After four-years of searching for oil and gas off the coast of Portugal, Brazilian state-run energy giant Petroleo Brasileiro SA (PBR, PETR4.BR) believes there's still a chance to find crude in the Peniche Basin, Jose de Freitas, Petrobras' head of Portuguese operations, told Diario Economico in an interview published in its Friday Internet edition.

While admitting Portugal's project remains of high-risk, the executive said there's a 10% to 12% chance of finding oil off the Portuguese coast.

De Freitas added that in 2012 the group led by Petrobras will be able to decide in which of the areas being explored there's a higher chance of finding hydrocarbons and therefore proceed with a well drilling.

Petrobras holds a 50% stake in this exploration project, while Galp Energia SGPS (GALP.LB) and Partex have a 30% and a 20% stake, respectively.