01-09-09 Petrobras made an oil discovery in carbonate reservoirs in the Campos Basin post-salt layer. The discovery was made with well 1-BRSA-713-RJS (1-RJS-661), known as Aruana, in Block BM-C-36, which is operated by Petrobras.
Preliminary analysis indicates recoverable volumes of an estimated 280 mm barrels of 28 degree API light oil, as well as good productivity. The discovery well is located nearly 75 miles (120 km) off the coast of Rio de Janeiro, at a water depth of 3,205 feet (977 m).

The discovery was proved though a lined well formation test in reservoirs at depths ranging from 9,820 feet (2,993 m) to 10,246 feet (3,123 m), and will be the object of a discovery assessment plan to be submitted to the ANP, Brazil's oil and gas regulator.
Geologically similar reservoirs have already been identified in the Santos Basin through the 6-MLS-122-RJS (Jurara) and 6-MLS-146 D-RJS (Mucua) wells in the Marlin Sul field in 2007 and 2009, respectively. These wells were drilled at water depths of 3,937feet (1,200 m) and the estimated volume of recoverable 27-degree API oil is 350 mm barrels.

The development of these projects is considered in the 2009-2013 Strategic Plan, with the start-up of the production in Jurara already occurring this year trough the platform P-51.
The start-up of the Mucua field is expected to occur in 2010 through platform P-56.