地震信号可变分辨率匹配追踪频谱成像方法
|
摘要
基于传统的Morlet时频原子库的匹配追踪时频表征方法存在时频分辨率不可调的缺点,解决实际问题的能力受到限制。通过引入分辨率调节参数,使Morlet小波的时频分辨率灵活可控,在此基础上提出了可变分辨率的匹配追踪时频表征方法,实现时间分辨率和频率分辨率分别可调的目的。在薄层频谱成像中,利用可变分辨率匹配追踪时频表征方法来提高匹配追踪时频分布的时间分辨率,可以有效避免复杂地质背景的干扰,实现薄储层的清晰成像。
Matching pursuit time-frequency characterization method based on traditional Morlet time-frequency atoms dictionary cannot adjust the time-frequency resolution,which limits the application on actual data.In order to solve the problem,we introduced resolution adjustment parameter to make the time-frequency resolution of Morlet wavelet flexible and controllable.On this basis,the variable resolution matching pursuit time-frequency characterization method was developed to realize adjustable for time resolution and frequency resolution.In the spectrum imaging of thin reservoir,our method was used to enhance the time resolution of matching pursuit time-frequency distribution,which can effectively avoid the interference of complex geological background and achieve a clear image of thin reservoir.
Matching pursuit time-frequency characterization method based on traditional Morlet time-frequency atoms dictionary cannot adjust the time-frequency resolution,which limits the application on actual data.In order to solve the problem,we introduced resolution adjustment parameter to make the time-frequency resolution of Morlet wavelet flexible and controllable.On this basis,the variable resolution matching pursuit time-frequency characterization method was developed to realize adjustable for time resolution and frequency resolution.In the spectrum imaging of thin reservoir,our method was used to enhance the time resolution of matching pursuit time-frequency distribution,which can effectively avoid the interference of complex geological background and achieve a clear image of thin reservoir.
引文
[1]Chakraborty A,Okaya D.Frequency-time decompo-sition of seismic data using wavelet-based methods[J].Geophysics,1995,60(6):1906-1916
[2]Castagna J P,Sun S J.Comparison of spectral de-composition methods[J].First Break,2006,24(3):75-79
[3]Liu J,Marfurt K J.Matching pursuit decompositionusing Morlet wavelets[J].Expanded Abstracts of75th Annual Internat SEG Mtg,2005,786-789
[4]Wang Y.Seismic time-frequency spectral decomposi-tion by matching pursuit[J].Geophysics,2007,72(1):13-20
[5]Castagna J P,Sun S J.Instantaneous spectral analy-sis:Detection of low-frequency shadows associatedwith hydrocarbons[J].The Leading Edge,2003,22(2):120-127
[6]Liu J,Marfurt K J.Instantaneous spectral attributesto detect channels[J].Geophysics,2007,72(2):23-31
[7]Charles I P,Sheng H T.Comparison of frequencyattributes from CWT and MPD spectral decomposi-tions of a complex turbidite channel model[J].Ex-panded Abstracts of 78th Annual Internat SEG Mtg,2008,393-397
[8]Mallat S,Zhang Z.Matching pursuit with time-fre-quency dictionaries[J].IEEE transactions on signalprocessing,1993,41(12):3397-3415
[9]张繁昌,李传辉,印兴耀.基于动态匹配子波库的地震数据快速匹配追踪算法[J].石油地球物理勘探,2010,45(5):667-673Zhang F C,Li C H,Yin X Y.Seismic data fast matc-hing pursuit based on dynamic matching wavelet li-brary[J].Oil Geophysical Prospecting,2010,45(5):667-673
[10]陈发宇,杨长春.对依据频率的匹配追踪快速算法的改进[J].石油物探,2009,48(1):80-83Chen F Y,Yang C C.An improvement for frequen-cy-dominated fast matching pursuits algorithm[J].Geophysical Prospecting for Petroleum,2009,48(1):80-83
[11]张繁昌,李传辉.非平稳地震信号匹配追踪时频分析[J].物探与化探,2011,35(4):546-552Zhang F C,Li C H.Matching pursuit time-frequencyanalysis of non-stationary seismic signals[J].Geo-physical and Geochemical Exploration,2011,35(4):546-552
[12]Cohen L.Time-frequency analysis[M].New York,USA:Prentice Hall,1995:40-42
[13]Morlet J,Arens G,Fourgeau E.Wave propagationand sampling theory-Part II:sampling theory andcomplex waves[J].Geophysics,1982,47(2):222-236
[2]Castagna J P,Sun S J.Comparison of spectral de-composition methods[J].First Break,2006,24(3):75-79
[3]Liu J,Marfurt K J.Matching pursuit decompositionusing Morlet wavelets[J].Expanded Abstracts of75th Annual Internat SEG Mtg,2005,786-789
[4]Wang Y.Seismic time-frequency spectral decomposi-tion by matching pursuit[J].Geophysics,2007,72(1):13-20
[5]Castagna J P,Sun S J.Instantaneous spectral analy-sis:Detection of low-frequency shadows associatedwith hydrocarbons[J].The Leading Edge,2003,22(2):120-127
[6]Liu J,Marfurt K J.Instantaneous spectral attributesto detect channels[J].Geophysics,2007,72(2):23-31
[7]Charles I P,Sheng H T.Comparison of frequencyattributes from CWT and MPD spectral decomposi-tions of a complex turbidite channel model[J].Ex-panded Abstracts of 78th Annual Internat SEG Mtg,2008,393-397
[8]Mallat S,Zhang Z.Matching pursuit with time-fre-quency dictionaries[J].IEEE transactions on signalprocessing,1993,41(12):3397-3415
[9]张繁昌,李传辉,印兴耀.基于动态匹配子波库的地震数据快速匹配追踪算法[J].石油地球物理勘探,2010,45(5):667-673Zhang F C,Li C H,Yin X Y.Seismic data fast matc-hing pursuit based on dynamic matching wavelet li-brary[J].Oil Geophysical Prospecting,2010,45(5):667-673
[10]陈发宇,杨长春.对依据频率的匹配追踪快速算法的改进[J].石油物探,2009,48(1):80-83Chen F Y,Yang C C.An improvement for frequen-cy-dominated fast matching pursuits algorithm[J].Geophysical Prospecting for Petroleum,2009,48(1):80-83
[11]张繁昌,李传辉.非平稳地震信号匹配追踪时频分析[J].物探与化探,2011,35(4):546-552Zhang F C,Li C H.Matching pursuit time-frequencyanalysis of non-stationary seismic signals[J].Geo-physical and Geochemical Exploration,2011,35(4):546-552
[12]Cohen L.Time-frequency analysis[M].New York,USA:Prentice Hall,1995:40-42
[13]Morlet J,Arens G,Fourgeau E.Wave propagationand sampling theory-Part II:sampling theory andcomplex waves[J].Geophysics,1982,47(2):222-236
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心