The Guardian | Shell's BG takeover has oil industry asking who's next The Guardian The last round of energy industry takeovers was in the late 1990s when new production in the North Sea, Alaska and Mexico caused the oil price to collapse. In response, BP bought Amoco and Arco, Exxon snapped up Mobil to form the world's biggest oil ... A new era of oil mega-mergers? Shell swallows BG for $70 billion Future oil sector mergers set to be more modest 5 Things to Know About the Biggest Oil Deal in a Decade |