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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UNITED STATES</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman">FORM 8-K</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT REPORT</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of Report (Date of earliest event reported): <font style="DISPLAY: inline; FONT-WEIGHT: bold">December 6, 2011</font></font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman">Gran Tierra Energy Inc.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(State or other jurisdiction</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">300, 625 - 11th Avenue S.W.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Calgary, Alberta, Canada T2R 0E1</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item 1.02.&#160;&#160;Termination of a Material Definitive Agreement.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Gran Tierra Energy Inc. (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-STYLE: italic">Gran Tierra</font>&#8221;), through its wholly owned subsidiaries Gran Tierra Energy Colombia Ltd. (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-STYLE: italic">Gran Tierra Colombia</font>&#8221;) and Solana Petroleum Exploration Colombia Ltd. (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-STYLE: italic">Solana Colombia</font>&#8221;), has been in negotiations with Ecopetrol with respect to entering into separate crude oil sales and crude oil transportation agreements to replace (1) the agreement, dated July 27, 2011, between Gran Tierra Colombia and Ecopetrol (the &#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-STYLE: italic">Gran Tierra Colombia Agreement</font>&#8221;), pursuant to which Gran Tierra Colombia agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Gran Tierra Colombia, all of the volume of crude oil production produced in the Chaza Block, Santana Block and Guayuyaco Block owned by Gran Tierra Colombia, and (2) the agreement, dated July 27, 2011, between Solona Colombia and Ecopetrol (the &#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-STYLE: italic">Solana Colombia Agreement</font>&#8221;), pursuant to which Solona Colombia agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Solona Colombia, all of the volume of crude oil production produced in the Chaza Block, Santana Block and Guayuyaco Block owned by Solona Colombia.&#160;&#160;The volume of crude oil under each of these agreements does not include the volume of oil owned by the National Hydrocarbons Agency (ANH) corresponding to royalties.&#160;&#160;Both the Gran Tierra Colombia Agreement and Solona Colombia Agreement have expiration dates of June 30, 2012.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Under the Gran Tierra Colombia Agreement and the Solana Colombia Agreement, Ecopetrol purchases crude oil at&#160;delivery points&#160;in the Putamayo basin.&#160;&#160;Under the proposed crude oil sales agreements Ecopetrol would purchase crude oil from Gran Tierra Colombia and Solana Colombia at the Tumaco Terminal, which is located on the Pacific coast of Colombia.&#160;&#160;Under the proposed crude oil transportation agreements, the crude oil would be transported by Ecopetrol from the <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Putamayo basin </font>to the Tumaco Terminal.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In connection with the proposed replacement of the Gran Tierra Colombia Agreement and Solona Colombia Agreement, Ecopetrol has delivered to Gran Tierra drafts of new crude oil sales and crude oil transportation agreements and, on December 6, 2011, delivered to Gran Tierra Colombia a notice of termination of the Gran Tierra Colombia Agreement, and delivered to Solana Colombia a notice of termination of the Solana Colombia Agreement, each with a proposed completion date of January 2, 2012.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></div>

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Unassociated Document
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
______________
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported):
December 6, 2011
______________
Gran Tierra Energy Inc.
(Exact name of Registrant as specified in its charter)
______________
Nevada
001-34018
98-0479924
(State or other jurisdiction
(Commission
(IRS Employer
of incorporation)
File Number)
Identification No.)
300, 625 - 11th Avenue S.W.
Calgary, Alberta, Canada T2R 0E1
(Address of principal executive offices)
(403) 265-3221
(Registrant's telephone number, including area code)
______________
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 1.02.  Termination of a Material Definitive Agreement.
Gran Tierra Energy Inc. ("
Gran Tierra
"), through its wholly owned subsidiaries Gran Tierra Energy Colombia Ltd. ("
Gran Tierra Colombia
") and Solana Petroleum Exploration Colombia Ltd. ("
Solana Colombia
"), has been in negotiations with Ecopetrol with respect to entering into separate crude oil sales and crude oil transportation agreements to replace (1) the agreement, dated July 27, 2011, between Gran Tierra Colombia and Ecopetrol (the "
Gran Tierra Colombia Agreement
"), pursuant to which Gran Tierra Colombia agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Gran Tierra Colombia, all of the volume of crude oil production produced in the Chaza Block, Santana Block and Guayuyaco Block owned by Gran Tierra Colombia, and (2) the agreement, dated July 27, 2011, between Solona Colombia and Ecopetrol (the "
Solana Colombia Agreement
"), pursuant to which Solona Colombia agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Solona Colombia, all of the volume of crude oil production produced in the Chaza Block, Santana Block and Guayuyaco Block owned by Solona Colombia.  The volume of crude oil under each of these agreements does not include the volume of oil owned by the National Hydrocarbons Agency (ANH) corresponding to royalties.  Both the Gran Tierra Colombia Agreement and Solona Colombia Agreement have expiration dates of June 30, 2012.
Under the Gran Tierra Colombia Agreement and the Solana Colombia Agreement, Ecopetrol purchases crude oil at delivery points in the Putamayo basin.  Under the proposed crude oil sales agreements Ecopetrol would purchase crude oil from Gran Tierra Colombia and Solana Colombia at the Tumaco Terminal, which is located on the Pacific coast of Colombia.  Under the proposed crude oil transportation agreements, the crude oil would be transported by Ecopetrol from the
Putamayo basin
to the Tumaco Terminal.
In connection with the proposed replacement of the Gran Tierra Colombia Agreement and Solona Colombia Agreement, Ecopetrol has delivered to Gran Tierra drafts of new crude oil sales and crude oil transportation agreements and, on December 6, 2011, delivered to Gran Tierra Colombia a notice of termination of the Gran Tierra Colombia Agreement, and delivered to Solana Colombia a notice of termination of the Solana Colombia Agreement, each with a proposed completion date of January 2, 2012.
S
IGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Gran Tierra Energy Inc.
By:
/s/ David Hardy
Name:
David Hardy
Title:
General  Counsel, Vice President, Legal and Secretary
Dated: December 12, 2011