Investor Presentaiton

No. of wells Increasing E&P activity in Colombia Exploration wells and success rates in Colombia 250 200 48% 46% 70% 56% 58% 60% 48% 48% 50% 40% 40% 150 33% 41% 39% 108 30% 98 100 21% 14% 56 70 10 20% 64 45 56 73 51 10% 28 35 38 50 21 41 28 18 14 34 10 63 0% 19 47 22 11 36 35 12 29 12 10 16 22 0 -10% 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 Producer Dry -Tech Success Rate Source: ANH 60% Years Tech. Success Rate 7

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