RIO DE JANEIRO (AP) -- Brazil's state-run energy company said Friday it cannot confirm a claim by Peru's president that it found at least 1 trillion cubic feet of natural gas in Peru.

Petrobras said it will analyze its findings after drilling a 13,100-foot (4,000-meter) well in the Peruvian jungle, adding that it will be a few weeks before it announces either the size or the commercial viability of the field.

Petroleo Brasileiro SA issued its statement a day after Peruvian President Alan Garcia said Petrobras had made an enormous discovery in Cuzco province that would help ensure Peru's gas supply for four decades.

Garcia said Peruvian oil officials estimated the field holds up to 5 trillion cubic feet of gas.

On Friday, Garcia said he understood Petrobras' caution, but insisted the company had discoverd at least 1.5 trillion cubic feet of natural gas.