波场延拓深度滤波方法

WAVEFIELD CONTINUATION DEPTH FILTERING

消除面波是地震数据处理中的一个重要内容．本文提出了基于15°波动方程的深度滤波方法．由于面波与有效反射波具有不同的传播深度，可利用波场向下延拓方法将二者进行波场分离．把向下延拓后的波场中集中在地表附近的面波能量切除后，再将波场重新延拓回原始的观测面，达到去除干扰的目的．实际资料处理显示：方法计算稳定，消除面波能力强，能更好地保持波场的有效成份和幅值，符合波场的实际传播状态，表明该方法正确可行．

Suppressing ground roll is an important subject in seismic data processing. In this paper, the depth filtering method based on 15-degree wave-equation is presented.Ground roll and reflection wave have different propagate depth and they can be seperated by wave-equation downward continuation. The shallow energy is ground roll and this part of energy can be cut off, subsequent upward continuation of the wave field reconstructs the original surface recorded wavefield, in this way, ground roll is removed. Real seismic data has been processed and demonstrated that this method has stable calculation and strong ability to remove ground roll. This method can largely maintain valuable part of wavefield and it is consistent with the theory of wave propagate, the results indicate that the method is right and feasible.