(ADPnews) - Dec 20, 2010 - The discovery of light oil in the post-salt layer of the Espirito Santo basin is positive not only for its finder, Brazil's oil and gas giant Petrobras (SAO:PETR3, NYSE:PBR), but also for local sector firm OGX Petroleo e Gas Participacoes (SAO:OGXP3), according to JPMorgan.