Americas Petrogas, Gran Tierra Hit Oil Pay in Argentina

Americas Petrogas announced Monday that it, along with its co-venturer, Gran Tierra Energy, have made a new significant discovery of oil (1,023 barrels of oil equivalent per day) in the 1st of the three exploration wells on the Rinconada Norte block located in the Neuquen Basin of Argentina (Americas Petrogas Argentina S.A. is operator).

The RN x-1004 well flowed a total combined test rate of approximately 944 barrels (150 m3) per day of oil and 13,360 m3 per day of gas (79 barrels of oil equivalent per day) for a total of approximately 1,023 barrels of oil equivalent per day from two intervals tested separately in the Precuyo formation. This well also flowed 43 barrels (5 m3) per day of water or a 4% water cut.

From the depths of the zones tested (982-992 meters and 1022-1032 meters) and electric logs information, the Company estimates an oil column thickness of approximately 60 meters or 197 feet. The oil is 29.6 degrees API, sweet light crude similar to crude oil produced from the equivalent formation in Americas Petrogas' Medanito Sur block. This well has been completed and the service rig will now move on to the next two wells, which have already been drilled, logged and production casing has been installed. Americas Petrogas' wholly-owned Argentina subsidiary, Americas Petrogas Argentina S.A., is the operator of the Rinconada Norte block, holding a 65% working interest, while Gran Tierra Energy, through its Argentina subsidiary, holds a 35% working interest.

Commenting on this most recent discovery, Guimar Vaca Coca, Managing Director of Americas Petrogas Argentina S.A., stated, "We are very excited about this new find on the first well of this three-well exploratory drilling program because of the strong production rates and possibility of significant commercial reserves. We are also optimistic about the prospects for the remaining two wells."

The Rinconada Norte block is currently under an Exploitation concession, which will allow Americas Petrogas and Gran Tierra Energy, with previous approvals from the authorities, to move ahead with development activities in the near term. The Company anticipates building test production facilities in the fourth quarter of 2011. This drilling program on Rinconada Norte represents the initial phase of Americas Petrogas' previously-announced drilling plans for 2011-2012 (see press release of June 3, 2011).

The Rinconada Norte block (approximately 96 or 37 sections) is located immediately south of and adjoins Americas Petrogas' Medanito Sur block in La Pampa Province in the eastern region of the Neuquen Basin of Argentina.

Barclay Hambrook, President & CEO of Americas Petrogas, stated, "We are very pleased with this discovery and Americas Petrogas is well-funded to accelerate and expand its planned capex program in order to increase production and reserves."


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