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Petroleum exploration in the Colombian Caribean relative to the Tayrona Block has been taking place since 2004 with the drilling of 4 wells and the occurrence of two gas discoveries in turbiditic sandstone reservoirs from the Lower Miocene – Upper Oligocene. The results of the molar and isotopic composition of these gases found in sandstone reservoirs suggest a biogenic origin with a predominance of isotopically light methane, with the main processes of methane formation relative to CO2 bacterial reduction. This exploratory frontier in the Offshore Colombia can host significant volumes of dry gas mainly in the Cenozoic sedimentary section (>20 TCF).