That the oil is there waiting to be tapped is not the critical factor. It's a matter of the rate at which it can be extracted and what it costs to extract it. There is a reciprocal relationship between the two, as DavidS pointed out on page 2 of this thread:
He went on to ask:
Poke a hole into a previously untapped pocket of oil and the stuff literally comes gushing out -- at first. Keep drilling more holes and extracting more oil and the pressure starts to drop (plus, the stuff gets thicker toward the bottom). Once the point of diminishing returns is reached, there's no longer an advantage in drilling more holes, though you can continue to work the ones already in place. Eventually, even that ceases to be worthwhile, as the amount of energy it takes to extract what's left becomes greater than what you'd get out of it after refining. Somewhere in between, there's a point where the price being offered has to be very high in order to make continued effort profitable. That is when you start thinking about packing it in. Hubbert's insight was that the same relentless mathematics of this apply without regard for the size of the source being tapped (and ultimately to global production as a whole).
So I would ask: Does it really matter whether production peaks at the point where the average energy return reaches neutral or at the point where economies are no longer strong enough to provide the impetus to continue investing in more infrastructure?
How close we are [to peak oil] depends strongly on how much you're willing to pay. Seriously -- nobody's going to spend several billiion dollars to develop an oilfield under a mile and a half of ocean a hundred miles from land unless they're fairly confident the oil it will produce can be sold for enough money to make it worth doing.
He went on to ask:
Besides, does it really matter whether production truly hits a peak or simply gets outrun by demand?
Poke a hole into a previously untapped pocket of oil and the stuff literally comes gushing out -- at first. Keep drilling more holes and extracting more oil and the pressure starts to drop (plus, the stuff gets thicker toward the bottom). Once the point of diminishing returns is reached, there's no longer an advantage in drilling more holes, though you can continue to work the ones already in place. Eventually, even that ceases to be worthwhile, as the amount of energy it takes to extract what's left becomes greater than what you'd get out of it after refining. Somewhere in between, there's a point where the price being offered has to be very high in order to make continued effort profitable. That is when you start thinking about packing it in. Hubbert's insight was that the same relentless mathematics of this apply without regard for the size of the source being tapped (and ultimately to global production as a whole).
So I would ask: Does it really matter whether production peaks at the point where the average energy return reaches neutral or at the point where economies are no longer strong enough to provide the impetus to continue investing in more infrastructure?