In his recent post, Ace assumes ultimate recoverable reserves (URR) in Saudi Arabia to be 175 Gb (billion barrels). With 112 Gb already produced, that leaves only 63 Gb remaining. Colin Campbell (the founder of ASPO) has estimated total reserves for Saudi Arabia of 275 Gb (news letter 66), believed to be C+C+NGL (crude oil + condensate + natural gas liquids). There is an enormous discrepancy between this and Ace's analysis that ought to be explained.

This post is a brief summary of my views on Saudi reserves and production. My conclusion is that Saudi Arabia likely has at least 120 Gbs of remaining reserves (C+C+NGL) for a URR in excess of 240 Gbs (C+C+NGL). The remaining reserves according to this analysis are almost double those reported by Ace.