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<P STYLE="border-top: Black 4.5pt double; font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center"><B>WASHINGTON, DC 20549</B></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center">______________</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>FORM 8-K</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CURRENT REPORT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>PURSUANT TO SECTION 13 OR 15(d) OF</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>THE SECURITIES EXCHANGE ACT OF 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Date of Report (Date of earliest event reported):
<B>February 7, 2012</B></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center">______________</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 12pt 0 0; text-align: center"><B>Gran Tierra Energy Inc.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center">(Exact name of Registrant as specified
in its charter)</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center">______________</P>

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-family: Times New Roman, Times, Serif">
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    <TD STYLE="width: 34%; padding-right: 0.1in; padding-left: 0.1in">
        <P STYLE="border-bottom: Black 0.5pt solid; font: 10pt Times New Roman, Times, Serif; margin: 6pt 0 0; text-align: center">Nevada</P></TD>
    <TD STYLE="width: 33%; padding-right: 0.1in; padding-left: 0.1in">
        <P STYLE="border-bottom: Black 0.5pt solid; font: 10pt Times New Roman, Times, Serif; margin: 6pt 0 0; text-align: center">001-34018</P></TD>
    <TD STYLE="width: 33%; padding-right: 0.1in; padding-left: 0.1in">
        <P STYLE="border-bottom: Black 0.5pt solid; font: 10pt Times New Roman, Times, Serif; margin: 6pt 0 0; text-align: center">98-0479924</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.1in; padding-left: 10.1pt; font-size: 10pt; text-align: center">(State or other jurisdiction</TD>
    <TD STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">(Commission</TD>
    <TD STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">(IRS Employer</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.1in; padding-left: 20.2pt; font-size: 10pt; text-align: center">of incorporation)</TD>
    <TD STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">File Number)</TD>
    <TD STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">Identification No.)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 0.1in; padding-left: 0.1in; font-size: 10pt; text-align: center">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-weight: normal">300, 625 -
11th Avenue S.W. </FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-weight: normal">Calgary, Alberta,
Canada T2R 0E1</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(Address of principal executive offices)
</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; text-indent: 0.5in"><B>(403) 265-3221 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Registrant&rsquo;s telephone number, including
area code)</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: center">______________</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 6pt 0">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):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 7.1pt">  <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings 2">&#163;</FONT></FONT>
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6.95pt"><FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings 2">&#163;</FONT></FONT>
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6.95pt"><FONT STYLE="font-family: Wingdings 2">&#163;</FONT>
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 2.05pt">  <FONT STYLE="font-family: Wingdings 2">&#163;</FONT>
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Item 1.01. Entry into a Material Definitive
Agreement.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">As previously disclosed,
on July 27, 2011, Gran Tierra Energy Colombia Ltd. (&ldquo;<B><I>Gran Tierra Colombia</I></B>&rdquo;) and Solana Petroleum Exploration
Colombia Ltd. (&ldquo;<B><I>Solana Colombia</I></B>&rdquo;), both wholly owned indirect subsidiaries of Gran Tierra Energy Inc.
(&ldquo;<B><I>Gran Tierra</I></B>&rdquo;), entered into agreements (respectively, the &ldquo;<B><I>Gran Tierra Agreement</I></B>&rdquo;
and the &ldquo;<B><I>Solana Agreement</I></B>&rdquo;) with Ecopetrol pursuant to which Gran Tierra Colombia and Solana Colombia
agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Gran Tierra Colombia and Solana 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 Solana
Colombia (the &ldquo;<B><I>Putamayo Production</I></B>&rdquo;).&nbsp;&nbsp;The volume of crude oil does not include the volume
of oil owned by the National Hydrocarbons Agency (ANH) corresponding to royalties.&nbsp;&nbsp;In the event that Ecopetrol does
not accept a full delivery, Gran Tierra Colombia and Solana Colombia may sell to another party the crude oil not accepted.&nbsp;&nbsp;
The Gran Tierra Colombia Agreement and Solona Colombia Agreement had expiration dates of June 30, 2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">Also as previously
disclosed, on December 6, 2011, Ecopetrol 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. On December 22, 2011, Ecopetrol delivered to Gran Tierra a new notice of termination of the Gran Tierra
Colombia Agreement, and delivered to Solana Colombia a new notice of termination of the Solana Colombia Agreement, extending the
proposed completion date of each agreement to January 31, 2012.</P>

<P STYLE="font: 10pt/115% Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">On February 7, 2012, Gran
Tierra Colombia and Solana Colombia each entered into an amendment, dated as of January 30, 2012, to the Gran Tierra Agreement
and the Solana Agreement, respectively, pursuant to which: (1) for Putamayo Production that is to be exported through the Port
of Tumaco on the Pacific coast of Colombia, the sales point is designated as the Tumaco Port rather than a point in the Putamayo
basin and the price received is determined based on a &ldquo;marker&rdquo; price (based on the average export price of Ecopetrol
of the South Blend mix by the Port of Tumaco for the month of the crude delivery) less a port operation fee and a commercialization
fee; (2) for Putamayo Production sold for export through Ecuador, the price received is determined based on a &ldquo;marker&rdquo;
price (based on the weighted average price of exports by Ecopetrol of Crude Oriente through the port of Balao) less a transportation
fee, transportation tax and commercialization fee; and (3) for Putamayo Production sold at the DINA station in the Putamayo Basin
for export by the Port of Cove&ntilde;as or for refining, the price received is determined based on a &ldquo;marker&rdquo; (based
on the average price of export of Grupo Empresarial crude mix Vasconia by the Port of Cove&ntilde;as during the month of delivery)
with adjustments for quality and less transportation fees, transportation tax, a commercialization fee and port operation fee.
Pursuant to the amendments, the expiry dates of both the Gran Tierra Agreement and the Solana Agreement have been extended to
July 31, 2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">Due to the change in the
sales point for Putamayo Production to be exported through the Port of Tumaco, Gran Tierra Colombia and Solana Colombia are currently
negotiating crude oil transportation agreements with Ecopetrol pursuant to which they would pay to Ecopetrol a transportation tariff
for the transportation by Ecopetrol of their Putamayo Production from the Putamayo Basin to the Port of Tumaco.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.5in"><B>&nbsp;</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">S<B>IGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.1pt; text-indent: 35.9pt">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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0; margin-top: 0pt; margin-bottom: 6pt">&nbsp;</P>

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<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">Gran Tierra Energy Inc.</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">By:&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 46%">/s/ David Hardy &nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; border-top: #000000 1px solid"> Name: David Hardy<BR>Title: General&nbsp; Counsel, Vice President, Legal and Secretary</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; text-indent: 0pt; margin-top: 0pt; margin-bottom: 6pt">&nbsp;<BR
STYLE="mso-special-character:
line-break"></P>

<P STYLE="margin: 0; font-size: 10pt"></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;Dated:&nbsp;February 10, 2012</P>

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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):
February 7, 2012
______________
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):
£
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
£
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
£
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
£
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 1.01. Entry into a Material Definitive
Agreement.
As previously disclosed,
on July 27, 2011, Gran Tierra Energy Colombia Ltd. ("
Gran Tierra Colombia
") and Solana Petroleum Exploration
Colombia Ltd. ("
Solana Colombia
"), both wholly owned indirect subsidiaries of Gran Tierra Energy Inc.
("
Gran Tierra
"), entered into agreements (respectively, the "
Gran Tierra Agreement
"
and the "
Solana Agreement
") with Ecopetrol pursuant to which Gran Tierra Colombia and Solana Colombia
agreed to sell to Ecopetrol, and Ecopetrol agreed to purchase from Gran Tierra Colombia and Solana 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 Solana
Colombia (the "
Putamayo Production
").  The volume of crude oil does not include the volume
of oil owned by the National Hydrocarbons Agency (ANH) corresponding to royalties.  In the event that Ecopetrol does
not accept a full delivery, Gran Tierra Colombia and Solana Colombia may sell to another party the crude oil not accepted.  
The Gran Tierra Colombia Agreement and Solona Colombia Agreement had expiration dates of June 30, 2012.
Also as previously
disclosed, on December 6, 2011, Ecopetrol 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. On December 22, 2011, Ecopetrol delivered to Gran Tierra a new notice of termination of the Gran Tierra
Colombia Agreement, and delivered to Solana Colombia a new notice of termination of the Solana Colombia Agreement, extending the
proposed completion date of each agreement to January 31, 2012.
On February 7, 2012, Gran
Tierra Colombia and Solana Colombia each entered into an amendment, dated as of January 30, 2012, to the Gran Tierra Agreement
and the Solana Agreement, respectively, pursuant to which: (1) for Putamayo Production that is to be exported through the Port
of Tumaco on the Pacific coast of Colombia, the sales point is designated as the Tumaco Port rather than a point in the Putamayo
basin and the price received is determined based on a "marker" price (based on the average export price of Ecopetrol
of the South Blend mix by the Port of Tumaco for the month of the crude delivery) less a port operation fee and a commercialization
fee; (2) for Putamayo Production sold for export through Ecuador, the price received is determined based on a "marker"
price (based on the weighted average price of exports by Ecopetrol of Crude Oriente through the port of Balao) less a transportation
fee, transportation tax and commercialization fee; and (3) for Putamayo Production sold at the DINA station in the Putamayo Basin
for export by the Port of Coveñas or for refining, the price received is determined based on a "marker" (based
on the average price of export of Grupo Empresarial crude mix Vasconia by the Port of Coveñas during the month of delivery)
with adjustments for quality and less transportation fees, transportation tax, a commercialization fee and port operation fee.
Pursuant to the amendments, the expiry dates of both the Gran Tierra Agreement and the Solana Agreement have been extended to
July 31, 2012.
Due to the change in the
sales point for Putamayo Production to be exported through the Port of Tumaco, Gran Tierra Colombia and Solana Colombia are currently
negotiating crude oil transportation agreements with Ecopetrol pursuant to which they would pay to Ecopetrol a transportation tariff
for the transportation by Ecopetrol of their Putamayo Production from the Putamayo Basin to the Port of Tumaco.
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: February 10, 2012