According to a report by the IEA last month, non-OPEC conventional crude oil production has peaked and non-conventional production will peak in the coming 5 years. The remaining growth is coming from bio-fuels and natural gas liquids.

Financial Times
Depending upon how fast we can mine and convert half-baked kerogen (tar sand) into liquid fuel or plumb the depths of the arctic, we, the non-OPEC nations of the world, are once again dependent on Export Land for that marginal barrel, that small excess supply that keeps the price plot from going vertical.
Recently, the King of Saudi Arabia quietly announced to a group of Saudi students studying in America, an end to new oil field development. He said he wanted to “... leave the underground wealth for our sons and their sons...” Whether that was just a PR talking point or not, the fact that it is reported at all (albeit obscurely) shows the importance of OPECs and in particular SAs spare capacity.
According to Jeffery Brown's Export Land Model, as an exporting country's internal demand grows and it's oil reserves deplete, there comes a point (long before the resource is exhausted) that exports stop. It only takes a little common sense to understand that it's cheaper to deliver a product closer rather than farther away, but more to the point, in most exporting countries today, the government controls the oil and uses the oil to control the population.
Of course keeping the US dollars flowing in is a good way to pacify a people and to that end Saudi Arabia announced it's intention to implement solar power as a replacement to oil fired desalinization plants - saving 1.5 million barrels of oil a day! The Saudis also are embarking on development of nuclear and other energy sources. Those alternatives (like in most countries) are far from replacing oil anytime soon but the sudden interest of SA, the UAE and other exporting countries in conserving their still vast reserves should be a hint to the importing countries that times are changing and the exporters are planning for a different future.
So that leaves us back at square one - except that this time it isn't just the US at peak production, its the entire non-OPEC world (aside from Canada tar) who will experience declining production. We are now completely reliant on OPEC for replacement of every barrel of conventional crude oil reserve depleted plus every barrel of demand growth desired. Of course this makes us vulnerable to politically motivated embargoes or physical disruption of supply from any exporting state but also decisions such as that hinted at by King Abdullah to "leave it in the ground".
Top 10 – Proven Oil Reserve Countries
Spare Capacity And Oil Price Dynamics, 2006 (Campbell on spare capacity in 2000 - the oil price figures are quaint!)
Oil Price History and Analysis, WTRG Economics
http://en.wikipedia.org/wiki/Export_Land_Model
http://en.wikipedia.org/wiki/1973_oil_crisis









