Multiple Attenuation by F-X Parabolic Radon Transform

Multiples constitute one of the most troublesome forms of coherent noise in seismic exploration. Multiple reflections often destructively interfere with the primaries of interest. Therefore, suppressing multiples from reflection seismograms during processing stages is necessary. Radon transform is a robust tool for suppressing multiples from seismic data. The key idea in Radon based multiple attenuation is to map the CMP gather to a new domain where seismic reflections collapse to point-like events and, therefore, primaries and multiples are separable. The time invariant parabolic Radon transform is widely accepted for multiple suppression. The benefit of time invariance is that the computations can be performed in the frequency-space domain and so the computational costs are reduced. In this procedure, the first step is to replace hyperbolic events in offset domain with parabolas by applying NMO correction using velocities of primaries. In the next step, the data are transformed to the Radon domain by stacking amplitudes along parabolic trajectories. In this paper, a MATLAB coding for multiple attenuation using the parabolic Radon transform has been implemented and successfully applied on a synthetic model and a real data set. KEYWORDS: Radon transform, multiple attenuation, SNR enhancement, coherent noise