Comparison of P‐wave attenuation models of wave‐induced flow |
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| Authors: | Weitao Sun Tobias M Müller José M Carcione Hong Cao |
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| Affiliation: | 1. Zhou Pei‐Yuan Center for Applied Mathematics, Tsinghua University, Beijing, China;2. CSIRO Energy Flagship, Kensington, WA, Australia;3. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy;4. Geophysical Department, Beijing, China |
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| Abstract: | Wave‐induced oscillatory fluid flow in the vicinity of inclusions embedded in porous rocks is one of the main causes for P‐wave dispersion and attenuation at seismic frequencies. Hence, the P‐wave velocity depends on wave frequency, porosity, saturation, and other rock parameters. Several analytical models quantify this wave‐induced flow attenuation and result in characteristic velocity–saturation relations. Here, we compare some of these models by analyzing their low‐ and high‐frequency asymptotic behaviours and by applying them to measured velocity–saturation relations. Specifically, the Biot–Rayleigh model considering spherical inclusions embedded in an isotropic rock matrix is compared with White's and Johnson's models of patchy saturation. The modeling of laboratory data for tight sandstone and limestone indicates that, by selecting appropriate inclusion size, the Biot‐Rayleigh predictions are close to the measured values, particularly for intermediate and high water saturations. |
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| Keywords: | P‐wave dispersion/attenuation Double porosity Biot– Rayleigh theory Local fluid flow Patchy saturation |
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