Thanks for your response.  But how flexible are all these variables?  Could Ghawar, for example, have been substantially exhausted within 10 years of the first well drilled if there had been 50 or 100 times as many wells drilled as there actually were?
In a nutshell - yes.

The more straws in the milkshake, the sooner you hear the slurping sounds.

But if some slurpers get head-freeze and their consumption drops there will be a delay until you hear the slurping sounds.  And if one person is a head-freeze recessive mutant and therefore can suck down the milkshake at a rate 10X that of everyone else...

sluuuuurrrrrrrrrrrrrp!**

well yes  in theory   but would the oil market absorb this level of production (supply)