howmuch oil in 45 sqkm x 70mtr of vugular rock, page-13

Saudi Aramco has stated that it has more than 71 billion barrels of proven reserves remaining. Matthew Simmons, in his book Twilight in the Desert, suggests that production from the Ghawar field and Saudi Arabia, may soon peak.[7] However, Simmons' work has been strongly criticised by Saudi Aramco officials such as Nansen Saleri.

When appraised in the 1970s, the field was assessed to have 170 billion barrels of original oil in place, with about 60 billion barrels recoverable (1975 Aramaco estimate quoted by Matt Simmons). The second figure, at least, was understated, since that production figure has already been exceeded