Simple net pay estimation from seismic: a modelling study

Amplitude scaling techniques are a simple way of removing the effect of tuning on seismic maps and predicting net pay thickness in low-impedance hydrocarbon-bearing sands. This modelling study addresses net pay prediction in layered sand/shale reservoirs using reflectivity and band-limited impedance approaches. It is demonstrated that net pay prediction using band-limited impedance is more accurate than reflectivity. These techniques, however, are only appropriate in specific geological circumstances. Prior to application, it is advisable to evaluate potential accuracy through modelling as well as to consider the benefit of amplitude-versus-offset projections.