Hmmz That's interesting with respect to EOR, do you have an official source that I can use in an upcoming publication(Liquids outlook 2007)? The claim with respect to Saudi Oil in Place has never been officially stated but can be indirectly deducted from other official statements such as Current estimates for OIIP is 700 billion barrels Past production is approximately 100 billion barrels Current reserves (official) are 260 billion barrels This gives a recovery factor slightly above 50%. Official reference is the presentation from Saleri and Baqi in 2004 for the CSIS, which can be found on the Saudi Aramco website: http://www.saudiaramco.com/sa/webServer/general/Summary_Fifty_Year_Crude_Oil_Supply.pdf This presentation also includes potential discoveries of 200 billion barrels OIIP, based on the USGS World Petroleum Assessment 2000 (88 billion barrels of new found recoverable reserves in Saudi Arabia). The increase in recovery factor has been stated in western newsitems by the upbeat oil minister Ali Naimi and by Saudi Aramco's production manager Mohammed al-Qahtan. Both have also referred to the case that oil won't run out until past 2080. Don't have a direct link but you can find one by googling probably. Reference was made in dutch news a while back, which I replied with sharp criticism directly to the journalist because he mixed up the difference between resources, proven reserves, recoverable reserves and probable reserves.