Petroleum and Natural gas

Petroleum (crude oil) and natural gas are found in commercial quantities in sedimentary basins in more than 50 countries in all parts of the world.

The largest deposits are in the Middle East, which contains more than half the known oil reserves and almost one-third of the known natural-gas reserves.

The United States contains only about 2 percent of the known oil reserves and 3 percent of the known natural-gas reserves.