| Perturbation Analysis on Guided Waves in a Fluid-Filled Borehole Surrounded by a Cubic Crystal Anisotropic Medium |
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| 作者姓名： | 张丽 张碧星 王克协 |
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| 作者单位： | [1]School of Physics, Jilin University, Changchun 130021 [2]Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 |
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| 基金项目： | Supported by the National Nature Science Foundation of China under Grant Nos 40674059 and 10534040, and the Doctoral Programme of Higher Education of China under Grant No 20040183045. |
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| 摘 要： | 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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| 关 键 词： | 干扰 波导波 流体 非均质介质 |
| 收稿时间： | 2007-07-25 |
Perturbation Analysis on Guided Waves in a Fluid-Filled Borehole Surrounded by a Cubic Crystal Anisotropic Medium |
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| ZHANG Li,ZHANG Bi-Xing,WANG Ke-Xie.Perturbation Analysis on Guided Waves in a Fluid-Filled Borehole Surrounded by a Cubic Crystal Anisotropic Medium[J].Chinese Physics Letters,2007,24(11):3179-3182. |
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| Authors: | ZHANG Li ZHANG Bi-Xing WANG Ke-Xie |
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| Institution: | School of Physics, Jilin University, Changchun 130021Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 |
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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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