Less than two years ago, Iraq launched one of the largest oil field auctions in the history of the petroleum industry. Amid red carpets and television cameras, top executives from the world's major energy giants - from Beijing to Houston, from Amsterdam to Kuala Lumpur - flew to Baghdad to take their seats at the live event, hoping to win a concession. On offer were some of the richest and potentially most fertile fields in the world, in a country that could one day emerge as the largest reserves holder in the world.