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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 16, 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: 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">Nevada</P></TD>
    <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">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 2">&#163;</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 2">&#163;</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>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 2.05pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 2.05pt"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 2.05pt">&nbsp;</P>

<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-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">As previously disclosed,
on February 7, 2012, 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 with Ecopetrol pursuant to which, among other things, they agreed
to sell to Ecopetrol 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;). Under these agreements, a portion
of the Putamayo Production is to be exported through the Port of Tumaco on the Pacific coast of Colombia, and the sales point is
designated as the Tumaco Port. Under prior agreements the point of sale had been a point in the Putamayo basin at which the oil
was delivered to Ecopetrol&rsquo;s pipeline. As a result of the shift of the point of sale to the end of Ecopetrol&rsquo;s pipeline,
on February 16, 2012, Gran Tierra Colombia and Solana Colombia entered into agreements with Ecopetrol, dated as of January 30,
2012, pursuant to which the Putamayo Production to be exported through the Port of Tumaco will be transported by Ecopetrol through
Ecopetrol&rsquo;s pipeline and Gran Tierra Colombia and Solana Colombia will pay to Ecopetrol a transportation tariff for this
transportation through its pipeline. The estimated value of each contract is approximately $6.75 million. Under these agreements,
Ecopetrol is liable for risk of loss of oil during transportation only if Ecopetrol fails to take reasonable measures to operate
the pipeline or is grossly negligent. The agreements have expiration dates of July 29, 2012.</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"></P>

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<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 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"></P>

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

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<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="padding: 0; text-indent: 0">Gran Tierra Energy Inc.</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0; width: 57%">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 5%">By:</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; padding: 0; text-indent: 0; width: 32%">&nbsp;/s/ David Hardy&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 6%">&nbsp;</TD></TR>
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    <TD STYLE="width: 57%; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="width: 5%; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="width: 7%; padding: 0; text-indent: 0">Name:</TD>
    <TD STYLE="width: 31%; padding: 0; text-indent: 0">David Hardy</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">Title:</TD>
    <TD STYLE="padding: 0; text-indent: 0">General&nbsp; Counsel, Vice President, Legal and Secretary</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></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;Dated:&nbsp;February 16&#9;, 2012</P>

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

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[{"type": "8-K", "sequence": "1", "filename": "v303104_8k.htm", "description": "FORM 8-K", "secsgml_size_bytes": 13837}]
{"company-data": {"conformed-name": "GRAN TIERRA ENERGY, INC.", "cik": "0001273441", "assigned-sic": "1311", "irs-number": "000000000", "state-of-incorporation": "NV", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-34018", "film-number": "12622692"}, "business-address": {"street1": "300, 611-10TH AVENUE S.W.", "city": "CALGARY", "state": "A0", "zip": "T2R 0B2", "phone": "(403) 265-3221"}, "mail-address": {"street1": "300, 611-10TH AVENUE S.W.", "city": "CALGARY", "state": "A0", "zip": "T2R 0B2"}, "former-company": [{"former-conformed-name": "GOLDSTRIKE INC", "date-changed": "20040113"}, {"former-conformed-name": "GOLKSTRIKE INC", "date-changed": "20031216"}]}
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 16, 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 February 7, 2012, 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 with Ecopetrol pursuant to which, among other things, they agreed
to sell to Ecopetrol 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
"). Under these agreements, a portion
of the Putamayo Production is to be exported through the Port of Tumaco on the Pacific coast of Colombia, and the sales point is
designated as the Tumaco Port. Under prior agreements the point of sale had been a point in the Putamayo basin at which the oil
was delivered to Ecopetrol's pipeline. As a result of the shift of the point of sale to the end of Ecopetrol's pipeline,
on February 16, 2012, Gran Tierra Colombia and Solana Colombia entered into agreements with Ecopetrol, dated as of January 30,
2012, pursuant to which the Putamayo Production to be exported through the Port of Tumaco will be transported by Ecopetrol through
Ecopetrol's pipeline and Gran Tierra Colombia and Solana Colombia will pay to Ecopetrol a transportation tariff for this
transportation through its pipeline. The estimated value of each contract is approximately $6.75 million. Under these agreements,
Ecopetrol is liable for risk of loss of oil during transportation only if Ecopetrol fails to take reasonable measures to operate
the pipeline or is grossly negligent. The agreements have expiration dates of July 29, 2012.
2
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 16	, 2012
3