基于多模态分离的面波谱分析方法

张大洲; 顾汉明; 熊章强; 肖金红

基于多模态分离的面波谱分析方法

张大洲^{1, 2,},
顾汉明^{1, 2},
熊章强³,
肖金红⁴

1.
中国地质大学地球物理与空间信息学院, 湖北武汉 430074
2.
中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074
3.
中南大学信息物理工程学院, 湖南长沙 410083
4.
中南大学信息科学与工程学院, 湖南长沙 410083

基金项目:

国家重点基础研究发展计划(973计划) “南海深水区复杂地质结构地震采集基础理论研究 2009CB219403

详细信息

作者简介:
张大洲（1979—）男博士研究生主要从事面波勘探及地震偏移成像研究．E-mail：dazhou2005@163.com

中图分类号: P631
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出版历程
- 收稿日期: 2008-11-20
- 刊出日期: 2009-11-25

Spectrum Analysis of Surface Wave Method Based on Multi-Mode Separation

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
School of Info-Physics and Geomatics Engineering, Central South University, Changsha 410083, China
4.
College of Information Science and Engineering, Central South University, Changsha 410083, China

摘要

摘要: 面波频谱分析法(SASW) 作为一种横向分辨率较高的瑞雷面波勘探方法, 由于计算得到的基阶面波频散曲线存在较大误差以及无法获得高阶模式频散曲线而在应用中受到限制.通过应用Fourier变换方法(FT法) 分离提取面波各模态数据, 进而对分离后的各模态数据利用SASW法计算频散曲线.通过模型实例分析得出: (1) 利用SASW计算基阶面波频散曲线时必须分离得到基阶面波数据, 然后计算才能得到正确的结果; (2) 基于多模态分离的SASW法可以计算得到面波高阶模式的频散曲线.
- 瑞雷面波 /
- Fourier变换 /
- SASW法 /
- 高阶模式 /
- 地震勘探
Abstract: Spectrum analysis of surface wave (SASW) is one of the Rayleigh wave exploration methods with higher lateral resolution. Presently, there is a large error in calculating fundamental mode dispersion curve of the Rayleigh wave and the dispersion curve of the higher mode can't be calculated by the SASW method. As a result, it is limited in its application. In this paper, different modes of Rayleigh wave are separated and extracted by Fourier transform (FT method), and then, the dispersion curve will be calculated by the SASW method using the Rayleigh wave data after the separation. According to the analysis of examples, it can be concluded that: (1) when using the SASW method to calculate the fundamental mode dispersion curve, the Rayleigh wave data of fundamental mode should be separated first, and then calculated. Or else, the fundamental mode dispersion curve couldn't be right; (2) it can get higher mode dispersion curve by the SASW method based on multi-mode separation.
- Rayleigh wave /
- Fourier transform /
- SASW method /
- higher mode /
- seismic prospecting

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图 1 2层介质模型合成地震记录(垂直分量)

Fig. 1. Synthetic data (vertical-component) due to a two layer model

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图 2 合成地震记录的频率-波数谱

Fig. 2. Frequency wave-number spectrum of synthetic data

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图 3 3种方法计算得到的频散曲线对比

Fig. 3. Comparison of three kind of dispersion curve

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图 4 FT法提取得到的面波记录及与理论值对比的频散曲线

a.基阶面波记录; b.基阶面波频散曲线; c.一阶高模式面波记录; d.一阶高模式面波频散曲线; e.二阶高模式面波记录; f.二阶高模式面波频散曲线

Fig. 4. Record and dispersion curve of surface wave extracted by FT method

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图 5 SASW法计算得到频散曲线与理论值对比

a.原始面波数据频散曲线; b.基阶面波频散曲线; c.一阶高模式频散曲线; d.二阶高模式面波频散曲线

Fig. 5. Comparison of dispersion curve of surface wave between SASW and analytical results

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图 6 SASW法计算基阶和高模式面波频散曲线与理论值对比

Fig. 6. Comparison of dispersion curve of fundamental and higher mode surface wave between SASW and analytical results

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图 7 倾斜界面模型(a)及其垂直分量合成地震记录(b)

Fig. 7. Slant interface model (a) and synthetic data of its vertical-component (b)

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图 8 相移法计算得到的频散曲线(a)和面波分离后SASW法计算得到的相速度速度剖面(b)

Fig. 8. Dispersion curve calculated by phase shift method (a) and Phase velocity profile of calculated by SASW method using separated data (b)

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