基于时频重排的地震信号Wigner-Ville分布时频分析
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摘要
在分析多种时频分析方法基础上,本文实现了一种基于时频重排算法的Wigner-Ville分布时频分析方法。即首先采用Gauss窗函数对Wigner-Ville分布进行时域和频域加窗平滑处理,再将能量的平均值按照区域能量的重心进行分配,重新安排信号在时频平面内的能量分布,这样可在抑制交叉项的同时保持好的时频聚集性。最后对川西拗陷须家河组气藏和黄骅拗陷火成岩油藏进行平滑伪Wigner-Ville分布时频分析,并与常规分析方法对比,结果表明平滑伪Wigner-Ville分布适用于地震信号的时频分析,并且更能突出时频的局部化特征和储层的微观结构,具有更好的时频分辨率。
Based on multiple time-frequency analyzing methods,the paper finished a time-frequency analysis method of Wigner-Ville distribution based on time-frequency rearrangement algorithm.Firstly,we use Gaussian window function to carry out smooth processing with window in time and frequency domain for Wigner-Ville distribution,then,distribute the average value of energy according to the barycenter of regional energy,rearranging the energy distribution of signal in time-frequency plane,thus keeping the time-frequency gather while suppressing the cross-terms,and finally implement the time-frequency analysis of smoothed pseudo Wigner-Ville distribution for Xujiahe gas reservoir in Chuanxi depression and igneous reservoir in Huanghua depression and make comparison with conventional analysis methods,which showed that the smoothed pseudo Wigner-Ville distribution is suitable for time-frequency analysis of seismic signal,and further highlights the local time-frequency feature and micro-structure of reservoir.
Based on multiple time-frequency analyzing methods,the paper finished a time-frequency analysis method of Wigner-Ville distribution based on time-frequency rearrangement algorithm.Firstly,we use Gaussian window function to carry out smooth processing with window in time and frequency domain for Wigner-Ville distribution,then,distribute the average value of energy according to the barycenter of regional energy,rearranging the energy distribution of signal in time-frequency plane,thus keeping the time-frequency gather while suppressing the cross-terms,and finally implement the time-frequency analysis of smoothed pseudo Wigner-Ville distribution for Xujiahe gas reservoir in Chuanxi depression and igneous reservoir in Huanghua depression and make comparison with conventional analysis methods,which showed that the smoothed pseudo Wigner-Ville distribution is suitable for time-frequency analysis of seismic signal,and further highlights the local time-frequency feature and micro-structure of reservoir.
引文
[1]Morlet J.Wave propagation and sampling theory.Ge-ophysics,1982,47(2):203～236
[2]Rauch-Davies M,Ralston M.Spectral decomposition-transform methods and fluid and reservoir prediction case study.67th EAGE Conference&Exhibition in-corporating SPE EUROPEC,Madrid,Spain,2005
[3]Rauch-Davies M,Ralston M.Variousexamplesofhowto use spectral decomposition for fluid separation.67th EAGE Conference&Exhibition incorporating SPE EUROPEC,Madrid,Spain,2005
[4]Auger F,Flandrin P.Improving the readability of time frequency and time-scale representations by the reassignment method.IEEE Trans signal process-ing,1995,43:1068～1089
[5]Djurovic I.A reassignment-based Method for Time-frequency Representation,Electronics Circuits and Systems.Proceedings of ICES′99,The6th IEEE In-ternational Conference,1999,(3):1357～1360
[6]Cohen L.Time-frequency analysis.PrenticeHall Inc,New York,USA,1995
[7]张贤达,保铮.非平稳信号分析与处理.北京:国防工业出版社,1998,46～68
[8]姜鸣,陈进,王慰军.几种Cohen类时频分布的比较及应用.机械工程学报,2003,39(8):129～134
[9]Jeong J,Williams WJ.Kernel Design for Reduced Interference Distribution.IEEE Trans SP,1992,40(2):402～412
[10]Stephane Mallat著;杨力华,戴道清译.信号处理的小波导引.北京:机械工业出版社,2002,80～90
[2]Rauch-Davies M,Ralston M.Spectral decomposition-transform methods and fluid and reservoir prediction case study.67th EAGE Conference&Exhibition in-corporating SPE EUROPEC,Madrid,Spain,2005
[3]Rauch-Davies M,Ralston M.Variousexamplesofhowto use spectral decomposition for fluid separation.67th EAGE Conference&Exhibition incorporating SPE EUROPEC,Madrid,Spain,2005
[4]Auger F,Flandrin P.Improving the readability of time frequency and time-scale representations by the reassignment method.IEEE Trans signal process-ing,1995,43:1068～1089
[5]Djurovic I.A reassignment-based Method for Time-frequency Representation,Electronics Circuits and Systems.Proceedings of ICES′99,The6th IEEE In-ternational Conference,1999,(3):1357～1360
[6]Cohen L.Time-frequency analysis.PrenticeHall Inc,New York,USA,1995
[7]张贤达,保铮.非平稳信号分析与处理.北京:国防工业出版社,1998,46～68
[8]姜鸣,陈进,王慰军.几种Cohen类时频分布的比较及应用.机械工程学报,2003,39(8):129～134
[9]Jeong J,Williams WJ.Kernel Design for Reduced Interference Distribution.IEEE Trans SP,1992,40(2):402～412
[10]Stephane Mallat著;杨力华,戴道清译.信号处理的小波导引.北京:机械工业出版社,2002,80～90
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