Brazilian regulator ANP extended the concessions for 27 years, until 2052, which Petrobras said would allow the maximum economic exploitation of the remaining reserves at the mature fields.
It also said the extension would allow it to expand the water injection capacity and fluid processing at the fields, as well drill 10 new wells.
In March the Marlim and Voador fields, combined, produced roughly 150,000 barrels of oil and 2 million cubic metres of gas per day.
Upstream reported earlier this year, Petrobras was planning to install two new floating production, storage and offloading vessels at Marlim, with the first vessel to enter operations in 2019.