Velocity Update Using High Resolution Tomography in Santos Basin, Brazil

The exploration interest in the Santos Basin offshore Brazil has increased with the large deep water pre-salt discoveries, such as Tupi and Jupiter. As the overburden of reservoir has complex structures in the Santos Basin, a reliable seismic image in depth domain is critical to exploration success in this region. In order to obtain a high quality seismic image, an accurate velocity model is crucial. With implementation of high resolution tomography algorithms, smaller scale velocity details are able to be captured in seismic surveys with complex structures. Here we present an application of high resolution tomography for velocity update in the Santos Basin, which resulted in improved supra-salt and pre-salt images after depth migration. We also discuss the possibility of using Reverse Time Migration (RTM) 3D angle gather for model building in this area.