WorldOil (subscription) | Petrobras discovers oil accumulation in Campos basin pre-salt layer WorldOil (subscription) This is the first commercial discovery of oil in the pre-salt layer of the Marlim Sul area. The discovery occurred during drilling of well 6-BRSA-1349-RJS (ANP nomenclature) / 6-MLS-233-RJS (Petrobras nomenclature), informally known as Poraquê Alto, at ... Petrobras proves presalt oil in Marlim Sul area |