In this video, Motley Fool Energy Analyst Joel South takes a look at the earnings of Marathon Oil (MRO 0.07%), and talks about why now might be an exciting time to buy. The company is making reinvestments into capital expenditures aimed at growth, not only domestically, in the Eagle Ford and Bakken shales, but also abroad. It has an eye on doubling its Libyan production over the next four years. This can only mean increased output and more value for investors in the years to come.