It has to." Until now, the U.S shale gas plays have been driven by independent producers such as XTO, Chesapeake Energy Corp., EOG Resources Inc., and Devon Energy Corp. But cheap current prices and the long term value embedded in the North American unconventional gas fields could tempt other supermajors, including Royal Dutch Shell PLC, BP PLC and Total SA, said Fadel Gheit, New York based analyst with Oppenheimer and Co. "The buyers will be the large integrated oil companies, and the sellers will be the large [exploration and production] companies," he said. "None of the majors have enough [exposure to the shale gas]. … Right now, they are running out of options."