[igravious]

That's the question: why would it become uneconomical to extract and process?

https://www.worldometers.info/oil/

47 years of oil left given current reserve estimates, I'd bet my life there's a couple of centuries left at least

Interesting top 11:

    1  Venezuela       299,953,000,000  18.2%   sanctions/attempted coup
    2  Saudi Arabia    266,578,000,000  16.2%   strategic ally (petrodollar)
    3  Canada          170,863,000,000  10.4%   neighbour
    4  Iran            157,530,000,000  9.5%    sanctions/coup
    5  Iraq            143,069,000,000  8.7%    invaded
    6  Kuwait          101,500,000,000  6.1%    friendly relations
    7  U.A.E            97,800,000,000  5.9%    friendly relations
    8  Russia           80,000,000,000  4.8%    sanctions/global rival
    9  Libya            48,363,000,000  2.9%    bombed/destabilized
   10  Nigeria          37,070,000,000  2.2%    friendly?
   11  United States    35,230,000,000  2.1%    *ahem*

[ZeroGravitas]

It will become uneconomical because making the same chemicals, or better replacements, with renewable energy will be cheaper:

https://www.enapter.com/newsroom/reaching-price-parity-of-gr...

[eru]

Reserves are misleading. Because people only declare resources to be reserves that have had enough investment in them to be proven to some level.

See https://www.adamsmith.org/research/the-no-breakfast-fallacy for more background.