S变换和TT变换联合压制地震面波
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摘要
TT变换(Time-Time transform)是基于S变换的一种新的非平稳信号处理方法,具有很好的频率聚集能力。面波的频率比反射波的频率低,通过提取TT变换域的对角线元素,就可以压制低频面波。但该方法的不足是在压制低频的同时,也保留了部份高频干扰,这些高频干扰可以用S变换来消除。首先对每一道地震数据进行S变换时频滤波,把高频干扰和随机噪音压制掉,接着做TT滤波,来压制低频的面波。通过实际地震数据处理,并与传统的高通滤波方法进行对比,充分显示了S变换和TT变换联合压制面波的有效性。
TT transformation (Time-Time transformation) is a new method to process non-stationary signal based on S-transform,it has a good ability of frequency conversion.The surface wave,with lower frequency compared with other seismic wave,can be suppressed through extracting the TT spectrum's diagonal elements of seismic data.However,this method has a deficiency that in pressing low-frequency signal,a part of high-frequency interference is retained that can be eliminated by S transformation.Firstly,we apply S transform time-frequency filtering for each trace seismic data to suppress the high frequency interference and random noise,then,use TT filtering to suppress the surface wave with low frequency.Finally,we use this method to real seismic data processing,and compare it with the traditional high-pass filter method.The result reflects the effective of TT transform in suppressing surface wave.
TT transformation (Time-Time transformation) is a new method to process non-stationary signal based on S-transform,it has a good ability of frequency conversion.The surface wave,with lower frequency compared with other seismic wave,can be suppressed through extracting the TT spectrum's diagonal elements of seismic data.However,this method has a deficiency that in pressing low-frequency signal,a part of high-frequency interference is retained that can be eliminated by S transformation.Firstly,we apply S transform time-frequency filtering for each trace seismic data to suppress the high frequency interference and random noise,then,use TT filtering to suppress the surface wave with low frequency.Finally,we use this method to real seismic data processing,and compare it with the traditional high-pass filter method.The result reflects the effective of TT transform in suppressing surface wave.
引文
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[2]ROBERT C,PINNEGAR.The generalized S-ransformand TT-transform in one and two dimensions[D].Theuniversity of Western Ontario London Ontario,2001.
[3]ROBERT C,PINNEGAR,MANSINHA C.A method oftime-time analysis:The TT-transform.Digital[J].signalProcessing.A Review Journal,2003,13:588.
[4]ROBERT C R.Time-frequency and time-time filteringwith the S-transform and TT-transform[J].Digital sig-nal Processing:A Review Journal,2005,15:604.
[5]FAN X,ZUO M.Gearbox fault detection using Hilbertand TT-transform[J].Key Eng Mater,2005,293:79.
[6]SIMON C,SCHIMMEL M,DANOBEITIA J.On the TT-transform and its diagonal elements[J].IEEE transac-tions.on signal processing,2008,56(11):5709.
[7]杨成林.瑞雷波勘探[M].北京:地质出版社,1993.
[8]刘发启,张关泉.小波变换与F-K算法在滤波中的应用[J].石油地球物理勘探,1996,31(6):782.
[9]巩向博,韩立国,王恩利,等.压制噪声的高分辨率Radon变换法[J].吉林大学学报:地球科学版,2009,39(1):152.
[10]陈爱萍,邹文.基于S-变换的面波压制[J].世界地质,2005,24(1):82.
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