| 基于散度和旋度纵横波分离方法的改进 |
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| 引用本文： | 李志远,梁光河,谷丙洛.基于散度和旋度纵横波分离方法的改进[J].地球物理学报,2013,56(6):2012-2022. |
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| 作者姓名： | 李志远 梁光河 谷丙洛 |
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| 作者单位： | 1. 中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所, 北京 100029;
2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家重大科研装备研制项目 |
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| 摘 要： | 纵、横波的分离是多波多分量地震资料处理中很重要的一步,其分离结果直接影响到后续数据处理的质量.各向同性介质中纵波为无旋场,横波为无散场,因此可以在频率-波数域利用散度和旋度算子对地震记录进行纵、横波分离,但是此处理过程必须知道地表处的纵、横波速度.本文给出了一种估算地表纵、横波速度的方法,可以在纵、横波速度值未知的情况下,将其估算出来.针对弹性波场进行散度和旋度运算时,纵、横波的相位和振幅比发生改变的问题,本文给出了相位和纵、横波振幅比的校正方法.
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| 关 键 词： | 纵横波分离 散度和旋度 频率波数域 波速 相位 纵横波振幅比 |
| 收稿时间： | 2012-06-08 |
Improved method of separating P-and S-waves using divergence and curl |
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| LI Zhi-Yuan
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LIANG Guang-He
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GU Bing-Luo.Improved method of separating P-and S-waves using divergence and curl[J].Chinese Journal of Geophysics,2013,56(6):2012-2022. |
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| Authors: | LI Zhi-Yuan LIANG Guang-He GU Bing-Luo |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The separation of P- and S-wavefields from multi-component seismic data is very important, which has a direct impact on the follow-up data processing. In isotropic media, P-wavefield is curl-free and S-wavefield is divergence-free, so the P- and S-wavefields can be separated by taking the divergence and curl in frequency-wavenumber domain. However, only when the surface P velocity and S velocity are known, the P- and S-waves will be separated. In the paper, a method of estimating surface P velocity and S velocity is developed, which can obtain the surface velocities, even if they are unknown. A method for correcting phase and amplitude ratio of P-wave and S-wave is also presented, which solves the problem that the phase and amplitude ratios of P-wave and S-wave are changed after taking the divergence and curl. |
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| Keywords: | The separation of P-and S-wavefields Curl and divergence Frequency-and wavenumber-domain Wave velocity Phase Amplitude ratio of P-wave and S-wave |
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