The review comes a month after South America-focussed Amerisur partnered with U.S.-based Occidental Petroleum Corp on four exploration and production blocks in southern Colombia, near the border with Ecuador.

"In light of the high level of recent activity in the Colombian E&P sector, it has decided to conduct a formal review of the various strategic options available to the company to maximise value for shareholders," Amerisur said in a statement.

The company did not provide further details on the proposal or interested parties.

Amerisur's board has appointed BMO Capital as its financial adviser with regards to the sale process, the company said.

(Reporting by Yadarisa Shabong in Bengaluru; editing by Gopakumar Warrier)