the scattering on the different layers, and it is partly due to the intrinsic attenuation. Changes in attenuation due to crack closure during the loading stage of the experiment are an indication of the intrinsic attenuation. The remaining attenuation can then be attributed to the layer scattering. Finally, the changes in attenuation anisotropy with applied stress are more dynamic with respect to changes in velocity anisotropy, supporting the validity of a higher sensitivity of attenuation to rock property changes." @default.
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- W2191264682 date "2016-01-01" @default.
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- W2191264682 title "Ultrasonic velocity and attenuation anisotropy of shales, Whitby, United Kingdom" @default.
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- W2191264682 doi "https://doi.org/10.1190/geo2015-0211.1" @default.
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