提高地震分辨率和信噪比的叠前T0校正方法

Introducing pre-stack T_0 correction method—a new approach to raise resolution and S/N ratio

地震成像处理中因动校正不当导致同相轴出现弯曲的现象,进而降低叠加剖面的分辨率和信噪比。本文利用滤波后的近零炮检距地震道作为参考道,再利用道间的相关特性获取各道的T0校正量,对道集进行校正,并采用Sinc函数高精度插值,使得原道集上的同相轴趋于水平。叠加后断点成像效果得到明显改善,同相轴变细、频带变宽,从而提高了地震成像的分辨率和信噪比。

The incorrect NMO causes distortion for the seismic events in seismic imaging,as a result the resolution and S/N ratio on the seismic sections were reduced.By utilizing filtered near zero-offset seismic traces as reference traces,using each trace’s T0 correction values extracted based on inter-trace correlation characteristics to correct the seismic traces,then after conducting sinc function high precision interpolation the seismic events in the seismic traces were flatten.After stacking the imaging for fault point was greatly improved,the frequency band was broaden,as a result the resolution and S/N ratio for seismic imaging were raised.