Petrobras (PBR)

Statement of Commercial Potential of Three New Light Oil and Gas Fields

(Rio de Janeiro, December 29, 2005). – PETRÓLEO BRASILEIRO S/A - PETROBRAS, [Bovespa: PETR3/PETR4, NYSE: PBR/PBRA, Latibex: XPBR/XPBRA], a Brazilian international energy company, announced that it sent a Statement of Commercial Potential of three new oil and gas fields to the National Petroleum Agency (ANP) today: Uruguá and Tambaú, in the Campos Basin, and Canapu, in the offshore basin in Espírito Santo, all operated exclusively by Petrobras, which holds 100% of the concession. With this, the number of statements of commercial potential of oil and gas fields made by Petrobras in 2005 is now five. The other two statements referred to the giant Papa-Terra field in the Campos Basin, and the Inhambu field, in the onshore Espírito Santo basin.

The Uruguá and Tambaú fields are located in the Campos Basin approximately 160 kilometers off the coast of the city of Rio de Janeiro, in water depths ranging from 1,000 meters to 1,400 meters. These fields resulted from the evaluation plans of the old BS-500 Block.

The Uruguá field is composed of light oil and natural gas accumulations. The natural gas deposit was initially discovered by exploratory well 1-RJS-587, with an in situ estimated volume of 34.4 billion cubic meters (217 million barrels of oil equivalent). The oil reserve was found by well 1-RJS-621 and has an estimated in situ volume of 250 million barrels, with an API grade of 33. Thus, the field’s total in situ volume is projected to be 467 million barrels of oil equivalent.

The Tambaú field, discovered by well 1-RJS-625, is composed of an estimated in situ natural gas accumulation of 48.5 billion cubic meters (305 million barrels of oil equivalent).

In the Canapu field in the offshore Espírito Santo basin, preliminary geological readings indicate an estimated 8.5 billion cubic meters of in situ natural gas (53.5 million barrels of oil equivalent) and 47.2 million barrels of oil and condensate, totaling 100.7 million barrels of in situ oil equivalent. Canapu is located nearly 100 km northeast of the Vitória coastline and 17 km east of the Golfinho oil field.

The well through which the discovery was made, 4-ESS-138-ES, was drilled at a water depth of 1,608 meters and crossed reserves with porous rock density of 54 meters that were saturated with natural gas, condensate and oil. Preliminary tests revealed excellent productivity of gas.

These statements of commercial potential report the volume of oil in situ, which is the total of oil and gas in the fields. These statements require greater technical evaluation to define the recoverable volumes, as they deal with new basins that require further studies, as volumes will vary from field to field. In the statement of commercial potential related to the huge Papa-Terra field, the field's recoverable volumes are already indicated, as they deal with a well-known basin. Petrobras has an important program called PRAVAP - Program for Advanced Recovery of Oil (Programa de Recuperação Avançada de Petróleo) created in 1993, for the purpose of increasing the recovery factor from its fields and prolonging their production to the utmost, in an economically and environmentally sound manner.