Double Eagle Energy Holdings and private equity firm Apollo Global Management have formed a partnership to invest in oil and natural gas properties in Oklahoma, focusing primarily on the Anadarko and Ardmore basins. Fort Worth, TX-based Double Eagle already has more than 500,000 acres across Texas and the Midcontinent, according to Co-CEO Cody Campbell. The partnership with Apollo “will provide a great opportunity to expand and continue our land-centered approach to oil and gas asset acquisition, which has proven successful over the last several years,” he said. Last year, Apollo led a consortium of private equity investors in a $7.15 billion leveraged buyout of El Paso Corp.’s exploration and production business, which included an array of liquids-rich U.S. unconventional property extending across Texas, Louisiana, the Raton Basin and the Rocky Mountains (see Shale Daily, Feb. 28, 2012).