Regulators are finishing up final environmental studies for the round, which will offer 269 blocks including 51 in the high-profile exploratory frontier of the Pelotas basin.

"We see this is an opportunity for companies to increase their participation in the Brazilian market or enter for the first time," Brazil energy minister Eduardo Braga told a luncheon event at OTC.

Brazilian officials are hoping that investor interest will persist despite a sprawling corruption scandal that had rocked the country's oil industry to the core as well as sharply lower oil prices.

Brazil