Print this pageRegional Seismic Mapping and Play Assessment in Santos Basin, SE Brazil Offshore, Using Two Different Data Sets
The Santos basin, located at the eastern Brazilian Atlantic margin at the southwest of the Campos basin, has been lately attracting the attention of oil companies due to the recent hydrocarbon discoveries in the pre-salt play. Systematic, regional 2D seismic mapping has been carried out in the Santos basin, aiming at characterizing the main aspects of its stratigraphical and structural frameworks. Six horizons have been mapped (the Basement, the salt base, the salt top, the Albian top, the Santonian top and the Upper Cretaceous unconformity), as well as the rift and salt-related faults. The use of two different data sets has allowed advances on the understanding of the main plays in the Santos basin. One data set, from Western/Geco, is composed of about 30,000 linear kilometers of good quality 2D seismic lines, from which the main regional maps were obtained. Detailed stratigraphic and structural features that support the construction of a better-constrained geological model were assessed using higher-quality 2D seismic lines of the BrazilSpan Survey from GX Technology. Based on the systematic mapping of the Western/Geco data set the main depocenters and structural elements were delineated, which can be visualized as surfaces distributed all over the study area. These maps evidence some interesting 3D features, mainly those related to halokinesys and associated with sequence deposition along mini-basins, controlled by salt tectonics. It also characterized the geometry of sequence boundaries and correlative seismic signatures. Despite the regular distribution of Western/Geco lines, which permitted the accurate geographic distribution of these horizons, their geometry in 2D was strongly improved with the interpretation of the high quality data of BrazilSpan lines, giving a better visualization of individual features.
AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil