The Sao Paulo-headquartered bank will participate in work underway by offices of the Brazilian state-led company in Angola, Benin, Gabon, Namibia, Tanzania and Nigeria.
Petrobras is amid a roughly $10 billion programme to sell off assets as it works to fund huge capital committments in Brazil and elsewhere.
“The formation of this joint venture is an important step for Petrobras under its divestment programme, allowing the expansion of its operations in Africa and the sharing of investment required for the expansion and development of its reserves,” Petrobras said in a statement.
Deals in Africa have been piecemeal thus far, with the Brazilian giant selling off a piece of a Tanzania interest to Statoil.
The agreement will be the “preferred vehicle for new investments of this nature on the continent,” Petrobras said in a statement.