Detection of Saturation Changes in a Turbidite Sand by 4D AVOA

A-31 DETECTION OF SATURATION CHANGES IN A TURBIDITE SAND BY 4D AVOA Summary 1 A seismic data processing methodology is developed on the basis of parallelized restricted offset and azimuth pre-stack processing (PROAP) for P-wave OBC time-lapse data. It is designed to preserve the directional signature cross-equalize datasets and generate a suitable input to a filter that separates seismic anisotropy from the static and isotropic ‘geological’ response. Application of this procedure reveals discrete time-lapse anisotropy anomalies in a turbidite sand body. These anomalies change intensity during production with their position and orientation coinciding with the highest net-to-gross sands. The anomalies