提高微地震资料信噪比的频率域极化滤波
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摘要
微地震资料信噪比低、波场复杂,利用常规极化滤波难以取得比较理想的效果。在时间域与频率域极化滤波方法的基础上,针对利用傅里叶变换的频率域极化滤波存在频谱泄漏等问题,引入多阶窗函数,消除了常规方法构造谱密度矩阵中奇异值的影响,同时考虑多道信号的空间连续性对频率域滤波方法进行改进。模型和实际资料处理的结果表明,该方法能有效提高微地震资料的信噪比。
Microseismic data is characterized by low S/N and complex wavefield,and conventional polarization filtering cannot achieve ideal results.In order to solve the spectral leakage problem existing in the polarization filtering in frequency domain by using FFT,on basis of polarization filtering in frequency domain and time domain, multi-order window function was introduced,which eliminated the impact of singular value of spectral density matrix constructed by conventional method.Meanwhile,the filtering method in frequency domain was improved by considering the spatial continuity of multitrace signals.Modeling testing and actual data processing results indicate that the method can obtain relatively effectively improve the S/N of microseismic data.
Microseismic data is characterized by low S/N and complex wavefield,and conventional polarization filtering cannot achieve ideal results.In order to solve the spectral leakage problem existing in the polarization filtering in frequency domain by using FFT,on basis of polarization filtering in frequency domain and time domain, multi-order window function was introduced,which eliminated the impact of singular value of spectral density matrix constructed by conventional method.Meanwhile,the filtering method in frequency domain was improved by considering the spatial continuity of multitrace signals.Modeling testing and actual data processing results indicate that the method can obtain relatively effectively improve the S/N of microseismic data.
引文
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[9]詹正彬,姚姚.多波及横波地震勘探[M].北京:地质出版社,1994:63-76
[10]葛勇,韩立国,韩文明.极化分析研究及其在波场分离中的应用[J].长春地质学院学报,1996,26(1): 83-88
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[12]Diallo M S,Kulish M,Holschneider M,et al.Instantaneous polarizaion attributes based on an adaptive approximate covariance method[J].Geophysics, 2006,71(5):99-104
[13]陈赟,高乐,赵烽帆.一种基于频率域偏振分析提高三分量地震资料信噪比的方法[J].地球物理学进展,2007,22(1):255-261
[14]Jeffrey P.Multitaper spectral analysis of high-frequency seismogram[J].Journal of Geophysical Research, 1987,92(12B):12675-12684
[2]加尔彼林,著.地震勘探偏振法[M].何樵登,杨宝俊,译.北京:石油工业出版社,1989:50-58
[3]赵鸿儒,孙进忠,唐文榜,等.全波震相分析[M].北京:地震出版社,1991:172-184
[4]吴律.层析基础及其在井间地震中的应用[M].北京:石油工业出版社,1997:237-269
[5]朱光明.垂直地震剖面法[M].北京:石油工业出版社,1988:64 117
[6]宋维琪,孙英杰,朱卫星.微地震资料频域相干时??间域偏振滤波方法[J].石油地球物理勘探,2008,43 (2):161-167
[7]Samson J C,Olson J V.Data-adaptive polarization filters for multichannel geophysical data[J].Geophysics, 1981,46(10):1423-1431
[8]Du Z J,Foulger G R,Mao W J.Noise reduction for broad-band,three-component seismograms using data -adaptive polarization filters[J].Geophysical Journal International,2000,141(3):820-828
[9]詹正彬,姚姚.多波及横波地震勘探[M].北京:地质出版社,1994:63-76
[10]葛勇,韩立国,韩文明.极化分析研究及其在波场分离中的应用[J].长春地质学院学报,1996,26(1): 83-88
[11]黄中玉,高林,徐亦鸣,等.三分量数据的偏振分析及应用[J].石油物探,1996,35(2):9-16
[12]Diallo M S,Kulish M,Holschneider M,et al.Instantaneous polarizaion attributes based on an adaptive approximate covariance method[J].Geophysics, 2006,71(5):99-104
[13]陈赟,高乐,赵烽帆.一种基于频率域偏振分析提高三分量地震资料信噪比的方法[J].地球物理学进展,2007,22(1):255-261
[14]Jeffrey P.Multitaper spectral analysis of high-frequency seismogram[J].Journal of Geophysical Research, 1987,92(12B):12675-12684
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