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Perturbation Analysis on Guided Waves in a Fluid-Filled Borehole Surrounded by a Cubic Crystal Anisotropic Medium |
| ZHANG Li1;ZHANG Bi-Xing2;WANG Ke-Xie1 |
| 1School of Physics, Jilin University, Changchun 1300212Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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ZHANG Li, ZHANG Bi-Xing, WANG Ke-Xie 2007 Chin. Phys. Lett. 24 3179-3182 |
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Abstract The perturbation method is employed to analyse 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 characteristics of Stoneley wave, pseudo-Rayleigh wave, flexural wave, and screw wave are 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, whereas the dispersion of screw wave excited by quadrupole source is significantly related to the azimuth of the source. Screw waves propagated along different azimuth in the borehole can be split. This is different from screw waves in transversely isotropic media (hexagonal crystal), which have been widely studied.
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| Keywords:
43.35.+d
43.20.+g
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Received: 25 July 2007
Published: 23 October 2007
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| PACS: |
43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.20.+g
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(General linear acoustics)
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