Application of the frequency-wave number (F-K) and the radial trace transform (RTT) in the attenuation of coherent noise in onshore seismic data

Abstract

The 2D frequency-wave number (F-K) and the Radial Trace Transform (RTT) techniques; both based on Local Wave Field Decomposition (LWD) were applied to 3D seismic data acquired from an onshore Niger delta field. The objective of the study was to attenuate coherent dispersive ground roll energy and to establish which of the techniques would attenuate the ground rolls most effectively. In applying the local wave field decomposition techniques (RTT and F-K) to attenuate coherent noise from acquired seismic data, the data was transformed into RTT and F-K domains, respectively from the conventional offset domain to attempt the separation of signal and coherent noise in this new domains, the LWD was applied and the results transformed back to the original offset domain. Results show that both techniques attenuated the coherent noise-ground roll energies appreciably. However, RTT was a better technique than the F-K for noise attenuation based on the clarity of primary events which we seek to enhance at the expense of the ground roll energy.