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In situ formation stress directions and magnitudes are estimated by inverting the borehole flexural and Stoneley dispersions obtained from standard acoustic logging data (dipole and monopole logs). The underlying procedure consists of the following steps: first, we locate stressed zones in the formation by searching for crossovers in flexural dispersions. Second, the fast shear direction is estimated from the cross-dipole waveforms. It corresponds to the direction of the maximum horizontal stress (SH). Finally, a multi-frequency inversion of both the Stoneley and flexural dispersions yields the maximum (SH) and minimum (Sh) horizontal stress magnitudes together with the three formation nonlinear elastic constants, Cnb Cn2 and C123, defined about the selected reference (isotropic) state. The inversion method is based on equations that relate SH and Sh with variations in phase velocities of the borehole flexural and Stoneley waves

Formation stress estimation using standard acoustic logging