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Gran Tierra Energy Announces Successful Oil Flow Tests In Colombia And Argentina

As drilling continued, a second fault was crossed and another repeated oil-bearing Caballos Sandstone reservoir section was encountered in a new, previously unrecognized fault block.  It had 139 feet TVD of gross reservoir or 60 feet TVD of net reservoir thickness.  The interval from 7,680 feet to 7,790 feet MD was perforated and tested for 13 hours with a hydraulic jet pump at 316 BOPD of 26.5° API oil with a 2.8% water cut.

Moqueta-7 bottom hole location is believed to be near the western extremity of the main block of the Moqueta field.  The well, because of its bottom hole position, will be completed as a water injector for pressure maintenance to enhance oil recovery and production from producing wells in the main block.

Initial drilling results have been obtained from the Moqueta-8 appraisal well, with a bottom-hole location 450 meters southeast of the Moqueta-5 producing well. Oil shows encountered during drilling indicate the presence of oil-bearing reservoir sandstones in the Villeta U Sandstone beginning at 4,865 feet MD (4,283 feet TVD) with an approximate potential gross reservoir thickness of 40 feet MD (32 feet TVD). The Villeta T Sandstone with oil shows were encountered at 5,152 feet MD (4,515 feet TVD) with an approximate potential gross reservoir thickness of 106 feet MD (70 feet TVD). The underlying Caballos formation with oil shows was encountered at 5,350 feet MD (4,674 feet TVD) with approximately 260 feet MD (97 feet TVD) of potential gross thickness.

Gran Tierra Energy is planning to conduct the initial testing for Moqueta-8 in January 2013.  Moqueta-9, the next well in the appraisal program to further define the reserve potential of the field, is expected to begin drilling in February 2013.

Argentina

Puesto Morales Block, Neuquen Basin (100% working interest and operator)

The PMN-1117 horizontal well reached a total depth of approximately 2,130 meters MD (1,408 meters TVD) on October 27, 2012.  The well was drilled with a 483 meter horizontal section and multi-stage fracture stimulation was conducted on the well with production testing initiated on December 2, 2012.  During the first 24 hours, this well flow tested at a rate of approximately 840 BOPD from the tight oil Loma Montosa reservoir.  This well is currently flowing naturally at a choke-restricted rate of 212 BOPD of 33.8° API oil with a 0% water cut.

Peru 

Block 95 (100% working interest and operator subject to PeruPetro S.A. and Peruvian Government approvals)

Gran Tierra Energy began drilling the Bretaña Norte 95-2-1XD exploration well in Block 95 on December 15, 2012.  This well will continue drilling into the first quarter of 2013, with initial results expected at the end of the quarter. The bottom-hole target is located approximately 3.7 kilometers south of the Bretaña-1 well, which was drilled in 1974 and tested 18° API gravity oil on natural flow rates of approximately 807 BOPD. Gran Tierra Energy Peru S.R.L. currently holds a 60% working interest in Block 95 and has entered into an agreement to purchase the remaining 40% working interest from Global Energy Development PLC. Subject to PeruPetro S.A. and Peruvian Government approvals, Gran Tierra Energy will have a 100% working interest in Block 95.

In its press release dated June 11, 2012, Gran Tierra Energy announced the results of a contingent gross lease resource estimate for the oil discovery on Block 95, provided by its independent reserves auditor, GLJ Petroleum Consultants effective June 1, 2012. The resource estimate has been prepared in compliance with National Instrument 51-101 - Standards of Disclosure for Oil and Gas Activities and the Canadian Oil and Gas Evaluation Handbook.  The estimates included a low estimate "1C" contingent resources of 11.5 million stock tank barrels of oil (" MMSTB"), a best estimate "2C" contingent resources of 31.6 MMSTB, and a high estimate "3C" contingent resources of 88.1 MMSTB.  In addition to evaluating the reservoir with discovered oil, the well will explore deeper horizons for additional potential pay zones.  Additional information respecting such contingent resource estimates is included in the June 11, 2012 press release. There is no certainty that it will be commercially viable to produce any portion of the resources.

Blocks 123 and 129 (100% working interest, subject to government approval, and operator)

PeruPetro S.A. has approved Gran Tierra Energy Perú S.R.L. assumption of operatorship of Blocks 123 and 129, located on the eastern flank of the prolific Marañon Basin of northern Peru, effective January 1, 2013.  Assumption of 100% working interest is pending government approval.

Brazil

The 1-GTE-05HP-BA horizontal oil exploration well on Block 142 onshore Recôncavo Basin Brazil has been drilled, the horizontal liner has been set and the multi-stage fracture stimulation is planned for February, 2013. The 1-GTE-06HP-BA horizontal sidetrack on Block 129 spud January 4, 2013 and planning continues for the 1-GTE-07HP-BA horizontal oil exploration well on Block 155, with operations expected to commence in first quarter and be completed in the second quarter of 2013.

About Gran Tierra Energy Inc.

Gran Tierra Energy is an international oil and gas exploration and production company, headquartered in Calgary, Canada, incorporated in the United States, trading on the NYSE MKT (GTE) and the Toronto Stock Exchange (GTE), and operating in South America. Gran Tierra Energy holds interests in producing and prospective properties in Colombia, Argentina, Peru, and Brazil. Gran Tierra Energy has a strategy that focuses on establishing a portfolio of producing properties, plus production enhancement and exploration opportunities to provide a base for future growth.

Gran Tierra Energy's Securities and Exchange Commission filings are available on a web site maintained by the Securities and Exchange Commission at http://www.sec.gov and on SEDAR at http://www.sedar.com.

Forward Looking Statements and Advisories

Readers are cautioned that the well-flow test results disclosed in this press release are not necessarily indicative of long term performance or of ultimate recovery.

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