Brazil's state-led company said that the BM-S-24 area has been sized up with recoverable reserves of 130 million barrels of oil equivalent.
Petrobras operates the area with a 80% stake with Portugal's Galp on 20%.
It lies 250 kilometres off the coast of Rio de Janeiro state in a water depth of 2165 metres.
Sepia East is an extension of the original Sepia field, which lies in unlicensed acreage operated by Petrobras and was declared as commercial in 2014.
According
