The agreement will give the Colombian state-backed oil company and US player each a 50% stake in the Fuerte Norte and Fuerte Sur blocks, Ecopetrol said in a statement.
The companies have also submitted a joint 50-50 offer for the adjacent Purple Angel block, accepted by Colombia's National Hydrocarbons Agency (ANH).
More than 5300 square kilometres of 2D and 4000 kilometres of 3D seismic have been completed on the Fuerte Norte and Fuerte Sur blocks, which are 481,000 and 330,000 hectares respectively.
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