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.
With these announcements, the number of statements of commercial potential made this week alone rose to four. The other statement was in relation to the huge Papa-Terra field in the Campos Basin, with potential recoverable volume estimated between 700 million and 1 billion barrels of oil equivalent, and production start-up projected for the end of 2011. Also announced this week was the discovery of a new oil accumulation (28 ° API) in the Marlim Leste field, which opens up a new frontier of exploration in the Campos Basin. This may result in further discoveries of lighter and better-quality oil.
The commercial potential of the Inhambu field was also announced in 2005. The Inhambu field is in the onshore Espírito Santo basin in the city of Jaguaré, 180 km from Vitória. Moreover, in 2005 the Company announced the discovery of excellent-quality oil in the city of Esplanada in Recôncavo Baiano in the state of Bahia. These two announcements reflect Petrobras' renewed efforts towards production in Brazil's onshore basins.
These results bring Petrobras ever closer to the goal outlined in its Strategic Plan of increasing oil and natural gas production to 2,860,000 barrels per day in 2010, in Brazil alone.
In addition to guaranteeing ongoing production growth, the new discoveries show the prudence of the Company's exploration program, which emphasizes deepwater and ultra-deepwater drilling, research in new areas, and renewal of onshore work. This approach allows a long-term reserve/production relationship, and consequently guarantees the sustainability of self-sufficiency, which will be attained in the coming months.
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