Abstract
Anisotropy of the formation surrounding a borehole might be caused by intrinsic characteristics (bedding, mineral orientation, etc.) or the effect of stresses on fractures. In this study, we make monopole and dipole logging measurements in a borehole drilled in an anisotropic rock block. Then we apply uniaxial horizontal stresses parallel and perpendicular to anisotropy symmetry axes and measure velocities with the same logging systems. The experimental results show that the fast and slow shear velocities measured depend on both intrinsic anisotropy and stress-induced anisotropy. A combination of P and S wave velocities obtained from monopole logs and shear velocities obtained from flexural wave recorded by dipole logs can be used to determine intrinsic anisotropy and direction of maximum horizontal stresses.
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