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Gran Tierra Energy Inc. Announces 2015 Year-End Reserves and Combined Pro Forma Reserves and Resources

January 21, 2016 7:31 AM EST

CALGARY, ALBERTA -- (Marketwired) -- 01/21/16 -- Gran Tierra Energy Inc. ("Gran Tierra" or the "Company") (NYSE MKT: GTE)(TSX: GTE), a company focused on oil exploration and production in Colombia, today announced the Company's 2015 year-end estimated reserves as evaluated by the Company's independent qualified reserve evaluator McDaniel & Associates Consultants Ltd. ("McDaniel") in a report with an effective date of December 31, 2015 (the "GTE McDaniel Reserves Report"). Subsequent to year-end 2015, on January 13, 2016, the Company completed its acquisition of all the issued and outstanding common shares of Petroamerica Oil Corp. ("Petroamerica") and expects to complete its acquisition of all the issued and outstanding common shares of PetroGranada Colombia Limited ("PGC") on or about January 25, 2016. Gran Tierra is also announcing pro forma combined reserves and resources that have resulted from the Petroamerica acquisition and are expected to result from the PGC acquisition.

All dollar amounts are in United States ("U.S.") dollars, unless otherwise indicated. Unless otherwise expressly stated, all reserves values contained in this press release have been calculated in compliance with Canadian National Instrument 51-101 - Standards of Disclosure for Oil and Gas Activities ("NI 51-101") and the Canadian Oil and Gas Evaluation Handbook ("COGEH"). For reserves values calculated in compliance with SEC rules, see "Reserves Reported in Accordance with United States Reporting Requirements" below in this press release.

Message to Shareholders

Gary Guidry, President and Chief Executive Officer of Gran Tierra, commented "Gran Tierra's mature legacy assets have performed as expected providing stable cash flow and production. Including the completed acquisition of Petroamerica which occurred subsequent to year-end, and the acquisition of PGC, which is expected to be completed on or about January 25, 2016, the Company's Proved plus Probable ("2P") working interest ("WI") reserves increased by 14% compared with year-end 2014. In addition, as a result of the Petroamerica and PGC acquisitions, Gran Tierra's unrisked net Prospective Resources are expected to increase to 681.7 million barrels of oil equivalent ("MMBOE ") (36% increase) and risked Prospective Resources to 178.2 MMBOE (50% increase) in Colombia compared with the Company's Prospective Resources as at September 30, 2015."

Highlights


--  Annual production for 2015 averaged 23,401 company interest barrels of
    oil equivalent per day ("BOEPD") before royalties, or 19,489 BOEPD net
    after royalty.
--  Year-end 2015 WI oil and gas reserves based on NI 51-101 and COGEH:
    --  Proved reserves ("1P") increased 7,251 thousand barrels of oil
        equivalent ("MBOE") from year-end 2014, before production, due to
        technical and economic revisions. In Brazil, 1P reserves increased
        by 83% based on reservoir performance. After production of 8,542
        MBOE, year-end 2015 1P reserves were 48,350 MBOE compared to 49,100
        MBOE at year-end 2014;
    --  2P reserves increased 7,025(1) MBOE from year-end 2014 due to
        technical and economic revisions. In Brazil, 2P reserves increased
        based on reservoir performance and budgeted plans to implement water
        injection. After production of 8,542 MBOE, year-end 2015 2P reserves
        were 65,962 MBOE compared to 66,939(1) MBOE year-end 2014;
    --  Proved plus Probable plus Possible ("3P") reserves were 81,009 MBOE
        after 2015 production a decrease of 8% from year-end 2014, excluding
        Peru reserves(1).
--  Year-end 2015 before tax net present values discounted at 10% for Gran
    Tierra's reserves based on NI 51-101 and COGEH:
    --  1P of $814.0 million compared to $1,111.3 million at year-end 2014
    --  2P of $1,100.5 million compared to $1,499.6 million at year-end 2014
    --  3P of $1,374.1 million compared to $2,038.9 million at year-end
        2014.
--  Combined year-end 2015 WI oil and gas reserves of Petroamerica and
    (subject to closing) PGC(2):

----------------------------------------------------------------------------
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                                      Volume   Net Present Value Before Tax,
Reserves Category                     (MBOE)   Discounted at 10% ($ million)
----------------------------------------------------------------------------
Proved                                 4,681                            47.6
Proved plus Probable                  10,267                           130.7
Proved plus Probable plus Possible    15,002                           233.3

--  Pro forma combined net asset value of $4.49 per share, based on before
    tax net present values discounted at 10% of 2P proforma combined
    reserves of the Company, Petroamerica and PGC, and estimated year-end
    2015 working capital, net of cash paid for the Petroamerica and PGC
    acquisitions, of $97.0 million. This estimated net asset value does not
    represent fair market value.
--  Pro forma Colombia WI Prospective Resources for Petroamerica and
    (subject to closing) PGC, and Gran Tierra Prospective Resources
    announced December 2015(3):

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                      Mean Unrisked              Mean Risked
                              Prospective Resources    Prospective Resources
                                            (MMBOE)                  (MMBOE)
----------------------------------------------------------------------------
Gran Tierra, year-end 2015                    501.1                    119.0
 Colombia Only
Combined Petroamerica and                     180.6                     59.2
 PGC, year-end 2015
                          --------------------------------------------------
TOTAL                                         681.7                    178.2
                          --------------------------------------------------
                          --------------------------------------------------
Change as a result of the              36% increase             50% increase
 Petroamerica and PGC
 acquisitions

__________________

(1) Excludes any reserves for Peru. On February 19, 2015, Gran Tierra made the decision to suspend all further development expenditures on the Bretana Field on Block 95 in Peru other than what was necessary to maintain tangible asset integrity and security. As a result of the decision to defer development, all probable and possible reserves associated with the field were reclassified as contingent resources.

(2) Based on the independent report prepared by McDaniel as of December 31, 2015 (the "PTA McDaniel Reserves Report") for Petroamerica and the independent report prepared by McDaniel as of December 31, 2015 (the "PGC McDaniel Reserves Report") for PGC. As the Petroamerica acquisition closed and the PGC acquisition is expected to close subsequent to year-end 2015, these reserves are expected to be consolidated during 2016. These reports and the GTE McDaniel Reserves Report have not yet been submitted to the Agencia Nacional de Hidrocarburos (National Hydrocarbons Agency) ("ANH").

(3) Based on the independent evaluation of Prospective Resources prepared by McDaniel as at September 30, 2015, with respect to Gran Tierra's Colombian properties (the "GTE McDaniel Prospective Resources Report"), the independent evaluation of Petroamerica's Prospective Resources prepared by McDaniel as at December 31, 2015 (the "PTA McDaniel Prospective Resources Report") and derived from the PTA McDaniel Prospective Resources Report as PGC owns the remaining 50% WI in the Putumayo-7 Block, the other 50% WI being owned by Petroamerica. These reports have not yet been submitted to the ANH.

Reserves Reported in Accordance with Canadian Reporting Requirements

The following tables summarize Gran Tierra's NI 51-101 and COGEH compliant reserves in Colombia and Brazil derived from the GTE McDaniel Reserves Report and a report prepared by GLJ Petroleum Consultants Ltd. ("GLJ") for Gran Tierra effective December 31, 2014 (the "GTE GLJ 2014 Reserves Report"), in each case calculated using forecasted oil and gas prices and costs. As noted above, probable and possible reserves associated with the Bretana field on Block 95 in Peru are excluded from the table below.


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Total Company                              2015 Year-End    2014 Year-End
----------------------------------------------------------------------------
Oil and Liquids                             WI Reserves   WI Reserves((iii))
(COGEH compliant)
----------------------------------------------------------------------------
Reserves Category                               Mbbl((i))          Mbbl((i))
----------------------------------------------------------------------------
Total Proved                                       47,475             48,920
Total Probable                                     17,124             17,222
                                          ----------------------------------
Total Proved plus Probable                         64,599             66,142
Total Possible                                     14,614             20,638
                                          ----------------------------------
Total Proved plus Probable plus Possible           79,213             86,780
----------------------------------------------------------------------------
----------------------------------------------------------------------------

((i))Mbbl (thousand barrels of oil).


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                              2015 Year-End    2014 Year-End
----------------------------------------------------------------------------
Gas                                         WI Reserves   WI Reserves((iii))
(COGEH compliant)
----------------------------------------------------------------------------
Reserves Category                              MMcf((ii))         MMcf((ii))
----------------------------------------------------------------------------
Total Proved                                        5,248              1,081
Total Probable                                      2,929              3,699
                                          ----------------------------------
Total Proved plus Probable                          8,177              4,780
Total Possible                                      2,597              3,144
                                          ----------------------------------
Total Proved plus Probable plus Possible           10,774              7,924
----------------------------------------------------------------------------
----------------------------------------------------------------------------
((ii))MMcf (million cubic feet)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                              2015 Year-End    2014 Year-End
----------------------------------------------------------------------------
BOE(COGEH compliant)                        WI Reserves   WI Reserves((iii))
----------------------------------------------------------------------------
Reserves Category                                    MBOE               MBOE
----------------------------------------------------------------------------
Total Proved                                       48,350             49,100
Total Probable                                     17,612             17,839
                                          ----------------------------------
Total Proved plus Probable                         65,962             66,939
Total Possible                                     15,047             21,162
                                          ----------------------------------
Total Proved plus Probable plus Possible           81,009             88,101
----------------------------------------------------------------------------
----------------------------------------------------------------------------

((iii)) On February 19, 2015, Gran Tierra made the decision to cease all further development expenditures on the Bretana field on Block 95 in Peru other than what is necessary to maintain tangible asset integrity and security. As a result of this decision, all probable and possible reserves associated with the field were reclassified as contingent resources. These probable and possible reserves are therefore excluded from the tables above.

Future Development Costs

The following table sets forth future development costs, excluding abandonment costs, deducted in the estimation of the future net revenue attributable to the reserve categories noted below (using forecast prices and costs):


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Year                     Proved Reserves                Proved Plus Probable
                                 ($000s)                    Reserves ($000s)
----------------------------------------------------------------------------
2016                              34,917                              58,440
2017                              17,848                              33,160
2018                               2,862                              24,005
2019                               1,220                              10,011
2020                               8,432                               1,882
Remaining                          3,824                               4,705
                     -------------------------------------------------------
Total (undiscounted)              69,103                             132,203
                     -------------------------------------------------------
                     -------------------------------------------------------

Before Tax Net Present Values

The following table summarizes before tax net present values for Gran Tierra's NI 51-101 and COGEH compliant reserves at year-end 2015.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                       Before Tax Net Present Value ($ million)
----------------------------------------------------------------------------
                                                  Discount Rate
                                    ----------------------------------------
                                    ----------------------------------------
                                          0%      5%     10%     15%     20%
------------------------------------========================================
Reserves Category
----------------------------------------------------------------------------
Total Proved                           1,222     981     814     693     603
Total Probable                           537     385     286     220     173
Total Proved plus Probable             1,759   1,366   1,100     913     776
Total Possible                           609     397     274     198     148
Total Proved plus Probable plus
 Possible                              2,368   1,763   1,374   1,111     924
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Pro Forma Combined Reserves and Net Present Value

On January 13, 2016, Gran Tierra completed its acquisition of all the issued and outstanding common shares of Petroamerica, and expects to complete its acquisition of all the issued and outstanding common shares of PGC on or about January 25, 2016. The following table summarizes pro forma combined NI 51-101 and COGEH compliant WI reserves at year-end 2015 after giving effect to the Petroamerica and PGC acquisitions and derived from the GTE McDaniel Reserves Report, the PTA McDaniel Reserves Report and the PGC McDaniel Reserves Report.


----------------------------------------------------------------------------
BOE                         Gran Tierra   Combined Petroamerica    Pro Forma
(COGEH compliant)           WI Reserves     and PGC WI Reserves     Combined
----------------------------------------------------------------------------
Reserves Category                  MBOE                    MBOE         MBOE
----------------------------------------------------------------------------
Total Proved                     48,350                   4,681       53,031
Total Probable                   17,612                   5,586       23,198
                       -----------------------------------------------------
Total Proved plus
 Probable                        65,962                  10,267       76,229
Total Possible                   15,047                   4,735       19,782
                       -----------------------------------------------------
Total Proved plus
 Probable plus Possible          81,009                  15,002       96,011
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Readers are cautioned that the aggregate estimates set forth above may reflect different price estimates and other assumptions.

The following table summarizes pro forma combined before tax net present values discounted at 10% at year-end 2015.


----------------------------------------------------------------------------
                            Gran Tierra  Combined Petroamerica     Pro Forma
                                                       and PGC      Combined
----------------------------------------------------------------------------
Reserves Category             $ million              $ million     $ million
----------------------------------------------------------------------------
Total Proved                        814                     48           862
Total Probable                      286                     83           369
                         ---------------------------------------------------
Total Proved plus                 1,100                    131         1,231
 Probable
Total Possible                      274                    103           377
                         ---------------------------------------------------
Total Proved plus                 1,374                    234         1,608
 Probable plus Possible
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Reserves Reported in Accordance with United States Reporting Requirements

The following tables summarize Gran Tierra's SEC compliant reserves in Colombia and Brazil as derived from the GTE McDaniel Reserves Report and the GTE GLJ 2014 Reserves Report calculated using average start-of-month 2015 and 2014 oil and gas prices.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                 2015 Year-End   2015 Year-End   2014 Year-End
----------------------------------------------------------------------------
                                                   Net After         Company
                                     Company         Royalty        Interest
Oil and Liquids                     Interest         ("NAR")        Reserves
(SEC Compliant)                     Reserves        Reserves         ((iii))
----------------------------------------------------------------------------
Reserves Category                  Mbbl((i))       Mbbl((i))       Mbbl((i))
----------------------------------------------------------------------------
Total Proved                          45,941          38,109          49,698
Total Probable                        18,506          15,276          17,263
                            ------------------------------------------------
Total Proved plus Probable            64,447          53,385          66,961
Total Possible                        14,767          12,155          20,103
                            ------------------------------------------------
Total Proved plus Probable
 plus Possible                        79,214          65,540          87,064
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                 2015 Year-End   2015 Year-End   2014 Year-End
----------------------------------------------------------------------------
                                                                     Company
                                     Company                        Interest
Gas                                 Interest             NAR        Reserves
(SEC Compliant)                     Reserves        Reserves         ((iii))
----------------------------------------------------------------------------
Reserves Category                 MMcf((ii))      MMcf((ii))      MMcf((ii))
----------------------------------------------------------------------------
Total Proved                           5,190           4,628           1,081
Total Probable                         2,931           2,616           3,822
                            ------------------------------------------------
Total Proved plus Probable             8,121           7,244           4,903
Total Possible                         2,653           2,374           3,152
                            ------------------------------------------------
Total Proved plus Probable
 plus Possible                        10,774           9,618           8,055
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                 2015 Year-End   2015 Year-End   2014 Year-End
----------------------------------------------------------------------------
                                                                     Company
                                     Company                        Interest
BOE                                 Interest             NAR        Reserves
(SEC Compliant)                     Reserves        Reserves         ((iii))
----------------------------------------------------------------------------
Reserves Category                       MBOE            MBOE            MBOE
----------------------------------------------------------------------------
Total Proved                          46,806          38,880          49,878
Total Probable                        18,994          15,712          17,900
                            ------------------------------------------------
Total Proved plus Probable            65,800          54,592          67,778
Total Possible                        15,209          12,551          20,628
                            ------------------------------------------------
Total Proved plus Probable
 plus Possible                        81,009          67,143          88,406
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Before Tax Net Present Values

The following table summarizes before tax net present values for Gran Tierra's SEC compliant reserves at year-end 2015 calculated using average start-of-month oil and gas prices.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Total Company                       Before Tax Net Present Value ($ million)
----------------------------------------------------------------------------
                                                  Discount Rate
                                    ----------------------------------------
                                    ----------------------------------------
                                          0%      5%     10%     15%     20%
------------------------------------========================================
Reserves Category
----------------------------------------------------------------------------
Total Proved                             844     719     626     556     501
Total Probable                           301     226     174     138     111
                                    ----------------------------------------
Total Proved plus Probable             1,145     945     800     694     612
Total Possible                           343     234     169     127      99
                                    ----------------------------------------
Total Proved plus Probable plus
 Possible                              1,488   1,179     969     821     711
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The SEC standardized measure of after tax future net cash flows discounted at 10% from Gran Tierra's estimated SEC compliant proved oil and gas reserves at December 31, 2015, is $464.8 million.

Pro Forma Combined Reserves and Net Present Value

On January 13, 2016, Gran Tierra completed its acquisition of all the issued and outstanding common shares of Petroamerica, and expects to complete its acquisition of all the issued and outstanding common shares of PGC on or about January 25, 2016. The following table summarizes pro forma combined SEC compliant company interest reserves at year-end 2015 as derived from the GTE McDaniel Reserves Report, the PTA McDaniel Reserves Report and the PGC McDaniel Reserves Report.


----------------------------------------------------------------------------
BOE                        Gran Tierra   Combined Petroamerica     Pro Forma
(SEC Compliant)       Company Interest         and PGC Company      Combined
                              Reserves       Interest Reserves
----------------------------------------------------------------------------
Reserves Category                 MBOE                    MBOE          MBOE
----------------------------------------------------------------------------
Total Proved                    46,806                   4,464        51,270
Total Probable                  18,994                   5,513        24,507
                   ---------------------------------------------------------
Total Proved plus
 Probable                       65,800                   9,977        75,777
Total Possible                  15,209                   4,471        19,680
                   ---------------------------------------------------------
Total Proved plus
 Probable plus
 Possible                       81,009                  14,448        95,457
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The following table summarizes pro forma combined before tax net present values discounted at 10% at year-end 2015.


----------------------------------------------------------------------------
                            Gran Tierra  Combined Petroamerica     Pro Forma
                                                       and PGC      Combined
----------------------------------------------------------------------------
Reserves Category             $ million              $ million     $ million
----------------------------------------------------------------------------
Total Proved                        626                     43           669
Total Probable                      174                     46           220
                        ----------------------------------------------------
Total Proved plus                   800                     89           889
 Probable
Total Possible                      169                     58           227
                        ----------------------------------------------------
Total Proved plus                   969                    147         1,116
 Probable plus Possible
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Prospective and Contingent Resources

In addition to the GTE McDaniel Prospective Resources Report, an updated independent assessment of Gran Tierra's contingent and prospective resources on its Peruvian exploration and development properties was completed by GLJ as of September 30, 2015, (the "GTE GLJ Contingent and Prospective Resources Report") in accordance COGEH and the standards established by NI 51-101.

Additionally, an independent assessment of prospective resources has been completed by McDaniel on Petroamerica, the acquisition of which has closed, as reflected in the PTA McDaniel Prospective Resources Report.

The following table summarizes the prospective resources for Colombia, proforma with the acquisitions, and for Peru derived from the GTE McDaniel Prospective Resources Report, the PTA McDaniel Prospective Resources Report and the GTE GLJ Contingent and Prospective Resources Report:


                             WI Prospective Resources - Unrisked      Risked
                                           (1)(2)                  Resources
                          ----------------------------------------
Colombia                  Prospects/    Low    P50   Mean     High   Mean(2)
Basin                        (Leads)
----------------------------------------------------------------------------
Gran Tierra
------------------------------------
Light and Medium Crude Oil
 (MMbbl)((iv))
--------------------------
Putumayo(3)(5)                    30  102.0  262.2  371.3    764.6      99.4
Llanos(3)(5)                       3    4.5   16.1   25.7     58.5       5.0
Sinu(3)(5)                 4 (leads)    8.4   43.4   83.1    210.7      11.7
                                    ----------------------------------------
Total (3)(4)(5)                       114.9  321.7  480.1  1,033.8     116.1

Conventional Natural Gas
 (MMcf) ((ii))
--------------------------
Putumayo(3)(5)                    30      -      -      -        -         -
Llanos(3)(5)                       3      -      -      -        -         -
Sinu(3)(5)                 4 (leads)   13.4   67.1  126.3    318.1      18.1
                                    ----------------------------------------
Total (3)(4)(5)                        13.4   67.1  126.3    318.1      18.1

BOE (MMBOE)
--------------------------
Putumayo(3)(5)                    30  102.0  262.2  371.3    764.6      99.4
Llanos(3)(5)                       3    4.5   16.1   25.7     58.5       5.0
Sinu(3)(5)                 4 (leads)   10.6   54.5  104.1    263.7      14.6
                                    ----------------------------------------
Total (3)(4)(5)                       117.1  332.8  501.1  1,086.8     119.0

Petroamerica and PGC
------------------------------------
Light and Medium Crude Oil
 (MMbbl) ((iv))
--------------------------
Putumayo(3)(5)                    15   12.9   44.4   70.1    156.8      35.4
                             9 and 2
Llanos(3)(5)                   leads   38.9   88.8  110.5    209.8      23.8
                                    ----------------------------------------
                            24 and 2
Total (3)(4)(5)                leads   51.8  133.2  180.6    366.6      59.2

Pro Forma Combined
------------------------------------
BOE (MMBOE)
--------------------------
Putumayo(3)(5)                    45  114.9  306.6  441.4    921.4     134.8
                             9 and 2
Llanos(3)(5)                   leads   43.4  104.9  136.2    268.3      28.8
Sinu(3)(5)                 4 (leads)   10.6   54.5  104.1    263.7      14.6
                                    ----------------------------------------
                            54 and 6
Total (3)(4)(5)                leads  168.9  466.0  681.7  1,453.4     178.2

((iv)) million barrels of oil

(1) There is no certainty that any portion of the resources will be discovered. If discovered, there is no certainty that it will be commercially viable to produce any portion of the resources. See "Disclosure of Oil and Gas Information" below for important cautionary notes regarding prospective resources.

(2) The risked resources are partially risked prospective resources that have been risked for chance of discovery, but have not been risked for the chance of development. The chance of development is defined as the probability of a project being commercially viable. Quantifying the chance of development requires consideration of both economic contingencies and other contingencies, such as legal, regulatory, market access, political, social license, internal and external approvals and commitment to project finance and development timing. As many of these factors are extremely difficult to quantify, the chance of development is uncertain and must be used with caution. The chance of development was estimated to be 75 percent in the Putumayo and Llanos Basins and 60 percent in the Sinu Basin.

(3) Total based on the probabilistic aggregation of zones within a prospect and arithmetic aggregation of the individual prospects to the Total level. The estimates of prospective resources for individual properties may not reflect the same confidence level as estimates of prospective resources for all properties, due to the effects of aggregation. Aggregation of multiple zones and multiple prospects may lead to slight numeric variation due to rounding errors.

(4) The unrisked total assumes every prospect is successful and as such is not representative of the exploration portfolio unrisked total as defined in COGE Handbook Volume 2 Section 2.8.2.

(5) Company gross resources are based on WI share of the property gross resources.

(6) Based on a Mcf to BOE conversion of 6 to 1.


                       WI Prospective Resources - Unrisked (1)(2)     Risked
                                                                   Resources
                      --------------------------------------------
Peru                  Prospects/     Low     P50     Mean     High   Mean(2)
Basin                    (Leads)
----------------------------------------------------------------------------
Light and Medium Crude
 Oil (MMbbl)((iv))
----------------------
Maranon(3)(5)                  5   159.9   774.8  1,604.8  3,274.7     317.1
Ucayali(3)(5)                  1    61.1   218.3    312.9    682.8      60.1
                                --------------------------------------------
Total (3)(4)(5)                    221.0   993.1  1,917.7  3,957.5     377.2

Conventional Natural
 Gas (MMcf) ((ii))
----------------------
Maranon(3)(5)                  5       -       -        -        -         -
Ucayali(3)(5)                  1       -       -        -        -         -
                                --------------------------------------------
Total (3)(4)(5)                        -       -        -        -         -

BOE (MMBOE)
----------------------
Maranon(3)(5)                  5   159.9   774.8  1,604.8  3,274.7     317.1
Ucayali(3)(5)                  1    61.1   218.3    312.9    682.8      60.1
                                --------------------------------------------
Total (3)(4)(5)                    221.0   993.1  1,917.7  3,957.5     377.2

(1) There is no certainty that any portion of the resources will be discovered. If discovered, there is no certainty that it will be commercially viable to produce any portion of the resources. See "Disclosure of Oil and Gas Information" below for important cautionary notes regarding prospective resources.

(2) The risked resources are partially risked prospective resources that have been risked for chance of discovery, but have not been risked for the chance of development. The chance of development is defined as the probability of a project being commercially viable. Quantifying the chance of development requires consideration of both economic contingencies and other contingencies, such as legal, regulatory, market access, political, social license, internal and external approvals and commitment to project finance and development timing. As many of these factors are extremely difficult to quantify, the chance of development is uncertain and must be used with caution. The chance of development was estimated to be 69 percent in the Maranon and Ucayali Basins.

(3) Total based on the probabilistic aggregation of zones within a prospect and arithmetic aggregation of the individual prospects to the Total level. The estimates of prospective resources for individual properties may not reflect the same confidence level as estimates of prospective resources for all properties, due to the effects of aggregation. Aggregation of multiple zones and multiple prospects may lead to slight numeric variation due to rounding errors.

(4) The unrisked total assumes every prospect is successful and as such is not representative of the exploration portfolio unrisked total as defined in COGE Handbook Volume 2 Section 2.8.2.

(5) Company gross resources are based on WI share of the property gross resources.

(6) Based on a Mcf to BOE conversion of 6 to 1.

The following tables summarize Gran Tierra's contingent resources as of September 30, 2015, as derived from the GTE Contingent and Prospective Resources Report:


                                 Summary of Contingent Resources (1)(2)(3)
                               ---------------------------------------------
Peru                                        1C             2C             3C
----------------------------------------------------------------------------
Heavy Oil (MMbbl) ((iv))
-------------------------------
Bretana                                   34.2           53.0           80.9
                               ---------------------------------------------
                                          34.2           53.0           80.9
                               ---------------------------------------------
                               ---------------------------------------------

(1) All of the Company's contingent resources have been classified as heavy oil. There is uncertainty that it will be commercially viable to produce any portion of the resources.

(2) "Contingent Resources" are 100% of the volumes estimated to be recoverable from the field in the event that it is developed.

(3) The volumes reported here are "unrisked" in the sense that no adjustment has been made for the risk that the field may not be developed in the form envisaged or may not be developed at all (i.e. no "Chance of Development" factor has been applied).

Forecast prices

The pricing assumptions used in estimating NI 51-101 and COGEH compliant reserves data disclosed above with respect to net present values of future net revenue are set forth below. The forecast inflation rate for price is 2% from 2030 onwards. The price forecast is based off McDaniel's standard price forecast effective January 1, 2016. McDaniel is an independent qualified reserves auditor pursuant to NI 51-101.


                                              Brent
                                            Crude Oil
                          Year               $US/bbl
                  ----------------------------------------
                  ----------------------------------------
                          2016               $47.50
                          2017               $56.20
                          2018               $65.00
                          2019               $71.70
                          2020               $75.80

About Gran Tierra Energy Inc.

Gran Tierra Energy Inc. 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 holds interests in producing and prospective properties in Colombia, Peru and Brazil. Gran Tierra 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's Securities and Exchange Commission filings are available on a website maintained by the Securities and Exchange Commission at www.sec.gov and on SEDAR at www.sedar.com.

For more information on Gran Tierra please go to: www.grantierra.com.

DISCLAIMER

This press release contains opinions, forecasts, projections, and other statements about future events or results that constitute forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and financial outlook and forward looking information within the meaning of applicable Canadian securities laws (collectively, "forward-looking statements"). Such forward-looking statements include, but are not limited to, the expected closing of the PGC acquisition and the expected benefits of such transaction.

The forward-looking statements contained in this press release reflect several material factors and expectations and assumptions of Gran Tierra including, without limitation, that Gran Tierra will continue to conduct its operations in a manner consistent with its current expectations, the accuracy of testing and production results and seismic data, pricing and cost estimates (including with respect to commodity pricing and exchange rates), rig availability, the effects of drilling down-dip, the effects of waterflood and multi-stage fracture stimulation operations, the extent and effect of delivery disruptions, and the general continuance of current or, where applicable, assumed operational, regulatory and industry conditions including in areas of potential expansion, and the ability of Gran Tierra to execute its current business and operational plans in the manner currently planned. Gran Tierra believes the material factors, expectations and assumptions reflected in the forward-looking statements are reasonable at this time but no assurance can be given that these factors, expectations and assumptions will prove to be correct.

Among the important factors that could cause actual results to differ materially from those indicated by the forward-looking statements in this press release are: risk relating to Gran Tierra's ability to complete the acquisition of PGC and to realize the anticipated benefits from the acquisitions of Petroamerica and PGC; Gran Tierra's operations are located in South America, and unexpected problems can arise due to guerilla activity; technical difficulties and operational difficulties may arise which impact the production, transport or sale of our products; geographic, political and weather conditions can impact the production, transport or sale of our products; the risk that current global economic and credit conditions may impact oil prices and oil consumption more than Gran Tierra currently predicts; the ability of Gran Tierra to execute its business plan; the risk that unexpected delays and difficulties in developing currently owned properties may occur; the timely receipt of regulatory or other required approvals for our operating activities; the failure of exploratory drilling to result in commercial wells; unexpected delays due to the limited availability of drilling equipment and personnel; the risk that oil prices could continue to fall, or current global economic and credit market conditions may impact oil prices and oil consumption more than Gran Tierra currently predicts, which could cause Gran Tierra to further modify its strategy and capital spending program; and the risk factors detailed from time to time in Gran Tierra's periodic reports filed with the Securities and Exchange Commission, including, without limitation, under the caption " Risk Factors" in Gran Tierra's Annual Report on Form 10-K filed March 2, 2015, and its Quarterly Report on Form 10-Q filed November 3, 2015. These filings are available on the Web site maintained by the Securities and Exchange Commission at http://www.sec.gov and on SEDAR at www.sedar.com. Although the current capital spending program and long term strategy of Gran Tierra is based upon the current expectations of the management of Gran Tierra, should any one of a number of issues arise, Gran Tierra may find it necessary to alter its business strategy and/or capital spending program and there can be no assurance as at the date of this press release as to how those funds may be reallocated or strategy changed.

All forward-looking statements are made as of the date of this press release and the fact that this press release remains available does not constitute a representation by Gran Tierra that Gran Tierra believes these forward-looking statements continue to be true as of any subsequent date. Actual results may vary materially from the expected results expressed in forward-looking statements. Gran Tierra disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as expressly required by applicable securities laws. Gran Tierra's forward-looking statements are expressly qualified in their entirety by this cautionary statement.

DISCLOSURE OF OIL AND GAS INFORMATION

Proved reserves are those reserves that can be estimated with a high degree of certainty to be recoverable. It is likely that the actual remaining quantities recovered will exceed the estimated proved reserves.

Probable reserves are those additional reserves that are less certain to be recovered than proved reserves. It is equally likely that the actual remaining quantities recovered will be greater or less than the sum of the estimated proved plus probable reserves.

Possible reserves are those additional reserves that are less certain to be recovered than Probable reserves. There is a 10% probability that the quantities actually recovered will equal or exceed the sum of Proved plus Probable plus Possible reserves. The estimate of reserves for individual properties may not reflect the same confidence level as estimates of reserves for all properties, due to the effects of aggregation.

Estimates of net present value contained herein do not necessarily represent fair market value of reserves. Estimates of reserves and future net revenue for individual properties may not reflect the same level of confidence as estimates of reserves and future net revenue for all properties, due to the effect of aggregation.

BOEs have been converted on the basis of six thousand cubic feet ("Mcf") natural gas to 1 barrel of oil. BOEs may be misleading, particularly if used in isolation. A BOE conversion ratio of 6 Mcf: 1 bbl is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead. In addition, given that the value ratio based on the current price of oil as compared with natural gas is significantly different from the energy equivalent of six to one, utilizing a BOE conversion ratio of 6 Mcf: 1 bbl would be misleading as an indication of value.

Contingent resources are the quantities of petroleum estimated, as of a given date, to be potentially recoverable from known accumulations using established technology or technology underdevelopment, but which are not currently considered to be commercially recoverable due to one or more contingencies. Contingencies are conditions that must be satisfied for a portion of contingent resources to be classified as reserves that are: (a) specific to the project being evaluated; and (b) expected to be resolved within a reasonable timeframe. Contingencies may include factors such as economic, legal, environmental, political and regulatory matters or a lack of markets. It is also appropriate to classify as contingent resources the estimated discovered recoverable quantities associated with a project in the early evaluation stage.

Estimates related to contingent resources:


                         General timeline
                           including the
         Estimated cost   estimated date      Estimated
           to achieve        of first          recovery
           commercial       commercial        technology    Basis of project
           production       production     (conventional or  (conceptual or
           ($ million)        (Years)      unconventional)  pre-development)
        --------------------------------------------------------------------
                                                             Pre-development
Bretana      440-525           3-10          Conventional         study

Prospective Resources are those quantities of petroleum estimated, as of a given date, to be potentially recoverable from undiscovered accumulations by application of future development projects. Prospective resources have both an associated chance of discovery and a chance of development. Not all exploration projects will result in discoveries. The chance that an exploration project will result in the discovery of petroleum is referred to as the "chance of discovery." Thus, for an undiscovered accumulation the chance of commerciality is the product of two risk components-the chance of discovery and the chance of development. There is no certainty that any portion of the prospective resources will be discovered. If discovered, there is no certainty that it will be commercially viable to produce any portion of the prospective resources.

Estimates of the Company's contingent resources and prospective resources are based upon the GTE McDaniel Prospective Resources Report, the GTE GLJ Contingent and Prospective Resources Report and the PTA 2015 Prospective Resources Report.

The estimates of contingent and prospective resources provided in this press release are estimates only and there is no guarantee that the estimated contingent and prospective resources will be recovered. Actual contingent and prospective resources may be greater than or less than the estimates provided in this in this press release and the differences may be material. There is no assurance that the forecast price and cost assumptions applied by McDaniel and GLJ in evaluating Gran Tierra's, Petroamerica's and PGC's contingent and prospective resources will be attained and variances could be material. There is no certainty that any portion of the prospective resources will be discovered. If discovered, there is no certainty that it will be commercially viable to produce any portion of the prospective resources. There is also uncertainty that it will be commercially viable to produce any part of the contingent resources.

Estimates of contingent and prospective resources are by their nature more speculative than estimates of proved reserves and would require substantial capital spending over a significant number of years to implement recovery. Actual locations drilled and quantities that may be ultimately recovered from our properties will differ substantially. In addition, we have made no commitment to drill, and likely will not drill, all of the drilling locations that have been attributable to these quantities.

Except as otherwise set forth herein, the prospective resources estimates that are referred to herein are un-risked as to both chance of discovery and chance of development and the contingent resources estimates that are referred to herein are un-risked as to chance of development (i.e. the level of risk associated with the chance of discovery and chance of development was not assessed by GLJ as part of the evaluations that were conducted). Risks that could impact the chance of discovery and chance of development include, without limitation: geological uncertainty and uncertainty regarding individual well drainage areas; uncertainty regarding the consistency of productivity that may be achieved from lands with attributed resources; potential delays in development due to product prices, access to capital, availability of markets and/or take-away capacity; and uncertainty regarding potential flow rates from wells and the economics of those wells.

The following classification of contingent and prospective resources is used in the presentation:


--  Low Estimate (or 1C) means there is at least a 90 percent probability
    (P90) that the quantities actually recovered will equal or exceed the
    low estimate.
--  Best Estimate (or 2C) means there is at least a 50 percent probability
    (P50) that the quantities actually recovered will equal or exceed the
    best estimate.
--  High Estimate (or 3C) means there is at least a 10 percent probability
    (P10) that the quantities actually recovered will equal or exceed the
    high estimate.

In general, the significant factors that may change the prospective resources and contingent resources estimates include further delineation drilling, which could change the estimates either positively or negatively, future technology improvements, which would positively affect the estimates, and additional processing capacity that could affect the volumes recoverable or type of production. Additional facility design work, development plans, reservoir studies and delineation drilling is expected to be completed by the Company in accordance with its long-term resource development plan.

Disclosure of Reserve Information and Cautionary Note to U.S. Investors

Unless expressly stated otherwise, all estimates of proved, probable and possible reserves and related future net revenue disclosed in this press release have been prepared in accordance with NI 51-101. Estimates of reserves and future net revenue made in accordance with NI 51-101 will differ from corresponding estimates prepared in accordance with applicable U.S. Securities and Exchange Commission ("SEC") rules and disclosure requirements of the U.S. Financial Accounting Standards Board ("FASB"), and those differences may be material. NI 51-101, for example, requires disclosure of reserves and related future net revenue estimates based on forecast prices and costs, whereas SEC and FASB standards require that reserves and related future net revenue be estimated using average prices for the previous 12 months. In addition, NI 51-101 permits the presentation of reserves estimates on a "company gross" basis, representing Gran Tierra's working interest share before deduction of royalties, whereas SEC and FASB standards require the presentation of net reserve estimates after the deduction of royalties and similar payments. There are also differences in the technical reserves estimation standards applicable under NI 51-101 and, pursuant thereto, the COGEH, and those applicable under SEC and FASB requirements.

In addition to being a reporting issuer in certain Canadian jurisdictions, Gran Tierra is a registrant with the SEC and subject to domestic issuer reporting requirements under U.S. federal securities law, including with respect to the disclosure of reserves and other oil and gas information in accordance with U.S. federal securities law and applicable SEC rules and regulations (collectively, "SEC requirements"). Disclosure of such information in accordance with SEC requirements is included in the Company's Annual Report on Form 10-K and in other reports and materials filed with or furnished to the SEC and, as applicable, Canadian securities regulatory authorities. The SEC permits oil and gas companies that are subject to domestic issuer reporting requirements under U.S. federal securities law, in their filings with the SEC, to disclose only estimated proved, probable and possible reserves that meet the SEC's definitions of such terms. Gran Tierra has disclosed estimated proved, probable and possible reserves in its filings with the SEC. In addition, Gran Tierra prepares its financial statements in accordance with United States generally accepted accounting principles, which require that the notes to its annual financial statements include supplementary disclosure in respect of the Company's oil and gas activities, including estimates of its proved oil and gas reserves and a standardized measure of discounted future net cash flows relating to proved oil and gas reserve quantities. This supplementary financial statement disclosure is presented in accordance with FASB requirements, which align with corresponding SEC requirements concerning reserves estimation and reporting.

In this press release, the Company uses the terms contingent resources and prospective resources. The SEC guidelines strictly prohibit the Company from including contingent or prospective resources in filings with the SEC. Investors are urged to consider closely the disclosures and risk factors in the Company's Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and in the other reports and filings with the SEC, available from the Company's offices or website. These forms can also be obtained from the SEC via the internet at www.sec.gov or by calling 1-800-SEC-0330.

Contacts:
For investor and media inquiries please contact:
Gran Tierra Energy Inc.
Gary Guidry
Chief Executive Officer
+1.403.767.6500

Gran Tierra Energy Inc.
Ryan Ellson
Chief Financial Officer
+1.403.767.6501

Gran Tierra Energy Inc.
Chris Metcalfe
Director of Investor Relations
+1.403.698.7946
www.grantierra.com

Source: Gran Tierra Energy Inc.



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