end of the petroleum age:
Though the world possesses tens of thousands of operating fields, a mere 116 of them – each producing more than 100,000 barrels per day – together account for nearly one-half of total global output. Of these, all but a handful were discovered more than a quarter of a century ago, and most are showing signs of diminished capacity. Indeed, some of the world’s largest fields – including Ghawar in Saudi Arabia, Burgan in Kuwait, Cantarell in Mexico, and Samotlor in Russia – appear to be now in decline or about to become so. The decline of these giant fields matters greatly. Compensating for their lost output will take increased yield at thousands of smaller fields, and there is no evidence that this is even remotely possible.
(...) We could live with the decline of these great reservoirs if we had some confidence that new reserves were being discovered all the time to replace all those now reaching the end of their productive life. But this is not the case. Despite a sharp increase in spending on exploration and development, the rate of new reserve discovery has been falling steadily for the past 30 years. According to the U.S. Army Corps of Engineers, the last decade in which new discoveries exceeded the rate of extraction from existing fields was the 1980s. Since then we have been consuming more oil than we have been finding – a pattern that can only result, eventually, in the complete exhaustion of the world’s known petroleum reserves.
(...) But more and more analysts are coming to the conclusion that the output of conventional (i.e., liquid) petroleum will peak at about 95 million barrels per day in the 2010-2012 time-frame and then begin an irreversible decline. The addition of a few million added barrels from Kashagan or Tupi will not alter this trend.
(...) Consider: In 2030, according to the U.S. Department of Energy, world “liquids” demand is expected to reach 117.6 million barrels per day. Of this amount, unconventional fuels – synthetic liquids derived from tar sands, shale rock, and biofuels – may provide a total of 10.5 million barrels. That leaves 107.1 million to be supplied by conventional petroleum. But what if global oil output has fallen to 60-70% of that amount by 2030, as projected by many analysts? Under those circumstances, no amount of oil from Alaska or the outer continental shelf will be able to save this country (or the rest of the world) from a catastrophic energy crisis.