I just read http://www.energybulletin.net/4559.html
New article by Simmons. At the bottom paragraph is says:
If any spare wellhead capacity still exists, it is for crude that is both heavy and sour. The refineries that are equipped to refine this type of crude are currently operating at 100% capacity. Compounding this problem is the fact that the world's light sweet crude supply is also in decline. Almost 90% of new oil projects produce oil that is either sour, heavy, or both.
Anyone who knows more about this? It's quite mindblowing that 90% of new oil projects are either sour or heavy or both.