Petrobras farmed into the Gamba, Santola and Lavagante blocks into the Alentejo basin in a 2010 deal.
But Galp indicated in materials at the North American Prospect Expo (Nape) that its stake was now at 100% for the three areas.
The Lisbon-based company aims to farm down up to 80% of its holding with drilling seen as soon as 2015, the company told Upstream.
"We're