利用伪速度方法压制浅海鬼波

Shallow Sea Deghosting with Pseudo Velocity Method

采用基于用传统方法获取的海上单分量地震资料,估算出同一位置速度的垂直分量(伪速度),再与单分量压力数据联合,达到压制鬼波的目的。将稀疏约束的反卷积方法作为鬼波压制的关键环节,使得在浅海环境下,由海水表面引起的检波器端上、下行波干涉产生的陷波问题得到改善,同时低频能量得到增强,提高了数据的分辨率。该方法可用于海上单分量压力数据的再处理,拓宽数据的频带范围。

Based on marine single-component seismic data acquired by conventional acquisition method,the vertical component of velocity(pseudo-Vz)at the same position is estimated.The pseudo-Vz is then combined with the single component of pressure data to get the aim of deghosting.By applying the sparsity constraint deconvolution method as an intermediate procedure,improvements of shallow sea single-component seismic data in resolution as well as in filling the frequency notches,which are caused by the interference of the up-and downgoing waves at the receivers are achieved.In addition,the energy of low-frequency signal is enhanced.The proposed method can be used for re-processing the existing single-component data through which can broaden the frequency bandwidth.