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Petrobras Discovers More Light Oil in the Campos Basin; Preliminary Analysis Suggests ~280M Barrels Recoverable

Petrobras announced a new oil discovery the Campos Basin post-salt layer (carbonate reservoirs), with the drilling of well 1-BRSA-713-RJS (1-RJS-661), informally known as Aruanã, in Exploratory Concession BM-C-36 (block C-M-401), which is operated exclusively by Petrobras.

The Aruanã discovery in the Campos Basin. Click to enlarge.

Preliminary analyses indicate not only the presence of recoverable volumes of some 280 million barrels of light oil (28° API), but also good productivity. Block BM-C-36 was acquired in the seventh round of bidding held by the National Petroleum Agency (ANP) on October 17 and 18 2005.

The discovery well is located nearly 120 km off the coast of Rio de Janeiro and at a water depth of 976 meters. The discovery was proved based on assessments (lined well formation test) in reservoirs located at depths ranging from 2,993 to 3,123 meters. The discovery will then be the object of an Assessment Plan to be submitted to the ANP.

The discovery is northeast of, and in shallower waters than, the massive new oil province discovered several years ago of which the Tupi area, which represents only a small part of the new region, has a recoverable volume of between 5 to 8 billion barrels of oil and natural gas. (Earlier post.)

Marlim Sul. Also in the Campos Basin, in the Marlim Sul Field, in reservoirs geologically similar to the new Aruanã discovery, Petrobras drilled wells 6-MLS-122-RJS (Jurará) and 6-MLS-146 D-RJS (Muçuã), in 2007 and 2009, respectively, at water depths of 1,200 m. These wells allowed for joint estimations of 350 million recoverable barrels of 27° API oil. The development of these project has been foreseen in the 2009-2013 Strategic Plan, and early production is being deployed at platform P-51, which already produces oil in the area, and, in 2011, at platform P-56, which is currently under construction.

Marlim Leste. Petrobras has already amassed knowledge about this type of reservoir though its exploration of the Marlim Leste field, by means of well 6-MLL-14-RJS, informally known as Jabuti (2005). In waters at a depth of 1,300 meters and at 120 km off the coast, this well identified a reservoir with a recoverable volume of some 345 million barrels of recoverable 28° API. The first oil of this reservoir was produced in 2008 with the FPSO Seillean platform.

Petrobras expects the joint production of these areas to make short- and medium-term contributions to its production curve, as production and drainage structures are already installed there. The Jabuti and Jurará discoveries have already been included in Petrobras’ Proved Reserves for 2008.


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