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A finite-difference time-domain ͑FDTD͒ formulation with perfectly matched layer ͑PML͒ enables analysis of elastic-wave propagation in a fluid-filled borehole in an arbitrarily anisotropic formation. The FDTD formulation yields synthetic waveforms at an array of receivers produced by a monopole or dipole source placed on the borehole axis. Synthetic(More)
This paper presents a perturbation model to obtain flexural mode dispersions of noncircular fluid-filled boreholes in homogeneous elastic formations. The perturbation model is based on Hamilton's principle with a modified procedure for the reference state selection in order to handle the directional sensitivity of the flexural modes. The accuracy of the(More)
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