Funny...I was just reading an article in Time about the "oil sands" of Northern Alberta about an hour ago. I was not aware they were producing so much oil. Looks like they intend to increase production a lot in the coming years.
I believe Saudi Arabia is #1 in proven reserves and Canada is #2, but from what I've read or heard, there's some questionable methods as to how the Saudi's arrived at their figures. A country that pumps the most BBL per day and the country that has the greatest reserves yields a considerable amount of power, so I could see how they would fudge those numbers.
Something that is real interesting is that if the Saudi's reserves aren't what they say they are, then they will be de-throned as a very powerful country due to their oil. Since the U.S. has very close ties to the Saudi's, what the U.S. wants and what the Saudi's says goes. They say they will sell their oil with the dollar (pegging oil-dollar), but if someone else takes over #1, this can and will most likely change. This will dramatically effect the dollar, as the euro will take its place. The dollar is already dropping and if the euro is pegged to oil, the dollar will no longer be a standard.
Some countries have already been selling their oil with the euro, i.e. Iraq. We saw what happened to them. Venezuela has also speculated selling their oil in euros, and the U.S. government has tried to overthrow Chavez more than once.
Russia I believe is the #2 exporter, if Saudi production drops below that of Russia's, I almost guarantee that Russia will demand that they receive euros for their oil. Imagine a futures contract where a BBL of oil is bought at $100 per. Well when that contract comes up, the recipient will get a depreciated dollar. That loss, although just a fraction of the dollar, maybe 0.01% comes out to a loss of 10 million dollars.