E. Efthymiou, H. Morris, M. Kemper, (Ikon Science) J.D. Kerr (Salamander)
AVO analysis is increasingly becoming part of the everyday workflow, however it is often found that existing data sets require further conditioning in order to extract accurate reservoir properties within the zones of interest. We present a systematic workflow which incorporates the understanding taken from the well based AVO analysis to align the seismic data to the true AVO signal of the earth. Rock Physics analysis of well data from 4 wells intersecting the same geological formation has concluded that the best lithology and fluid discriminators are Intercept and Gradient reflectivities along with their associated Acoustic and Gradient impedances. The theoretical AVO response derived from well data over the field area was consistent enough to provide high confidence. This AVO modelling suggested that at the top reservoir level we should observe a strong positive gradient.