The Río Paez block is located in in the Upper Magdalena basin and contains the La Cañada Norte and La Hocha fields. The upside is limited and the operator is focused on managing decline. The fields are located at the southern end of the Upper Magdalena basin. The Cretaceous Caballos sands act as the primary reservoir which produces from three intervals at a depth of between 700 and 800 metres. Exploratory drilling also revealed oil of around 34 API in the Monserrate formation.