Gran Tierra Energy Inc. · AMEX:GTE

Gran Tierra Energy — Investor Presentation (July 2007)

28 slides from Gran Tierra Energy's investor presentation, Jul 24, 2007

  1. Slide 1: Corporate Presentation July 2007

    GranTierra energy inc. Corporate Presentation July, 2007

  2. Slide 2: Forward-looking statements

    This presentation material contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The opinions, forecasts, projections, statements of resource potential or other statements,

  3. Slide 3: Gran Tierra Energy: International E&P Growth Story

    » Gran Tierra Energy International E & P Growth Story International oil and gas exploration and production company (OTCBB:GTRE) Strategy: Acquire underdeveloped assets, create value by drilling ~ Balanced portfolio of production enhancement and exploration drilling opportunities - Lower risk, predic

  4. Slide 4: Management — Global Experience

    ) Management — Global Experience = Dana Coffield, PhD, President & CEO Previously EnCana International and ARCO Intemational * Martin Eden, CFO - Previously Artumas Group, Nexen, Emst & Young = Max Wei, VP Operations = Previously EnCana international, Occidental * Rafael Orunesu, President, GTE Arge

  5. Slide 5: Board of Directors – Proven Track Record

  6. Slide 6: Operations by country: Colombia, Argentina, Peru

    Calgary - Goffice staff Colombia = Working interests in 9 E&P Contracts, 3 producing = Alloperated by Gran Tierra ~ 522 BOPD (1H 2007) plus exploration = 1,191,498 gross acres (956,608 net) - 21 office staff, 95 field personnel Argentina = Working interests in 8 E&P Contracts, 4 producing = Allopera

  7. Slide 7: Scientific

    entific

  8. Slide 8: Colombia – 2007 Exploration Discoveries Juanambu-1 and Costayaco-1

  9. Slide 9: Colombia — New Acreage

    D)) Colombia — New Acreage Technical Evaluation Agreements (TEAs) Juanambu discovery Costayaco discovery Putumayo A Putumayo |. 4,409 km?, 570,000 acres + Seismic reprocessing (400 km 20) & geologic studies + 12 months Putumayo B 440 km?, 109,000 acres + Seismic reprocessing (100 km 2D) & geologic s

  10. Slide 10: Core

    Coc

  11. Slide 11: Argentina - 2007 Deeper Pool Test

    Argentina - 2007 Deeper Pool Test Puesto Climaco-2D Puesto Climaco-2D, Vinalar Block Completed January, 2007 Deeper pool test beneath existing Puesto Climaco oil field Low risk, predictable results Reached target by drilling out from existing well bore Tested up to 2,825 BOPD (gross before royalty)

  12. Slide 12: Peru – Land Position Marañon Basin

  13. Slide 13: Marañon Basin

    Marafion Basin Proven basin, new concept = Gran Tierra testing new concept in Marafion Basin + Acreage on regional high, termed ‘peripheral bulge’ or foreland bulge’ + High acts as regional focal point for petroleum migration "= Marafion Basin contains a proven prolific petroleum system = Analogous

  14. Slide 14: Financial Snapshot

    )\ -; : D) Financial Snapshot * Basic shares - 94.5 million = Directors and officers: 17% = Institutional: Approximately 40% = Fully diluted shares - 134.0 million = 34.4 million warrants = 3.4 million stock options * Public Financings = $12 million @ $0.80/share (2005); acquisition financing = $75

  15. Slide 15: Growth - Land

    Gross Acres # Blocks Growth - Land 2005 2006 1HO7 Current Acreage * 19 blocks in 3 countries - Argentina, Colombia and Peru * 18 operated by Gran Tierra * 6.5 MM gross acres = 58MMnet acres Changes in Q2 2007 + Relinquished Primavera Block = Stranded legacy asset = Minority interest (15%) — 2 dry ho

  16. Slide 16: Growth - Reserves

    ) Growth - Reserves Wor Reverves Net Reserves™* 7.1 MMBO"* (Dec. 31, 2006) I = 3.0 MMBO Proved cose = 1.2MMBO Probable = 2.9MMBO Possible 0.7 MMBO* —= 2007 reserve additions are currently under evaluation by independent reserve engineers Manin Barrels OM Cquivaent From extemal reserve auditors: *Dec

  17. Slide 17: Growth - Production

    Growth - Production Production (net after royalty) 2005 2006 1HO7 Argentina Colombia CULL) ey (acquisitions) BOPD Argentina (acquisitions) Production is currently approximately 1,400 BOPD net after royalty with the recent onset of initial production from Costayaco and Juanambu discoveries

  18. Slide 18: 2007 Drilling Program

    -)) 2007 Drilling Program * Original 2007 work program: 10 exploration wells plus workovers + 2.9 mmbbI net risked resource potential, 1,587 b/d net risked production add (fully developed) + Finding cost $4.67/0bI risked eer indor runlocimece? Aigening = R_heoweey ler too oust comso mayne” 'Ger —Rom

  19. Slide 19: Growth — Future potential

    Growth — Future potential il Prospective Resource Potential (ton cose Font os Prospective Resource Potential” 61 prospects and leads 16 MMBO risked (79 MMBO unrisked) 96 BCFG risked (336 BCFG unrisked) Excludes 2007 drilling program Charts exclude Peru; two leads in Peru have 500 MMBO unrisked resou

  20. Slide 20: Gran Tierra Energy: Base, Value Creation, Next Steps

    Dy Gran Tierra Energy = Our Base Today = Established South American platform (Colombia, Argentina, Peru) ~ 19 blocks, 6.5 MM gross acres - Approximately 1,140 BOPD net after royalty production (1H 2007) ~ Approximately 3.0 MMBO net after royalty proved reserves (at Dec. 31, 2007) = Value Creation -

  21. Slide 21: Back-up

  22. Slide 22: Colombian Operating Netbacks Per BO

    D)) Colombian Operating Netbacks Per BO Risk Sharing Contract (Santana) wT $60.00 $70.00 $80.00 WTI Discount (1) $12.30 $13.25 $13.25 Royalty (20%) $ 9.54 $11.35 $13.35 Operating costs (2) $8.44 $8.44 $8.44 Operating netback before tax $29.72 $36.96 $44.96 ‘Colombian income tax rates: 34% in 2007: 3

  23. Slide 23: Colombian Operating Netbacks Per Bbl

    D)) Colombian Operating Netbacks Per Bbl Association Contract (Guayuyaco) wT $60.00 $70.00 $80.00 WTI Discount (1) $12.30 $13.25 $13.25 Royalty (8%) $ 3.82 $ 4.54 $ 5.34 Operating costs (2) £9.01 £9.01 $9.01 Operating netback before tax $34.87 $43.20 $52.40 <5 million BO gross production = Ecopetrol

  24. Slide 24: Colombian Operating Netbacks Per BO

    D)) Colombian Operating Netbacks Per BO Association Contract (Juanambu) wT $60.00 $70.00 $80.00 WTI Discount (1) $12.30 $13.25 $13.25 Royalty (8%) $ 3.82 $ 4.54 $ 5.34 Operating costs (2) $7.50 $750 $7.50 Operating netback before tax $36.38 $44.71 $53.91 <5 milion BO gross production + Ecopetrol wil

  25. Slide 25: Colombian Operating Netbacks Per BO

    Dy Colombian Operating Netbacks Per BO ANH Contract (Chaza) wT $60.00 $70.00 $80.00 WTI Discount (1) $ 8.44 $ 8.44 $ 8.44 Primary royalty (8%) (2) $ 4.12 $ 492 $ 5.72 Economic Rights $ 0.10 $ 0.10 $ 0.10 Operating costs (3) $850 $850 $850 Operating netback before tax $38.84 $48.04 $57.24 <5 milion B

  26. Slide 26: Argentina Operating Netbacks Per BO

    D)) Argentina Operating Netbacks Per BO Palmar Largo wT $60.00 $70.00 $80.00 WTI Discount (1) $22.00 $29.35 $36.70 Provincial Sales Tax (1.5%) $ 0.57 $ 0.61 $ 0.65 Royalty (12%) $ 5.20 Operating costs (2) S115 S115 Operating netback before tax $21.36 $23.65 $25.94 Argentina income tax rates: 35% (1)

  27. Slide 27: Argentina Operating Netbacks Per BO

    D)) Argentina Operating Netbacks Per BO Chivil wT $60.00 $70.00 $80.00 WTI Discount (1) $22.00 $29.35 $36.70 Provincial Sales Tax (1.5%) $ 0.57 $ 0.61 $ 0.65 Royalty (12%) $ 4.56 $ 4.88 $ 5.20 Operating costs (2) $13.67 $13.67 $13.67 Operating netback before tax $19.20 $21.49 $23.78 Argentina income

  28. Slide 28: Argentina Operating Netbacks Per BO

    D)) Argentina Operating Netbacks Per BO Vinalar wT $60.00 $70.00 $80.00 WTI Discount (1) $21.89 $29.24 $36.59 Provincial Sales Tax (1.8%) $ 0.69 $ 0.73 $ 0.78 Royalty (12%) $ 457 $ 489 $ 5.21 Operating costs (2) S555 £555 $5.55 Operating netback before tax $27.30 $29.59 $31.87 Argentina income tax r

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