The is an article on the Time of April 9th on Oil. Ot's called "The truth about Oil". Essentially it says that there is plenty of Oil, but cheap oil is finished. We all know that. What is more interesting is that on page 22 it haas a nice table with several sources of Oil, and for each source of Oil the price per barrel:
Texs: 300 billion barrels, cost 50$
Artic Offshor: 90 billion barrels, cost unclear above 100$
Brasil: 50-100 billion barrels, cost $45 to $65,
and so on.