Abstract: 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.

Key words: 2D wavelet transform, time-frequency analysis, separation technique, surface wave