λ-f域抛物Radon变换多次波压制方法

Investigation of multiple suppression by parabolic Radon transform in λ-f domain

空间截断效应降低传统Radon变换压制多次波的精度.提出一种λ-f域抛物Radon变换方法,与传统最小二乘抛物Radon变换相比,地震数据变换到λ-f域后表现为直线的映射,更便于设计滤波函数,从而有效消除传统多次波压制过程中空间截断效应的影响.另外,新变量λ的引入,使Radon正反算子成为与频率无关的矩阵,可大幅度提高计算效率.理论模型和实际海洋地震数据多次波压制试算结果表明,提出的λ-f域抛物Radon变换法可有效实现多次波压制,提高地震数据的信噪比,具有较强的实用性.

Radon transform is widely used in multiple suppression in seismic data processing.However,the suppression precision is affected by spatial truncation artifacts in traditional Radon transform.Theλ-fdomain Radon transform is proposed in this paper for multiple suppression.Compared with the conventional least-square Radon transform,the parabolic events is imaging linear events inλ-f Radon domain,which can eliminate the spatial truncation artifacts and design the filter function easily.Via introducing the new parameterλ,the Radon transform operator and inverse operator have nothing to do with the temporal frequency parameter,which can significantly improve the computational efficiency.The multiple suppression result for theoretical and field data shows that the proposedλ-f domain Radon transform algorithm can suppress multiple and improve the signal to noise ratio effectively.