Elimination of multiples from marine seismic data using the primary-multiple intermediate velocities in the t-q domain
Abbasi, S. and Ismail, A., 2021. Elimination of multiples from marine seismic data using the primary-multiple intermediate velocities in the t-g domain. Journal of Seismic Exploration, 30: 85-100. Removing seismic multiples is one of the essential steps in seismic data processing and is often carried out using the Radon transform (intercept time (t) and curvature (q) domain). In this method, the normal moveout (NMO)-corrected CDP gathers using primary (signal) velocity are transformed into the t-q domain where multiples can be separated from primaries, based on their curvatures, and muted. A drawback of using the primary velocity for NMO correction is that primaries and multiples often exhibit similar curvature in the t-g domain, particularly at near offsets. We propose the use of velocity function intermediate between primaries and multiples for the NMO correction of the CDP gathers as input to t-q¢ domain to enhance primaries- multiples separation. The primary-multiple intermediate velocity approach is applied to synthetic and real short-streamer marine seismic data. A semblance-weighted Radon transform is used to reduce smearing in the radon space. The results showed more primary-multiple separation and better multiple removal.
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