The only constraint to oil and gas occurrence posed by depth is temperature/temperature gradient (assuming permeability and hydrocarbon generating system is present). Gas wells at 5 and 6,000 m in many parts of the world are common.
from
https://wattsupwiththat.com/2019/04/17/the-worlds-deepest-oil-well-how-bad-science-spreads-on-the-internet/
The measured depth (MD) of “the world’s deepest oil well” is over 40,000′. However, the true vertical depth of “the world’s deepest oil well” is only about a very unremarkable 11,000′ deep… The Z-44 well was designed for a horizontal completion, so its measured depth was exceptionally long. It’s not only not “the world’s deepest oil well,” it’s about 20,000′ shy of the deepest oil well in the Gulf of Mexico, possibly deepest in the world. BP’s Tiber discovery on Keathley Canyon Block 102 logged oil pay below 30,000′ TVD. Despite its depth, the bottomhole temperature was only about 280 °F, within the oil window. This discovery has yet to be developed. However, there are quite a few oil wells in the Gulf producing from oil reservoirs at true vertical depths of 20,000′ to 28,000′. All of these have bottomhole temperatures less than 300 °FDeeper wells have been drilled for natural gas.
One of the more interesting was the Lone Star Producing Company’s Bertha Rogers #1 in the Anadarko Basin of Oklahoma. On April 13, 1974, Bertha Rogers No. 1 reached a total depth of 31,441 feet – where it encountered liquid sulfur. According to Lone Star Producing Company, the bottom hole pressure and temperature were an estimated 24,850 pounds per square inch and 475 degrees Fahrenheit respectively. It required about eight hours for bottom hole cuttings to reach the surface almost six miles above.
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