Study of inter-bed multiples in an onshore Niger Delta field

Abstract

This study presents the existence of inter-bed multiples in an Onshore Niger Delta field. Multiples interfere with primary reflections in a manner that results in, among other factors, poor velocity model building, unclear seismic images of the subsurface, and definition of geological features that finally lead to pitfalls in interpretation. Analysis of the velocity model revealed localized anomalies and abnormal trends in the interval velocity regression due to possible multiples effects. Confirmation of existence of inter-bed multiples was established and the parabolic Radon transform algorithm attenuation technique was implemented on a seismic dataset acquired from onshore Niger Delta field in a bid to suppress multiples’ presence. The events experience slower velocity and low amplitudes due to energy dissipation along the propagation paths and the separated artifact. The effectiveness of parabolic Radon transform algorithm in suppressing multiples was verified by comparing the migration models obtained before and after the application of the algorithm; which shows improved image values and clarity of plays that can be characterized in terms of amplitude variation with offset studies for optimal prospect identification and appraisal, enhanced oil recovery, and reservoir management.