I finnaly saw some evidence that could a threat to the oil bull. Still the study analyzed oil fields that produce 60% of world's output and concluded that production is declining just not as fast as some thought
http://business.timesonline.co.uk/tol/business/industry_sectors/natural_resources/article3207311.ece
http://business.timesonline.co.uk/tol/business/industry_sectors/natural_resources/article3207311.ece