Improving Pre-Salt Imaging using Heritage Seismic Data in the Offshore Kwanza Basin

Summary The majority of data acquired to date in Kwanza basin, is limited-offset, narrow-azimuth towed-streamer seismic, which with the heritage data processing and imaging workflows currently applied presents a number of unresolved challenges for pre-salt interpretation and reservoir characterization. In this paper we demonstrate how the latest seismic data processing and imaging technologies, including broadband signal processing and elastic FWI overcome some of the challenges of heritage seismic data to provide a cost-effective way to reduce exploration risk across the basin. We illustrate this with two reprocessing case studies, one from block 20/21 where the salt is moderately complex and ongoing work in block 35 where the overburden is significantly more complex.