text: I think what you are referring to is oil shale, not the same as crude being pumped out of the ground by the familiar means, and I believe the US has the largest reserves and I just read that total WORLD reserves is "conservatively estimated at 2.6 trillion barrels". There is some reserves that are too deep to be mined economically, but overall, it is rather expensive to tap this oil resource.(http://emd.aapg.org/technical_areas/oil_shale.cfm). Somewhere along the line, you seem to have your information mixed up