Shell, Exxon Tap Oil Sands, Gas as Reserves Dwindle
A 15-year decline in oil reserves is spurring companies such as Royal Dutch/Shell Group, Exxon Mobil Corp. and ChevronTexaco Corp. to spend $76 billion in the next decade to boost supplies of oil from tar sands and diesel fuel from Qatari natural gas. Oil executives say they have no choice but to try alternatives to drilling because there is not much more crude to be found in their current fields.


