MADRID, Jan 5 (Reuters) - Spain"s Repsol (REP.MC) has bought shale oil and gas assets from U.S. firm Rockdale Marcellus for $222 million, a company spokesperson said, confirming a report from Marketline. Repsol will pay $220 million in cash and assume an additional $2 million in debt, he said. The assets were sold by Rockdale Marcellus as part of a Chapter 11 process. The assets are located near an area in Pennsylvania where Repsol already operates a shale field.