Petrobras said it has now concluded the drilling and appraisal of the seventh well in the block, located in the north-east section 180 kilometres off the coast of Rio de Janeiro.
The 3-RJS-742A well, informally known as NW2, has confirmed the discovery of good-quality oil - 27 degrees API - in highly productive reservoirs.
"The new well has discovered Libra's largest net pay to date, with 410 meters of thickness.
