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• W2011478668 abstract "Granular structure and microcracks in rocks cause large nonlinearities in the constitutive relations that result in the stress dependence of acoustic‐wave velocities. The nonlinear constitutive relations of isotropic materials are described in terms of two linear and three nonlinear elastic constants. For nonhyperelastic materials such as rocks, these constants are defined in terms of strain derivatives of stresses for either the load or unload cycle. Acoustic waveforms at an array of receivers recorded at two different borehole pressures can be used to estimate two of the three formation nonlinear constants. Processing of these time waveforms produced by a monopole or dipole source yields the Stoneley or flexural dispersions, respectively. The differences in the Stoneley and flexural dispersions caused by a known change in the borehole pressure are then utilized in a multifrequency inversion model that yields two of the three independent nonlinear constants of the formation. These two nonlinear constants, c 144 and c 155 , are sufficient to calculate the difference between the maximum and minimum stresses in the azimuthal plane from the dipole anisotropy in the fast and slow shear‐wave velocities. In addition, these two formation nonlinear constants are also sufficient to estimate the stress derivatives, [Formula: see text] and [Formula: see text], for shear‐wave propagation normal to the uniaxial stress direction in a cylindrical rock sample of the same material as that of the in‐situ formation rock. Here ρ 0 is the formation mass density in the reference state; [Formula: see text] denotes plane‐wave velocity for propagation along the [Formula: see text]-direction and polarization along the [Formula: see text]-direction; and S is the uniaxial stress magnitude applied normal to the propagation direction. Generally, a positive derivative indicates that the rock sample would stiffen with increasing uniaxial stress and a negative derivative indicates that it would soften." @default.
• W2011478668 created "2016-06-24" @default.
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• W2011478668 date "1999-11-01" @default.
• W2011478668 modified "2023-09-23" @default.
• W2011478668 title "Formation nonlinear constants from sonic measurements at two borehole pressures" @default.
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• W2011478668 doi "https://doi.org/10.1190/1.1444695" @default.
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