Abstract
Biot model estimates of absorption are particularly sensitive to porosity and to the frame moduli. In previous work [P. R. Ogushwitz, J. Acoust. Soc. Am. 77, 429–464 (1985)], the frame moduli from a self‐consistent theory of composites (SCT) was estimated, and an empirical factor (the “contact factor”) that scales the SCT estimates in order to match measured wave speeds was determined. It is shown that the contact factor is related to grain packing and cementation. Here, it is first shown that Biot model estimates of sound speed versus depth do agree with measurements in Gulf Coast brine sands [G. H. F. Gardner et al., Geophysics 39, 770–780 (1974)], where the SCT estimates have been scaled by the appropriate contact factor. Second, it is shown that the corresponding Biot estimates of absorption versus depth are within the range of measured absorption values, that they exhibit a maximum at 1750‐m depth, and that the behavior of this maximum is consistent with other published measurements and theories. Thi...
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