Investor Presentaiton

Ecopetrol's Oil & Gas discoveries in Colombia 2008-2011 Discoveries in Colombia 2008-2011*: 2008 Arrayan-1 Lisama Norte Pachaquiaro norte-1 Tempranillo-1 Quifa-5 Saman 2009 Quiriyana-1 Quifas 7,8,9 Tempranillo norte 2010 Akacias-1 Oripaya-1 Tinkhana-1 Quifa-6 2011 Pinocho Rumbero Nunda Fauno-1 Mito-1 CSE-8 CSE 8ST1 Trasgo-1 Azabache-1 Opalo-1 Bonga-1 Guarrojo Este-1 *Includes only A3 and A2 wells. Source: Ecopetrol Rio Zulia West 3 Lisama Norte Oripaya Rumbero Pacha- Azabache-1 quiaro Guarrojo E-1 Akacias Norte Pinocho Quifa9 CSE-8 Quifa6, Quifa 5 Mito Tempranillo Norte Fauno Quifa Quifa 8 Opalo-1 CSE 8ST Tempranillo-1 TRASGO Arrayar Nunda Quriyana Tinkhana 60% Years 23

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