U.S. reports from Saudi Arabia in 2009 were released by WikiLeaks . Former Aramco executive predicted a slow decline in Saudi oil output after 2020 . And they are not big enough to alter the fundamental picture with `` super-fields '' like the Ghawar field in Saudi Arabia beginning to decline . Sadad al - Husseini disagreed with estimates of as many as 300 billion barrels of oil . 2009 report quoted analysts who say nuclear power is kingdom 's only way to meet demand .
U.S. reports from Saudi Arabia in 2009 were released by WikiLeaks . Former Aramco executive predicted a slow decline in Saudi oil output after 2020 . Sadad al - Husseini disagreed with estimates of as many as 300 billion barrels of oil . 2009 report quoted analysts who say nuclear power is kingdom 's only way to meet demand .