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.
出处
《物探化探计算技术》
CAS
CSCD
2011年第3期252-257,226,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
"863"国家高技术研究A类课题(2007AA06Z103)
交通部西部交通建设项目(200731881262)
长安大学科技创新计划项目(CHD2010ZY004)
关键词
面波压制
时频分析
S变换
TT变换
surface wave suppression
time-frequency analysis
S-transformation
TT-transformation
