The current fill rate for the reserve, which contains more than 500 million barrels, is 75,000 barrels a day.

The field was discovered in 1981 and contains 350 million barrels of oil, of which just under one third is recoverable.

Based on the most optimistic projections, the gulf field contains 15 billion barrels, about 50 percent more than the nation's existing reserves.

The reserve, which has been tapped twice by the Bush Administration, contains nearly 600 million barrels.

It estimates that they could contain as much as 100 million barrels of recoverable oil.

The wildlife refuge may contain as much as three billion barrels.

The three oil fields estimated to contain 87 million barrels of oil.

But on climbing fifty feet up the crevice, a pool was found containing half a dozen barrels of water.

Lukoil's three main Caspian wells contain 359 million barrels of oil, less than analysts expected.

But if one does exist, the department says, it contains between 600 million and 9.2 billion barrels of oil.