PETRÓLEO BRASILEIRO S.A. - PETROBRAS

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Material Fact

Petrobras’ Proven Reserves in 2013

Rio de Janeiro, March 7^th, 2014 – Petróleo Brasileiro S.A. - Petrobras announces the volume of its proven petroleum (oil and condensate) and natural gas reserves, assessed at the end of 2013 according to the Securities and Exchange Commission - SEC criteria.

Petrobras’ Proven Reserves in 2013

On December 31^st, 2013, Petrobras’ proven oil, condensate and natural gas reserves reached 13.123 billion barrels of oil equivalent (boe), which represents an increase of 1.9% from 2012, as shown:

Volumes of Proven Reserves (SEC criteria) in 2013

During 2013, 1.218 billion boe were added to proven reserves. In that year, interests in fields with proven reserves amounting to 0.118 billion boe were sold. The balance between appropriations and sales resulted in an increase of 1.100 billion boe to proven reserves, against a production of 0.861 billion boe. These volumes do not take into account the production of Extended Well Tests (EWTs) in exploratory blocks in Brazil or the production in Bolivia since the Bolivian Constitution prohibits the disclosure and registration of its reserves. The evolution of the proven reserves, according to SEC criteria, is shown:

Evolution of Proven Reserves (SEC criteria) in 2013

For each barrel of oil equivalent extracted in 2013, 1.28 barrel was appropriated, resulting in a Reserve Replacement Index (RRI) of 128%. In 2013, the Reserve/Production (R/P) ratio was 15.2 years, as shown below:

Reserve Indicators (SEC criteria) in 2013

The highlights of 2013, in terms of the proven reserves in Brazil, were:

• Declaration of commerciality at two Transfer of Rights areas of the Santos Basin pre-salt – Búzios field (Franco) and Sul de Lula field (Sul de Tupi):

­   A volume of 0.720 billion boe was appropriated to proven reserves in 2013 from these fields, corresponding to 23% of the volume contracted for these areas;

­   Petrobras has the right to extract up to 5 billion boe of petroleum from certain pre-salt areas acquired in 2010 through the Transfer of Rights Agreement. These new fields include the right to extract 3.186 billion boe, of which 3.058 billion boe from Búzios and 0.128 billion boe from Sul de Lula;

­   The remaining contracted volume for these two fields will be appropriated to proven reserves as projects are implemented.

• Declaration of commerciality of Lapa field (Carioca), in the Santos Basin pre-salt, under the concession regime;

• Declaration of Commerciality of Baúna Sul field, in Santos Basin, and Paturi and Maçarico fields, in the Potiguar Basin;

• Incorporation of volumes related to the discovery of new accumulations near existing infrastructure, as a result of the on-going success of exploratory activities in different Brazilian basins:

­   For the pre-salt, in the Albacora, Caratinga and Marlim Leste fields, in Campos Basin;

­   For the post-salt, in the Piracaba field, in Santos Basin, in the Taquipe and Araçás fields, in the Recôncavo Basin, and in the Rio Urucu field, in the Solimões Basin.

• Growth of proven reserves in the pre-salt due to increased well drilling activity and positive responses of production systems in operation, both at Santos and Campos Basins. Of this additional reserves, 62% came from the concessions of Lula, Lula – Iracema Area and Sapinhoá, in Santos Basin and 38% from the concessions of Parque das Baleias and Marlim Leste, in Campos Basin;

• Better recovery factor in Marlim Sul, Tartaruga Verde and Tartaruga Mestiça fields, in Campos Basin, and Leste de Urucu field, in the Solimões Basin;

• These appropriations offset the sale of Petrobras´ interests in the Atlanta and Oliva concessions, in Santos Basin, as well as in Parque das Conchas (Argonauta, Abalone, Náutilus and Ostra Concessions), in Campos Basin.

The highlights of 2013, in terms of Petrobras’ proven reserves abroad, were:

• Sale of 50% of the assets in Africa, by creating a joint venture for oil, condensate and natural gas exploration and production, and of interests in fields in the US Gulf of Mexico, amounting to 0.073 billion boe;

• Appropriations due to the extension of concessions in Argentina and of the execution of the well campaign planned for onshore fields in Argentina and offshore fields in the US Gulf of Mexico.

Petrobras clarifies that the properties of the hydrocarbon reserves belong to their respective Nation States.