Natural oil seeps and seepage slicks have historically provided invaluable information to oil explorers in frontier deep and ultra-deep-water areas for the assessment of leased and/or open acreage exploration areas. Foremost, they are considered a direct hydrocarbon indicator for the presence of active petroleum systems in areas that have not yet been drilled. In order to lower exploration risk and gain a better understanding of the presence of working petroleum systems in the unexplored areas offered in the 17th ANP Bidding Round, BPS together with Geospatial Petroleum (GP) prepared an extensive detailed local evaluation of the presence and behavior of oil slicks/seeps in the areas on offer. The areas to be investigated include the outboard area of the Santos, Campos and Pelotas basins, as well as the ultradeep waters of the Potiguar, Sergipe-Alagoas, Para-Maranhão and Foz do Amazonas basins.