The "Empty Quarter" in Saudi Arabia may have zillions of barrels of petroleum. The area hasn't been touched yet. The Saudis WILL run out of petroleum, but not for another 200 years, by their estimate.
The "Empty Quarter" from the Internet:
The largest area covered by sand on the planet, the Empty Quarter encompasses 655, 000 sq km, an area larger than France or Texas. The breathtakingly sculpted sand dunes, for which the Empty Quarter is famous, can rise over 250m and form vast chains of longitudinal dune ridges, stretching over hundreds of kilometres, as well as individual barchan dunes. Shifted by the wind, sand dunes can move at a rate of up to 30m per year.
Once we reach our “oil independence” and figure out the best way to use NG or electrical for crusin, the ChiComs and socialist EU can have all the fun fighting over and harvesting the Empty Quarter.