More on Marathon Oil's (MRO) Q4 results: Total exploration costs doubled to $238M, prompting the 41% drop in net income. Income from exploration and production fell 10% to $501M. Oil and mining income dropped 70% to $19M; integrated gas income rose 75% to $35M. Projects 2013 production from upstream businesses 6%-8% higher Y/Y. Shares -2.8% premarket.