With a string of recent discoveries in the pre-salt areas in deep-water offshore Brazil, this hydrocarbon province has proven to be of global importance. The pre-salt reservoirs, however, present many challenges for exploration. In this paper, we describe the acquisition and processing of a fullazimuth towed-streamer seismic survey designed for presalt exploration offshore Brazil. We show that this solution overcomes many of the pre-salt exploration challenges to provide high-quality reservoir information in an efficient manner. Figure 6: Areal map of traveltime residuals (ms) plotted at the 3D VSP source locations, using an intermediate velocity model. Figure 7: Existing 2D depth migration (top) and full-azimuth TTI anisotropic Kirchhoff depth migration of the coil data (bottom). Pre-salt reflections (highlighted) are well imaged 2D data courtesy of TGS and WG

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