Gran Tierra Energy Increases 2013 Production Guidance, Expands Moqueta Field Appraisal Drilling Program in Colombia

Gran Tierra Energy Increases 2013 Production Guidance, Expands Moqueta Field 
Appraisal Drilling Program in Colombia 
Three appraisal wells added to 2013 Moqueta drilling program after Moqueta-11 
tests almost 1,600 BOPD 
CALGARY, Oct. 16, 2013 /CNW/ - Gran Tierra Energy Inc. ("Gran Tierra Energy") 
(NYSE MKT: GTE, TSX: GTE), a company focused on oil exploration and production 
in South America, today provided a production and operations update for its 
2013 work program. 
"Gran Tierra Energy continues its operational momentum with strong corporate 
wide production in the third quarter, the successful testing of Moqueta-11 and 
the addition of three appraisal wells to this year's program to further define 
new reserve potential in the Moqueta field in the Putumayo Basin, Colombia," 
said Dana Coffield, President and Chief Executive Officer of Gran Tierra 
Energy. "The Moqueta-11 well tested two zones separately at a combined rate of 
almost 1,600 barrels of oil per day which should contribute to the growing 
production profile at the Moqueta field expected in 2014. Continued strong 
production and transportation performance throughout our portfolio has now led 
to another increase to Gran Tierra Energy's full-year production 
expectations," concluded Coffield. 
Production Highlights: 
Production for the third quarter of 2013 averaged approximately 22,500 barrels 
of oil equivalent per day ("BOEPD") net after royalties ("NAR") before 
adjustment for inventory changes or 22,000 BOEPD NAR adjusted for inventory 
changes (97% oil). Production for the third quarter of 2013 consisted of 
18,900 barrels of oil per day ("BOPD") NAR in Colombia, 2,800 BOEPD NAR in 
Argentina (82% oil) and 800 BOPD NAR in Brazil, all before inventory changes. 
Production for the third quarter of 2013 was above expectations due to the 
continued strong reservoir performance from the Costayaco field and successful 
execution of transportation strategies. As a result, Gran Tierra Energy 
anticipates 2013 average production to range between 21,500 and 22,500 BOEPD 
NAR before adjustment for inventory changes, an increase from the company's 
prior projections of 21,000 to 22,000 BOEPD NAR before adjustment for 
inventory changes. Approximately 96% of this production is expected to consist 
of light oil, with the balance consisting of natural gas. 
Chaza Block, Putumayo Basin (100% working interest and operator) 
The Moqueta-11 appraisal well was drilled to the southern flank of the Moqueta 
structure and encountered oil in the T-Sandstone and Caballos formations. 
The T-Sandstone formation consisted of 81 feet true vertical depth ("TVD") 
gross reservoir or 65 feet TVD of net reservoir thickness. It was perforated 
and tested from 6,812 feet to 6,912 feet measured depth ("MD") for 46 hours at 
an average rate of 802 BOPD of 27.2° API oil with a 0.3% water cut. The 
underlying Caballos formation consisted of 237 feet TVD gross reservoir or 144 
feet TVD net reservoir thickness. It was perforated and tested from 7,043 feet 
to 7,333 feet MD for 65 hours at an average rate of 756 BOPD of 27.4° API oil 
with a 0.3% water cut. The well was tested with a hydraulic jet pump. The 
top of the Villeta T-Sandstone is approximately 290 feet lower in the 
Moqueta-11 well compared to the lowest known oil encountered in the field at 
Moqueta-7 well, suggesting the oil column is 290 feet thicker than previously 
defined. The gross oil column in the Villeta T-Sandstone has now grown to 765 
feet and the gross oil column in the underlying Caballos reservoir has now 
grown to 960 feet. 
Results to date indicate additional oil potentially exists further down the 
flank of the Moqueta structure. As a result, three new appraisal wells have 
been added to the 2013 Moqueta work program. The Moqueta-12 appraisal well 
began drilling on September 23, 2013, and is targeting a reservoir that is 
further south in a previously untested block approximately 270 feet down dip 
of the lowest known oil encountered at Moqueta-11. 
Gran Tierra Energy intends to drill two additional wells adjacent to the 
Moqueta field before year-end. The Corunta-1 well is expected to spud in 
November and be drilled in a northeast direction from the Costayaco-17 well 
pad targeting what is believed to be a downthrown fault block extension west 
of the Moqueta field. The Zapotero-1 well is expected to spud in December 
and target the southeastern portion of the Moqueta structure. 
Guayuyaco Block, Putumayo Basin (70% Working Interest and operator, Ecopetrol 
30% Working Interest) 
The Miraflor West-1 exploration well on the Guayuyaco Block, targeting the 
same Cretaceous sandstone reservoirs encountered at the Costayaco and Moqueta 
oil fields, is expected to spud in November 2013. 
Llanos-22 Block, Llanos Basin (Gran Tierra Energy 45% Working Interest, CEPSA 
55% Working Interest and operator) 
The Mayalito-1 exploration well is drilling ahead and is expected to reach 
total depth ("TD") in October. This well will explore a shallow prospect and 
test additional deeper hydrocarbon bearing zones encountered but not tested by 
the successful Ramiriqui-1 oil discovery well. 
Recôncavo Basin 
Gran Tierra Energy is preparing to re-enter and isolate the final two fracture 
stages at the 1-GTE-6HP-BA well, on Block REC-T-129, prior to re-testing the 
Gomo shale interval. The micro-seismic data acquired during the fracture 
stimulation at 1-GTE-6HP-BA suggested that the final two fracture stages had 
greater fracture heights than expected and inadvertently fracked into a lower 
saline water bearing zone. 
1-GTE-7HPC-BA is a sidetrack from the 1-GTE-7HP-BA wellbore on Block REC-T-155 
and is also targeting the Gomo shale oil interval. The intent was to drill a 
1,640 foot horizontal section; however, due to wellbore stability issues the 
well reached TD with a 440 feet horizontal section. The wellbore is currently 
suspended awaiting fracture stimulation which is planned for early December. 
The 1-GTE-8-BA exploration well is a deviated well targeting the Gomo shale 
oil interval on Block REC-T-155. Gran Tierra Energy met its primary objective 
which was to cut and retrieve core from the target interval; 144 feet of core 
was successfully retrieved for detailed special core analysis studies to gain 
critical information regarding the oil shale play. The wellbore is currently 
suspended awaiting fracture stimulation which is planned for mid-November. 
Gran Tierra Energy received a payment of approximately $54 million (before 
income taxes) in connection with termination of a farm-in agreement in the 
Recôncavo Basin relating to blocks REC-T-129, -142, -155 and -224. The 
payment will be recorded in Gran Tierra Energy's third quarter 2013 results as 
a credit to its capital pool and an associated income tax expense. Gran 
Tierra Energy retains 100% working interest in these blocks. 
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 and on SEDAR at 
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 
This news release contains certain forward-looking information and 
forward-looking statements (collectively, "forward-lookingstatements") under 
the meaning of applicable securities laws, including Canadian Securities 
Administrators' National Instrument 51-102 - Continuous Disclosure Obligations 
and the United States Private Securities Litigation Reform Act of 1995. The 
use of the words "should", "anticipate", "will", "intends", "planned", 
"expected" and "potentially" and derivations thereof and similar terms 
identify forward-looking statements. In particular, but without limiting the 
foregoing, this news release contains forward-looking statements regarding 
Gran Tierra Energy's 2013 average production rates and the product mix of such 
production, its anticipated production, exploration and development 
activities, expected benefits from testing, and expected timing of activities 
and results. 
The forward-looking statements contained in this news release reflect several 
material factors and expectations and assumptions of Gran Tierra Energy 
including, without limitation: assumptions relating to log evaluations; that 
Gran Tierra Energy will continue to conduct its operations in a manner 
consistent with past operations; the accuracy of testing and production 
results and seismic data; the effects of certain drilling techniques; cost and 
price estimates; and the general continuance of current or, where applicable, 
assumed operational, regulatory and industry conditions. Gran Tierra Energy 
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 
The forward-looking statements contained in this news release are subject to 
risks, uncertainties and other factors that could cause actual results or 
outcomes to differ materially from those contemplated by the forward-looking 
statements, including, among others: test results provide only an indication 
of resource amounts and are not conclusive as to actual resource amounts, 
which may be substantially different than indicated by the test results; 
unexpected technical difficulties and operational difficulties may occur, 
which could impact or delay the completion or continuation of drilling; 
geographic, political and weather conditions can interrupt drilling, which 
could impact or delay the commencement or continuation of drilling; and the 
risk that current global economic and credit market conditions may impact oil 
prices and oil consumption more than Gran Tierra Energy currently predicts, 
which could cause Gran Tierra Energy to change its current drilling, 
production and testing plans; and production data should be considered 
preliminary until a full well test interpretation has been done. Further 
information on potential factors that could affect Gran Tierra Energy are 
included in risks detailed from time to time in Gran Tierra Energy's 
Securities and Exchange Commission filings, including, without limitation, 
under the caption "Risk Factors" in Gran Tierra Energy's Quarterly Report on 
Form 10-Q filed August 6, 2013. These filings are available on a Web site 
maintained by the Securities and Exchange Commission at and 
on SEDAR at forward-looking statements contained herein 
are expressly qualified in their entirety by this cautionary statement. The 
forward-looking statements included in this press release are made as of the 
date of this press release and Gran Tierra Energy 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 legislation. 
A barrel of oil equivalent ("BOE") is calculated using the conversion factor 
of six thousand cubic feet ("Mcf") of natural gas being equivalent to one 
barrel of oil. BOEs may be misleading, particularly if used in isolation. A 
BOE conversion ratio of 6 Mcf : 1 barrel of oil 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 to natural gas is 
significantly different from the energy equivalent of six to one, utilizing a 
BOE conversion ratio of 6 Mcf: 1 barrel of oil would be misleading as an 
indication of value.

SOURCE  Gran Tierra Energy Inc. 
For investor and media inquiries please contact: Jason Crumley Director, 
Investor Relations 403-265-3221 
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CO: Gran Tierra Energy Inc.
ST: Alberta
-0- Oct/16/2013 12:00 GMT
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