广义S变换去除面波技术及应用

GENERALIZED S-TRANSFORM AND ITS APPLICATION TO REMOVE SURFACE WAVE

在叠前地震资料中的面波,是影响地震资料信噪比和分辨率的主要因素。传统的压制面波的方法,都不可避免地存在一些缺陷。广义S变换可以将单道地震记录从时间域变换到时频域,使面波和有效波在时频域上明显分开,在时频域上切除面波后再反变换回时间域,即可达到去除面波的目的。这里通过广义S变换的方法去除叠前资料中的面波,对理论模型和实际资料的应用效果表明,该方法在去除面波的同时,对有效波也有很好的保护,去噪后整个资料的信噪比和分辨率都得到了很大的提高,且不会出现空间假频。

Surface wave is the main factor that affects signal to noise ratio and resolution in pre-stack seismic data.The traditional methods of suppression of the surface wave have some unavoidable defects.Generalized Stransform can transform the single-channel seismic records from the time domain to the time-frequency domain,make the surface wave and effective wave separated clearly in the time-frequency domain,cut the surface wave in the time-frequency domain then inverse transform back to the time domain we can remove the surface wave.Removing the surface wave via the generalized S-transform in the pre-stack seismic data is proposed in this paper,the theoretical models and real data results show that this method can remove surface wave while the effective wave also has very good protection,signal to noise ratio and resolution of the data have been greatly improved and avoid spatial aliasing.