利用二维小波变换实现叠前分离面波

提出一种新的叠前分离面波技术,即依据面波和有效波视速度的范围,把原始单炮记录分成不受面波影响的区域和受面波影响的区域,然后利用二维小波变换对受面波影响的区域进行时频分析,从中提取有效波,再将其与不受面波影响的区域合并,就得到分离面波后的记录,该方法计算速度快,稳定性好,自适应性强,没有任何限制条件。通过实际资料的处理结果表明,该方法在叠前分离面波具有良好的效果。

Application of 2D Wavelet Transform to Prestack Separation of Surface Wave

A new method for separation of prestack surface wave is proposed as follows: by apparent velocities of surface wave and effective wave, dividing the original seismic data into two areas with and without surface wave influence, and then making time-frequency analysis of area with the influence using 2D wavelet transform, from which picking up the effective wave, finally, making combination of it with the area without the influence. The result is the record after prestack separation of surface wave. This method is characterized by quick computation, good stability, desirable adaptability and no limitation. Real data processing shows that good result can be obtained by this method for prestack separation of surface wave.