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1. Perturbation analysis on multipole guided waves in a fluid-filled borehole surrounded by a cubic crystal anisotropic medium | |||
Zhang Li,Wang Kexie | |||
Earth Science 10 September 2007 | |||
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Abstract:The guided waves excited by multipole source in a fluid-filled borehole surrounded by a cubic crystallographic anisotropic medium are studied by the perturbation method. The borehole-medium model has no axial symmetry and the acoustic fields inside and outside the borehole can not be studied analytically. In this Letter, the perturbation method is adopted to analyze the guided waves in a borehole surrounded by a cubic crystal medium for the first time. The cubic crystal medium is regarded as a reference unperturbed isotropic state added to the perturbation. The dispersion characteristic of Stoneley wave, Pseodu-Rayleigh wave, flexural wave, and screw wave is investigated in detail. It is found that dispersion of the guided waves excited by monopole and dipole sources does not depend on the azimuth of the source but the dispersion of screw wave excited by quadrupole source has a significant relation to the azimuth of the source. It shows that screw waves propagated along different azimuth in the borehole can be split. This is different from that in transversely isotropic medium (hexagonal crystal) which has been studied widely. | |||
TO cite this article:Zhang Li,Wang Kexie. Perturbation analysis on multipole guided waves in a fluid-filled borehole surrounded by a cubic crystal anisotropic medium [OL].[10 September 2007] http://en.paper.edu.cn/en_releasepaper/content/14970 |
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