29-07-09 Regarding a story published on July 28, 2009 titled "In the pre-salt, 32 % of the wells that are drilled are little feasible," Petrobras clarifies that the rate of success has been 100 % in the Santos Basin's pre-salt region.
The map that has already been divulged (blue area) showing the pre-salt area, which ranges through the Santos and Campos Basins, does not correspond to a single oil field. In addition to the existence of the reservoir rock, the discovery of an oil field results from the simultaneous identification and presence of a series of geological factors, which define the position of the exploratory wells in a given sedimentary basin.

During the history of exploration in the Campos and Santos Basins, several wells have identified the mentioned reservoirs; however, they were not drilled under ideal geological situations and their specific purpose was not to seek discoveries in pre-salt reservoirs. As of 2006, when the pre-salt carbonate rocks were actually proven to be potential oil accumulation reservoirs, Petrobras drilled 11 wells in the central area of the Santos Basin with these reservoirs as their main objectives.
All of these wells resulted in discoveries (a 100 % success rate) and the Assessment Plans are currently being prepared for them, as approved by the NPA and widely announced by the company.

As divulged on Form-20F (the Annual Securities and Exchange Commission Report), through late 2008, a total of 30 wells were drilled in the pre-salt region, which ranges from the Campos to the Santos Basin, and a success rate of 87 % has been attained in proving the presence of hydrocarbons.
So far as well 6-BG-6P-SPS is concerned, which is also known as Corcovado-1 and is located in Block BM-S-52, the company reasserts the information the operator (BG Group) and later Petrobras divulged by means of an announcement to the market made on 04/08/2009, which reported the existence of evidence of hydrocarbons.

An announcement made by BG Group states that the drilling of thesecond well has not been completed yet and that it cannot comment on the results as of yet. BM-S-52 is explored by the consortium formed by Petrobras (60 %) and BG Group (40 %, the operator during the exploratory phase).
Petrobras believes that the occurrence of dry wells, outside of the oil industry's normal standards, is unlikely in this pre-salt area of the Santos Basin on account of the knowledge regarding the geological models, of the amount of seismic data available, and of the amount of wells that have already been drilled there successfully.

Petrobras ratifies the information the company announced on October 01 and 15 2008, in which it clarifies that although the notification of evidence of hydrocarbons is a positive piece of information, it does not imply in a commercial oil or gas discovery. A field can only be declared commercial after the commerciality statement has been sent to and approved by the NPA.
Finally, the company clarifies that thus far no statement of commerciality has been sent to the NPA for the Santos and Campos Basins' pre-salt area.