CALGARY, Alberta, December 20, 2010, Gran Tierra Energy Inc. ("Gran Tierra Energy") (NYSE Amex: GTE, TSX: GTE), a company focused on oil exploration and production in South America, today announced a 2011 capital spending program of US$299.2 million for exploration and production development operations in Colombia, Peru, Argentina and Brazil. The capital spending program includes US$146.9 million allocated for drilling and completions, $74.4 million for facilities, equipment, pipelines and other costs, and US$77.9 million for seismic activities.  This budget includes the drilling of ten wells in Colombia, three wells in Peru, two wells in Argentina and six wells in Brazil. The approved 2011 budget also includes funds for 370 km of 2D and 495 km² of 3D seismic acquisition programs in Colombia, Peru, Argentina and Brazil, primarily in preparation for additional exploration and production drilling operations in 2012.

 

The net risked prospective resource potential of the 2011 exploration program totals approximately 130 million barrels of oil, with the Valle Morado delineation well targeting a net risked prospective resource potential of approximately 120 billion cubic feet of gas.

 

Excluding potential exploration success, production in 2011 is expected to range between 21,500 to 23,500 barrels of oil equivalent per day ("BOEPD") gross, or 16,000 to 18,000 BOEPD net after royalty.

 

Gran Tierra Energy had US$308.4 million in cash and equivalents at the end of the third quarter 2010 and has no debt. The 2011 work program and budget is expected to be funded from cash-flow from operations with the balance from cash on hand as necessary.

 

"Gran Tierra Energy greatly expanded its land position in 2010, while retaining an exceptionally strong balance sheet, positioning the company to undertake its most ambitious exploration program to date," said Dana Coffield, President and Chief Executive Officer of Gran Tierra Energy. "A number of our exploration wells budgeted for 2010 have slipped into 2011 due to a variety of regulatory and operational delays. These are planned to be drilled early in 2011 and are being complemented with additional new exploration drilling opportunities. In addition, development drilling and new facilities construction is intended to bring on new production from new reserves found in 2010. Finally, an extensive seismic program is being acquired in all four countries in preparation for continued exploration and development activities in 2012 and beyond."

 

 

The Colombia capital budget for 2011 is planned to be US$147.8 million. Facility construction associated with ongoing development of the Moqueta field along with further facility work at Costayaco, in addition to other work, is expected to be US$30.1 million. US$53.0 million is budgeted for seismic acquisition and US$64.7 million is budgeted for exploration and development drilling. During 2011, Gran Tierra Energy expects to drill four gross exploration wells, two stratigraphic test wells, four gross development wells, and acquire in excess of 440 km² of 3D seismic and 370 km of 2D seismic in Colombia. The six well exploration program has a net risked resource potential of approximately 15 million barrels of oil.

Gran Tierra Energy is the largest exploration landholder in the Putumayo Basin of southern Colombia, with working interests in 10 exploration and production licenses pending Colombia's National Hydrocarbon Agency approval on the Putumayo 10 block. Total acreage encompasses 719,321 gross acres or 559,844 net acres. 

 

 

With the successful discovery of oil at Moqueta in 2010, new infrastructure construction is planned for the field including further appraisal with two wells, Moqueta-5 and Moqueta-6, construction of a six inch diameter, 8 km long flow line to Costayaco, gas reinjection facilities, road access construction and full field development planning. 

 

Seismic acquisition is planned to continue on the Chaza block to further delineate the Moqueta field and to evaluate new prospects along trend with Moqueta.

 

Gran Tierra Energy intends to drill the Canangucho-1 exploration well to the east of the Costayaco field in the first quarter of 2011.

 

Development drilling in the Costayaco field is planned to include one horizontal water injector, Costayaco-14 on the western flank of the field to provide additional pressure support for the T Sandstone and to increase water disposal capacity.

 

 

Rumiyaco-1, Gran Tierra Energy's first exploration well in the block, is expected to be spud in the second quarter, 2011.  

 

Gran Tierra Energy plans to begin drilling the La Vega Este-1 exploration well in the third quarter of 2011.

 

Gran Tierra Energy intends to drill a stratigraphic test well on the Piedmonte Norte block in the third quarter of 2011. 

 

Gran Tierra Energy intends on drilling a stratigraphic test well on the Putumayo-10 block in the fourth quarter of 2011.

 

Gran Tierra Energy intends on drilling a development well, Juanambu-3, in the Juanambu Field in the first quarter of 2011. 

 

Plans to drill a second exploration well on the Garibay Block, Melero-1, are  currently underway with the operator of the block intending to begin drilling in the second quarter of 2011.

Gran Tierra Energy has accumulated a large land position in Peru, encompassing approximately 11.4 million gross acres or 5.5 million net acres on 6 blocks in the Mara on Basin. The Peru budget of $55.9 includes drilling three exploration wells with drilling costs anticipated to be US$34.2 million and approximately US$19.2 million budgeted for seismic work. Gran Tierra Energy is targeting a net risked resource potential of 105 million barrels of oil in Peru. 

 

These blocks are located on the eastern flank of the Mara on Basin of northern Peru, and encompass 3.4 million acres of land over the crest and flanks of the Iquitos Arch. To date, more than one billion barrels of recoverable oil has been discovered in the adjacent Mara on Basin. Gran Tierra Energy plans to begin drilling the first exploration well, Kanatari-1, in Block 128 in January, 2011. This is expected be followed by a second exploration well, Pichico-1, on Block 122 in the third quarter of 2011.

 

 

Seismic acquisition and processing is planned to continue in 2011 in Blocks 123, 124 and 129, with exploration drilling environmental impact assessments to be conducted concurrently in blocks 123 and 129.

 

Upon approval of assignment of interests to Gran Tierra Energy by PeruPetro, Gran Tierra Energy plans to drill one exploration well in Block 95 in the fourth quarter of 2011. The contract area contains the Breta a-1 well, which was drilled in 1974 and tested 18 API gravity oil on natural flow rates of approximately 800 barrels of oil per day.

 

 

Gran Tierra Energy is the largest exploration landholder in the Noroeste Basin of northern Argentina. Gran Tierra Energy has a working interest in seven blocks of land it operates, encompassing approximately 1.6 million gross acres, or 1.3 million net acres.

 

Argentina's capital budget of US$39.8 million includes US$30.6 million allocated to drilling and US$7.3 million associated with facility construction, and US$1.9 million in geological and geophysical work. Drilling capital includes capital to conclude drilling the VM.x-1001 initiated late in 2010, in addition to one development well planned to be drilled in the Palmar Largo oil field and one development well planned to be drilled in the Surubi oil field in the first and third quarters respectively. 

In the Valle Morado block, the re-entry and sidetrack of the VM.x-1001 well is ongoing and expected to conclude in March, 2011. The sidetrack well is being drilled to test the resource potential discovered by the VM.x-1001 well. Existing pipeline and gas processing plant capacity is capable of handling 30 million standard cubic feet of gas per day.

 

With potential success at the VM.x-1001 well, Gran Tierra Energy's Argentina production could grow to approximately 3,000 BOEPD net after royalty in the fourth quarter of 2011.  Gran Tierra Energy is targeting a net risked resource potential of 120 billion cubic feet of gas in Valle Morado.  

Upon the anticipated regulatory approval from Brazil's Ag ncia Nacional de Petr leo, G s Natural e Biocombust veis ("ANP"), Gran Tierra Energy will become the operator and hold a 70% working interest in Blocks REC-T-129, -142, -155 and -224 in the onshore Rec ncavo Basin. Gran Tierra Energy has budgeted US$54.7 million for Brazil with US$17.4 million budgeted for drilling and completions. 

 

Upon approval from the ANP, Gran Tierra Energy expects to spud the first conventional light oil exploration well in Block 129 in the second quarter, 2011. This is planned to be followed by up to three additional exploration wells including two wells on Block 142 and one well on Block 155. This program is targeting a net risked resource potential of 10 million barrels of oil. In addition, 2 development wells are planned on Block 155 in an existing light oil discovery with an estimated unaudited gross recoverable resource of 6 million barrels of oil.

 

 

The Pacayaco-1 exploration well in the Chaza Block has reached 9,910 feet measured depth without encountering the expected target reservoir sandstones. An unexpectedly thick Villeta shale section was encountered, with thin sandstone and limestone intervals encountered that had poor to fair oil shows. Hole integrity and drilling issues did not allow drilling to continue deeper. The results are inconsistent with the existing 2D seismic interpretation, so the well has been suspended until the acquisition of new 3D seismic over the prospect is completed in January and subsequently interpreted. A decision will then be made whether to deepen or sidetrack the well to a more optimal bottom-hole location.

 

Location construction for the Canangucho-1 exploration well in the Chaza Block is ongoing. Drilling is expected to commence in January, 2011.

 

Mobilization of the rig to drill the Moqueta-4 delineation well in the Moqueta oil discovery, also in the Chaza Block, is ongoing with drilling expected to commence in late December.

 

Mobilization of the rig to drill the Taruka-1 exploration well in the Piedemonte Sur Block is ongoing with drilling expected to commence in late December.

 

 

Location construction for the Kanatari-1 exploration well in Block 122 is nearing completion and rig mobilization is planned to begin in late December. Drilling is expected to commence in mid-January, 2011. Seismic acquisition operations are ongoing in Block 122.

 

A 900 km 2D seismic acquisition program is ongoing in Blocks 123 and 129.

 

 

Drilling of the VM.x-1001 sidetrack in the Valle Morado gas field is continuing at approximately 10,600 feet measured depth; drilling is expected to be completed in February, 2011. Testing is expected to commence in the second quarter of 2011.

 

 

A new 93 km² 3D seismic acquisition survey covering Blocks REC-T-129, -142 and -155has been completed and is currently being processed, as reported by the block's concessionaire Alvorada Petr leo. This newly acquired seismic data is expected to be used to finalize two development and four exploration well locations for drilling in 2011.

 

 

 

Additional information concerning Gran Tierra Energy is available at www.grantierra.com, on SEDAR (www.sedar.com) and with the Securities and Exchange Commission (www.sec.gov).