Marathon Oil will allocate US$2 billion – the bulk of its capex – for the development of its oil-producing assets at home, in the STACK play, Eagle Ford, and the Bakken, the company said in a press release. International operations will be allocated less than 10 percent of the total budget for the year, which is set at US$2.2 billion. Chief executive Lee Tillman said the focus on production at home is motivated by the opportunities for higher returns in the assets it operates. Special attention will be paid to asset development in the…