<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>011 - Disclosure - Note 7 - Asset Retirement Obligation</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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</LabelSeparator><Level>1</Level><ElementName>us-gaap_AssetRetirementObligationDisclosureAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Asset Retirement Obligation Disclosure [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_AssetRetirementObligationDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="c4_From1Jan2013To30Jun2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN: 0pt" id="PARA2793"&gt;

      &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;&lt;u&gt;Note

      7 &amp;#8212; Asset Retirement Obligation&lt;/u&gt;&lt;/b&gt;&lt;/font&gt;

    &lt;/p&gt;&lt;br/&gt;&lt;p style="TEXT-ALIGN: justify; LINE-HEIGHT: 1.25; TEXT-INDENT: 35pt; MARGIN: 0pt" id="PARA2795"&gt;

      &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;An

      obligation related to the future plug and abandonment of the

      producing oil wells in the Corvina and Albacora fields and

      the Pampa la Gallina well in Block XIX has been recorded in

      accordance with the provisions of ASC Topic 410, &amp;#8220;Asset

      Retirement and Environmental Obligations.&amp;#8221; ASC 410-20

      requires that an asset retirement obligation

      (&amp;#8220;ARO&amp;#8221;) associated with the retirement of a

      tangible long-lived asset be recognized as a liability in the

      period in which it is incurred and becomes determinable.

      Under this method, when liabilities for dismantlement and

      abandonment costs, excluding salvage values, are initially

      recorded, the carrying amount of the related oil and natural

      gas properties is increased. The fair value of the ARO asset

      and liability is measured using expected future cash outflows

      discounted at the Company&amp;#8217;s credit-adjusted risk-free

      interest rate. Accretion of the liability is recognized each

      period using the interest method of allocation, and the

      capitalized cost is depleted using the units of production

      method. Should either the estimated life or the estimated

      abandonment costs of a property change materially upon the

      Company&amp;#8217;s periodic review, a new calculation is

      performed using the same methodology of taking the

      abandonment cost and inflating it forward to its abandonment

      date and then discounting it back to the present using the

      Company&amp;#8217;s credit-adjusted-risk-free rate. The carrying

      value of the ARO is adjusted to the newly calculated value,

      with a corresponding offsetting adjustment to the asset

      retirement cost.&lt;/font&gt;

    &lt;/p&gt;&lt;br/&gt;&lt;p style="TEXT-ALIGN: justify; LINE-HEIGHT: 1.25; TEXT-INDENT: 35.3pt; MARGIN: 0pt" id="PARA2797"&gt;

      &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;Activity

      related to the Company&amp;#8217;s ARO for the six months ended

      June 30, 2013 and the year ended December&amp;#160;31, 2012 is as

      follows:&lt;/font&gt;

    &lt;/p&gt;&lt;br/&gt;&lt;table style="TEXT-INDENT: 0px; WIDTH: 80%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 10%; FONT-SIZE: 10pt; MARGIN-RIGHT: 10%" id="TBL4683" border="0" cellspacing="0" cellpadding="0"&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.1.lead.D2"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.1.amt.D2" colspan="2"&gt;

          &lt;p style="TEXT-ALIGN: center; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4663"&gt;

            &lt;b&gt;&lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;June

            30,&lt;/b&gt;&lt;/font&gt;&lt;/b&gt;

          &lt;/p&gt;

          &lt;p style="TEXT-ALIGN: center; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4664"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;2013&lt;/b&gt;&amp;#160;&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: medium none; TEXT-ALIGN: center; PADDING-BOTTOM: 1px; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.1.trail.D2"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.1.lead.D3"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.1.amt.D3" colspan="2"&gt;

          &lt;p style="TEXT-ALIGN: center; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4665"&gt;

            &lt;b&gt;&lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;December

            31,&lt;/b&gt;&lt;/font&gt;&lt;/b&gt;

          &lt;/p&gt;

          &lt;p style="TEXT-ALIGN: center; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4666"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;2012&lt;/b&gt;&amp;#160;&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: medium none; TEXT-ALIGN: center; PADDING-BOTTOM: 1px; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.1.trail.D3"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.2.lead.D2"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.2.amt.D2" colspan="6"&gt;

          &lt;p style="TEXT-ALIGN: center; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4667"&gt;

            &lt;b&gt;&lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;&lt;b&gt;(in

            thousands)&lt;/b&gt;&lt;/font&gt;&lt;/b&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: center; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt" id="TBL4683.finRow.2.trail.B3"&gt;

          &lt;b&gt;&amp;#160;&lt;/b&gt;

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 62%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom"&gt;

          &lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4668"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;ARO

            as of the beginning of the period&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.lead.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.symb.2"&gt;

          $

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.amt.2"&gt;

          2,708

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.trail.2" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.lead.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.symb.3"&gt;

          $

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.amt.3"&gt;

          1,304

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.3.trail.3" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom"&gt;

          &lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4671"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;Liabilities

            settled during period&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.lead.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.symb.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.amt.2"&gt;

          -

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.trail.2" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.lead.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.symb.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.amt.3"&gt;

          (2,093

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.4.trail.3" nowrap="nowrap"&gt;

          )

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom"&gt;

          &lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4674"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;Accretion

            expense&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.lead.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.symb.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.amt.2"&gt;

          114

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.trail.2" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.lead.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.symb.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.amt.3"&gt;

          89

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.5.trail.3" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom"&gt;

          &lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4677"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;Revisions

            in estimates during period&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.lead.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.symb.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.amt.2"&gt;

          -

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: medium none; TEXT-ALIGN: left; PADDING-BOTTOM: 1px; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.trail.2" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.lead.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: left; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.symb.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 1px solid; TEXT-ALIGN: right; BACKGROUND-COLOR: #ffffff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.amt.3"&gt;

          3,408

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: medium none; TEXT-ALIGN: left; PADDING-BOTTOM: 1px; BACKGROUND-COLOR: #ffffff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.6.trail.3" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

      &lt;/tr&gt;

      &lt;tr&gt;

        &lt;td style="TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom"&gt;

          &lt;p style="TEXT-ALIGN: left; LINE-HEIGHT: 1.25; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" id="PARA4680"&gt;

            &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;ARO

            as of the end of the period&lt;/font&gt;

          &lt;/p&gt;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.lead.2"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.symb.2"&gt;

          $

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.amt.2"&gt;

          2,822

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; PADDING-BOTTOM: 3px; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.trail.2" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.lead.3"&gt;

          &amp;#160;

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: left; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.symb.3"&gt;

          $

        &lt;/td&gt;

        &lt;td style="BORDER-BOTTOM: #000000 3px double; TEXT-ALIGN: right; BACKGROUND-COLOR: #cceeff; WIDTH: 16%; FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.amt.3"&gt;

          2,708

        &lt;/td&gt;

        &lt;td style="TEXT-ALIGN: left; PADDING-BOTTOM: 3px; BACKGROUND-COLOR: #cceeff; WIDTH: 1%; FONT-FAMILY: Times New Roman, Times, serif; MARGIN-LEFT: 0pt; FONT-SIZE: 10pt; VERTICAL-ALIGN: bottom" id="TBL4683.finRow.7.trail.3" nowrap="nowrap"&gt;

          &amp;#160;

        &lt;/td&gt;

      &lt;/tr&gt;

    &lt;/table&gt;&lt;br/&gt;&lt;p style="TEXT-ALIGN: justify; LINE-HEIGHT: 1.25; TEXT-INDENT: 36pt; MARGIN: 0pt" id="PARA2801"&gt;

      &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;The

      2012 revisions in estimates are due to the shift in timing of

      cash flows associated with expected payment of the ARO

      liability.&amp;#160; As the Company revised the estimated costs

      in 2012, the present value of the liabilities was adjusted

      and, as a result, the Company adjusted both the liability and

      capitalized asset by approximately $3.4 million, in

      accordance with ASC Topic 410.&lt;/font&gt;

    &lt;/p&gt;&lt;br/&gt;&lt;p style="TEXT-ALIGN: justify; LINE-HEIGHT: 1.25; TEXT-INDENT: 36pt; MARGIN: 0pt" id="PARA2803"&gt;

      &lt;font style="FONT-FAMILY: Times New Roman, Times, serif; FONT-SIZE: 10pt"&gt;Liabilities

      settled in 2012 include $2.1 million related to the sale of a

      49% participating interest in Block Z-1.&lt;/font&gt;

    &lt;/p&gt;&lt;br/&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 410

 -SubTopic 20

 -Section 50

 -Paragraph 1

 -URI http://asc.fasb.org/extlink&amp;oid=6392692&amp;loc=d3e7535-110849



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 410

 -SubTopic 20

 -Section 50

 -Paragraph 2

 -URI http://asc.fasb.org/extlink&amp;oid=6392692&amp;loc=d3e7569-110849



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