Why Arabia has the world's LARGEST oil reserves?

Why is there so much oil under the Arabian peninsula?
We explain the geological changes and reasons behind the oil abundance in the middle east.

References:
https://www.geoexpro.com/articles/2010/07/why-so-much-oil-in-the-middle-east
https://www.croftsystems.net/oil-gas-blog/how-was-oil-formed/
https://www.britannica.com/place/Tethys-Sea
https://www.britannica.com/place/Pangea
https://www.livescience.com/38218-facts-about-pangaea.html