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- W2170832205 abstract "Fractured rock is often modelled under the assumption of perfect fluid pressure equalization between the fractures and equant porosity. This is consistent with laboratory estimates of the characteristic squirt-flow frequency. However, these laboratory measurements are carried out on rock samples which do not contain large fractures. We consider coupled fluid motion on two scales: the grain scale which controls behaviour in laboratory experiments and the fracture scale. Our approach reproduces generally accepted results in the low- and high-frequency limits. Even under the assumption of a high squirt-flow frequency, we find that frequency-dependent anisotropy can occur in the seismic frequency band when larger fractures are present. Shear-wave splitting becomes dependent on frequency, with the size of the fractures playing a controlling role in the relationship. Strong anisotropic attenuation can occur in the seismic frequency band. The magnitude of the frequency dependence is influenced strongly by the extent of equant porosity. With these results, it becomes possible in principle to distinguish between fracture- and microcrack-induced anisotropy, or more ambitiously to measure a characteristic fracture length from seismic data." @default.
- W2170832205 created "2016-06-24" @default.
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- W2170832205 date "2003-08-22" @default.
- W2170832205 modified "2023-09-25" @default.
- W2170832205 title "Frequency-dependent anisotropy due to meso-scale fractures in the presence of equant porosity" @default.
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- W2170832205 doi "https://doi.org/10.1046/j.1365-2478.2003.00384.x" @default.
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