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- W2016033123 abstract "ABSTRACT Certain crack‐influence parameters of Sayers and Kachanov are shown to be directly related to Thomsen's weak‐anisotropy seismic parameters for fractured reservoirs when the crack/fracture density is small enough. These results are then applied to the problem of seismic wave propagation in polar reservoirs, i.e., those anisotropic reservoirs having two axes that are equivalent but distinct from the third axis), especially for horizontal transversely isotropic seismic wave symmetry due to the presence of aligned vertical fractures and resulting in azimuthal seismic wave symmetry at the Earth's surface. The approach presented suggests one method of inverting for fracture density from wave speed data. A significant fraction of the technical effort in the paper is devoted to showing how to predict the angular location of the true peak (or trough) of the quasi‐SV‐wave for polar media and especially how this peak is related to another angle that is very easy to compute. The axis of symmetry is always treated here as the x 3 ‐axis for either vertical transversely isotropic symmetry (due, for example, to horizontal cracks), or horizontal transversely isotropic symmetry (due to aligned vertical cracks). Then, the meaning of the stiffnesses is derived from the fracture analysis in the same way for vertical transversely isotropic and horizontal transversely isotropic media, but for horizontal transverse isotropy the wave speeds relative to the Earth's surface are shifted by 90 o in the plane perpendicular to the aligned vertical fractures. Skempton's poroelastic coefficient B is used as a general means of quantifying the effects of fluids inside the fractures. Explicit Biot‐Gassmann‐consistent formulas for Thomsen's parameters are also obtained for either drained or undrained fractures resulting in either vertical transversely isotropic or horizontal transversely isotropic symmetry of the reservoir." @default.
- W2016033123 created "2016-06-24" @default.
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- W2016033123 date "2009-02-19" @default.
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- W2016033123 title "Aligned vertical fractures, HTI reservoir symmetry and Thomsen seismic anisotropy parameters for polar media" @default.
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- W2016033123 doi "https://doi.org/10.1111/j.1365-2478.2008.00767.x" @default.
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