Reply #35: Oh yeah...

[Solon]

In Ghawar, the largest single oil field in the world, a full one third of what they extract is sea water that they pumped in in the first place to get at whats left. Remember Oil floates on water. Also, technology only goes so far, you can only squeeze the sponge so many ways before it is simply not worth the effort anymore. As far as the untapped reserves, they are there, and they probably will remain untapped for a while, because they are horrendiously expensive to even get to, like near the north pole, and also don't have nearly enough oil to even be cost effective, till oil prices skyrocket to twice what they are today.