BRASILIA, Feb 10 (Reuters) - Petroleo Brasileiro SA and its consortium partners have concluded drillingand testing of the first well in the Libra prospect, the largestoffshore oil discovery in Brazil's history, the state-runcompany said on Tuesday in a securities filing.
Petrobras said the tests confirmed the existence of a280-meter column of oil with an API gravity of 27 degrees in thewell known as 3-RJS-731.
"The two tests, carried out in different areas, confirmedthe excellent productivity and quality of the oil in thosereservoirs," the filing said.,
Libra was the first Brazilian sub-salt area to be auctioned.The 35-year concession was bought in 2013 by a consortium led byPetrobras, with a 40 percent stake. Other members includeFrance's Total SA and Anglo-Dutch Royal Dutch ShellPlc with 20 percent each, as well as China's NationalPetroleum Corp and CNOOC, with 10 percenteach. (Reporting by Anthony Boadle; Editing by Christian Plumb)