基于频散曲线合成面波地震记录的方法
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摘要
准确提取频散曲线是瑞雷波勘探的重要环节,检验各种频散曲线求取方法的正确性和稳定性至关重要。基于频散曲线,选择抽样脉冲信号作为子波,推导出了合成单炮面波地震记录的理论公式,并利用该公式,针对不同弹性层状介质模型的频散曲线合成了面波地震记录。通过对其波场特征对比和频谱分析,同时采用频率-波数域法反求其频散曲线,结果与模型频散曲线几乎相同,从而充分验证了该面波合成方法的正确性。
Accurately calculating dispersion curve in Rayleigh wave exploration is an important step.It is vital to test the correctness and stability of various methods on calculating dispersion curve.This paper,based on disper-sion curve,derives the theory formula of synthesizing single shot surface-wave seismogram,which selects sam-pling pulse signal as a wavelet,and surface-wave seismograms for dispersion curves of several elastic layered me-dia are sythesised by the formula.It is sufficiently proved that the synthetic method is correct by wave field char-acteristic contrast,frequency spectrum analysis,and inversely calculated their dispersion curves by frequency-wave number analysis method,so this method provides a new theoretical principle and means to evaluate other methods of extracting dispersion curve.
Accurately calculating dispersion curve in Rayleigh wave exploration is an important step.It is vital to test the correctness and stability of various methods on calculating dispersion curve.This paper,based on disper-sion curve,derives the theory formula of synthesizing single shot surface-wave seismogram,which selects sam-pling pulse signal as a wavelet,and surface-wave seismograms for dispersion curves of several elastic layered me-dia are sythesised by the formula.It is sufficiently proved that the synthetic method is correct by wave field char-acteristic contrast,frequency spectrum analysis,and inversely calculated their dispersion curves by frequency-wave number analysis method,so this method provides a new theoretical principle and means to evaluate other methods of extracting dispersion curve.
引文
[1]杨成林.瑞雷波勘探[M].北京:地质出版社,1993
[2]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,2005,2(4):245-255.
[3]彭文,王亮.瑞雷面波频散特征的时频分析方法及应用[J].物探化探计算技术,2006,28(3):233-237.
[4]DONG-SOO KIM,HYUNG-CHOON P.Determination of dispersive phase velocities for SASW method using harmonic wavelet transform[J].Soil Dynamics and Earthquake Engineer-ing,2002,22:675-684.
[5]姜建国,曹建中,高玉明.信号与系统分析基础[M].北京:清华大学出版社,1994:85-91.
[6]杨天春,何继善,吕绍林,等.三层层状介质中瑞利波的频散曲线特征[J].物探与化探,2004,28(1):41-45.
[7]关小平,黄嘉正,周鸿秋.工程勘探中稳态瑞利面波法解释理论的探讨[J].地球物理学报,1993,36(1):96-105.
[8]张碧星,肖柏勋,杨文杰,等.瑞利波勘探中“之”字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):557-56.
[9]张碧星,鲁来玉,鲍光淑.瑞利面波勘探中“之”字形频散曲线研究[J].地球物理学报,2002,45(2):263-272.
[10]单娜琳,程志平.高阶模态面波在软弱薄层探测中的应用[J].桂林工学院学报,2004,24(2):155-157.
[2]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,2005,2(4):245-255.
[3]彭文,王亮.瑞雷面波频散特征的时频分析方法及应用[J].物探化探计算技术,2006,28(3):233-237.
[4]DONG-SOO KIM,HYUNG-CHOON P.Determination of dispersive phase velocities for SASW method using harmonic wavelet transform[J].Soil Dynamics and Earthquake Engineer-ing,2002,22:675-684.
[5]姜建国,曹建中,高玉明.信号与系统分析基础[M].北京:清华大学出版社,1994:85-91.
[6]杨天春,何继善,吕绍林,等.三层层状介质中瑞利波的频散曲线特征[J].物探与化探,2004,28(1):41-45.
[7]关小平,黄嘉正,周鸿秋.工程勘探中稳态瑞利面波法解释理论的探讨[J].地球物理学报,1993,36(1):96-105.
[8]张碧星,肖柏勋,杨文杰,等.瑞利波勘探中“之”字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):557-56.
[9]张碧星,鲁来玉,鲍光淑.瑞利面波勘探中“之”字形频散曲线研究[J].地球物理学报,2002,45(2):263-272.
[10]单娜琳,程志平.高阶模态面波在软弱薄层探测中的应用[J].桂林工学院学报,2004,24(2):155-157.
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