逆频散方法压制频散面波

Dispersive surface wave suppression by inverse-dispersion

由于面波的频散特性,在频谱或f-k谱上与反射波互相重叠,应用传统基于切除法的滤波方法在压制面波的同时,也会损伤有效反射波。本文提出一种通过相位校正消除面波频散、进而分离出面波能量并予以滤除的逆频散方法,该方法是在共炮点地震道集上消除因面波频散引起的走时差异。模型数据测试和实际资料处理结果表明,该方法能有效地压制面波且有利于去除空间假频。

For the characteristic of dispersion,surface waves and reflections are overlapped in spectral domains.Traditional processing such as surgical muting may cause damage to data in terms of waveform distortion and narrowing the spectral band of data.In this paper,a new method named inverse-dispersion(ID) algorithm is presented to suppress surface waves.Events of surface waves are easily to be separated by removing the difference of travel time which is caused by dispersion.The method also shows its power in attenuating the aliasing of surface wave.Both synthetic and field data examples confirm that our new approach suppresses surface waves while maintains reflections.