Marathon Oil is said to be seeking bids for its interest in four onshore exploration blocks in East Africa.
The company is looking to focus on its blocks in the US shale formations.
Marathon, like a number of other US oil and gas companies, plans to direct more capital into formations such as the Eagle Ford in South Texas.
Production growth in the region tends to give higher returns.
The company will be taking offers for all or part of the properties located in Ethiopia and Kenya according to reports.