Nice knowing that if the price of oil were to go up, we'd still have that as another reserve were it to become economical. I know we shouldn't necessarily count on it, but we shouldn't count it out either.
There is also the amount of hydrocarbons in frozen methane on the sea floor. Something like more hydrocarbons than humanity has ever burned of any type in human history. Japan has a program to develop them. Or the large amount of methane on Titan, another far off future possibility. Now we may actually develop an alternative before those come up. I don't know.
I read up on this stuff quite a bit back in the late 2000's because there was a lot of talk then that we were at peak oil.
I have a book in my office entitled "When the oil runs out". Published in 1947.
We've shied from the looming disaster of 'peak oil' before, and somehow managed to come out of the situation with more production than ever.
Keep in mind that some of the reasons for oil to be 'scarce' are completely artificial.
COVID led to a shortfall in domestic production because a tremendous number of stripper wells (ones which produce under 20 bbls of oil per day) were plugged and abandoned when the price bottomed (actually went negative, briefly). They will likely never be put back on line, as recompletion would cost more than any foreseeable production would bring in. It isn't much to plug one well, but the cumulative effect led to a drop in overall production of roughly 1.5 million barrels per day. The tar sands oil brought in by the Keystone XL Pipeline would have compensated, some 850,000 BOPD brought in from Canada, but Biden killed the project on day one.
The Arab Oil Embargo was another artificial shortage, and led to an oil boom here in the US.
Alaska has a lot of oil untapped, too, but ANWR, or at least the tiny fraction that has been explored with a drill bit, has been severely restricted, too. Again, by the Biden Administration.
We likely have another shortage in the pipeline, as the Biden Administration has consistently failed to let out for bids the statutorily required offerings from Federally owned lands, which are roughly half the land west of the Mississippi.
In all, policy is more damaging than geology.