Back in earlier geologic periods when the earth was warmer and CO2 levels were higher, there were large warm shallow seas in the basins. These conditions combined with sunlight would generate huge algae growth. Some might say continuous algae blooms, followed by die offs. The algae would settle and be covered over cutting off oxygen. Then under time, temperature and pressure, oil is created.
So we produce oil/gas from these basins like the Permian Basin, the Williston Basin, or the Fort Worth Basin.
I'm not aware of any oil companies producing abiotic oil.
Can’t we have both? A nearly inexhaustible supply of methane deep down plus biological activity? What do you think about deep-water wells miles offshore? Do you think the planet is growing (expanding)?
How did that algae grow on Titan?