A huge offshore oil discovery could raise Brazil's petroleum reserves by a whopping 40 percent and boost this country into the ranks of the world's major exporters, officials said according to an AP report. The government-run oil company Petroleo Brasileiro SA, or Petrobras, said the new "ultra-deep" Tupi field could hold as much as 8 billion barrels of recoverable light crude, sending Petrobras shares soaring and prompting predictions that Brazil could join the world's "top 10" oil producers. Petrobras says the Tupi field, off Brazil's southeastern Atlantic coast, has between 5 billion and 8 billion barrels -- equivalent to 40 percent of all the oil ever discovered in Brazil.