基于小波包变换的面波分离技术研究

依据面波视速度的分布范围,提出一种新的叠前面波分离技术,即把地震波场分成不受面波影响的波场和受面波影响的波场,然后利用小波包变换对受面波影响的波场进行时频分析,通过分解与重构,从中提取有效波,再将其与不受面波影响的波场合并,就可得到面波分离后的地震波场。该方法在成功分离面波的同时,可使有效波的能量(尤其是其低频能量)不受损失,既有效地保持信号的频宽不变,又提高了记录的信噪比。实际资料的处理结果表明:此方法在叠前面波分离方面具有有良好的效果。

The research of surface wave separation technique based on wavelet package transform

Using apparent velocity distributing area of surface wave,this paper develops a new method for pre-stack surface wave separation.In the method,the seismic wave filed is divided into surface wave filed and non-surface wave field,and then the time-frequency analysis is carried on to the surface wave field using the wavelet package transform.After the decomposition and reconstruction,pick up effective waves are pick up,and finally combined with the no surface wave field,the seismic signals of surface wave are separated.The new method separates surface wave successfully,meanwhile it also avoids the loss of effective wave energy particularly,low frequency energy,preserves the frequency band width of signal and raises the signal/noise ratio of seismic data.Real data results show that it is effective on the pre-stack surface wave separation.