It seems like abiotic oil and abiogenic oil are really misnomers.
What actually happens is that gas (methane, ethane) forms in the hot zone of the crust.
This Thermogenic gas then rises through cracks or porous minerals including sand.
When it gets to and impervious layer of rock, it can collect and through pressure and time
Become liquid petroleum.
If it comes up under the ocean, then it forms methane hydrates or clathrates, solid substances that can be mined and transformed into gas by simple heating.
The Athabaska Tar Sands of Northern Alberta in Canada
Are the first place where researchers realized that oil was forming deep in the crust and percolating upwards.
Interestingly, every pipeline out of this huge reserve of petroleum
Has been controversial and dogged by protests
Especially the Keystone pipeline which would bring that petroleum to the refineries of Texas
It's as if someone did not want this source of petroleum to develop too much
Because it was too big
And made the claims about peak oil
Look like silliness.
But now we know
And there are many more thermogenic oil deposits being developed
Around the world.
Petroleum is still abundant
And may even exist on the Moon
But it is almost certainly going to be found
On Mars.
The Best Is Yet To Come
Thermogenic Formation of Hydrocarbons in Sedimentary Basins
https://link.springer.com/referenceworkentry/10.1007%2F978-3-319-54529-5_15-1
A short introduction into the occurrence and bulk composition of thermogenic hydrocarbons as a fraction of natural petroleum in sedimentary basins is given. The main driving forces for the generation of thermogenic petroleum besides temperature, namely, time, pressure, and catalysts, are discussed as well as basic reaction mechanisms. The main part describes classical and novel analytical methods used to assess timing, amount, and composition of generated petroleum as a function of organic matter type and maturity. Recent work is presented and research needs are identified.