Brazilian state-controlled oil company Petrobras said its domestic crude output came in at an average of 1.98 million barrels per day last month, up 7.4 percent from September 2012.

Its domestic oil production rose 3.7 percent compared to August, the company said in a statement.

Petrobras posted its lowest output in more than four years in September 2012 because several offshore platforms underwent maintenance that month and were out of service.

The company attributed the higher production last month to new wells being connected at four of its offshore platforms.

"The highlight of the month was the monthly record achieved in pre-salt areas, which reached 326,800 barrels per day," the statement said.

The ultra-deep, "pre-salt" oil fields were discovered in recent years and stretch for some 800 kilometers (500 miles) off the coasts of the southeastern states of Espirito Santo, Rio de Janeiro, Sao Paulo and Santa Catarina.

That new frontier, so-named because the fields are located under water, rocks and a shifting layer of salt at depths of up to 7,000 meters (22,950 feet) below the surface of the Atlantic, could dramatically increase Brazil's proven-reserve tally and transform the country into a major crude exporter.

Petrobras said total production of oil and natural gas - both domestically and abroad - came in at 2.58 million barrels of oil equivalent in September, up 3 percent from the previous month. EFE