OBN for pre-salt imaging and reservoir monitoring – Potential and road ahead

Abstract

Recent giant pre-salt discoveries offshore Brazil have made the Santos basin one of the most active areas for oil and gas exploration. Until recently, most of the basin has been covered only with narrow azimuth towed streamer (NATS) seismic data. The limited illumination provided by NATS data is not sufficient to image the pre-salt reservoirs through the geological complexities abundant in the area, such as variable thickness of stratified salt layer, complex salt overhangs and igneous intrusions.