炮集域压制海水鸣震的τ-p变换法

Marine Reverberation Attenuation on Shot Gathers Using τ-p Transform

利用Radon变换压制多次波的传统做法一般都是先进行叠加速度分析,然后在CMP道集上做相应滤波处理。实际资料处理中,带有多次波的速度分析难以准确地提取速度,进而造成多次波压制的效果不够理想。有别于传统的做法,本文提出的方法通过对炮集记录进行同相轴重排,运用变换域自适应切除的τ-p变换(线性Radon变换)滤波,实现了直接在炮集记录中压制海水鸣震。实际资料处理表明,该方法对于海水鸣震多次波压制是一种行之有效的方法。

The conventional multiple attenuation techniques using the Radon transform are usually involved first in stacking velocity estimation of primary or multiple reflections, and then filtering multiple reflections on CMP gathers. However, multiple reflections usually impair with the accuracy of velocity analysis, and as a result, good performance of multiple suppressing cannot be achieved in such a case. Different from the conventional techniques that are applied on CMP gathers the new method presented in this paper is directly applied on shot gathers. Based upon the ideas of event realigning and adaptive energy removal of multiples, the approach can directly eliminate reverberations on shot gathers using the linear Radon transforms. Field data test results demonstrate that this new method is robust for eliminating the reverberations on shot gathers.