Oil companies, including Shell and Statoil, have said they are mulling bidding in auctions to be held later this year.
The country faces fierce competition to attract the billions of dollars of investment needed to develop deepwater reserves. Several other Latin American countries are auctioning offshore blocks this year.
For Big Oil, the potential access to Latin American energy reserves is unprecedented. In many countries now opening, including Argentina, resource nationalism has long barred their entry or limited opportunities.