基于F-K变换的井下多道瑞利波频散曲线提取
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摘要
井下瑞利波勘探中频散曲线的提取多采用基于两道之间互相关的表面波谱分析法,此方法仅能提取基阶模式的瑞利波频散曲线。为了能够获得多阶模式频散曲线,提高煤矿井下瑞利波勘探的探测距离和精度,运用基于F-K变换的多道瑞利波频散曲线提取方法处理井下地震数据。针对井下地震数据的特点对方法进行了改进,在利用合成数据验证方法的有效性后,将其应用于工作面内部构造探测中,并从中获取了具有多阶模式的瑞利波频散曲线,从而证实了当煤层中存在断层时多阶模式瑞利波的存在。
Rayleigh wave exploration is one of the main methods of seismic exploration in underground coal mines.However,the traditional way of dispersion curves extraction is the spectral analysis surface wave method based on the correlation of traces.This method can only extract the basic mode of Rayleigh wave.For the purpose of getting multimode dispersion curves and extending the range of exploration,we improved the F-K transform based dispersive curve generation method and applied it on actual seismic data in underground coal mine.After verification by synthetic data,we used the method in the detection of structure in working face and acquired the multimode dispersion curves.This work confirmed the existence of multimode Rayleigh wave when faults exist in coal seam.
Rayleigh wave exploration is one of the main methods of seismic exploration in underground coal mines.However,the traditional way of dispersion curves extraction is the spectral analysis surface wave method based on the correlation of traces.This method can only extract the basic mode of Rayleigh wave.For the purpose of getting multimode dispersion curves and extending the range of exploration,we improved the F-K transform based dispersive curve generation method and applied it on actual seismic data in underground coal mine.After verification by synthetic data,we used the method in the detection of structure in working face and acquired the multimode dispersion curves.This work confirmed the existence of multimode Rayleigh wave when faults exist in coal seam.
引文
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[2]从皖平,张鹏,王继矿.多道瑞利波在矿井独头巷道超前探中的应用[J].煤田地质与勘探,2008,36(4):67–69.
[3]王小波,王勇.影响瑞利波在矿井中探测精度的因素[J].煤田地质与勘探,2009,37(1):72–74.
[4]肖柏勋,李长征.瑞利面波勘探技术研究述评[J].工程地球物理学报,2004,1(1):38–47.
[5]罗银河,夏江海,刘江平,等.基阶与高阶瑞利波联合反演研究[J].地球物理学报,2005,2(4):242–249.
[6]张碧星,鲁来玉.用频率波数法分析瑞利波频散曲线[J].工程地球物理学报,2000,43(4):245–255.
[7]肖柏勋,杨文杰.瑞利波勘探中“之”形频散曲线的形成机理及反演研究[J].地球物理学报,2000,43(4):557–567.
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