This is part of what the problem was - I was taking this into consideration (any hydrocarbon polymer is feed stock). It also was never just oil that...
You also suggested that you couldn't see how it might have accumulated bioticaly, lending credence to abiotic oil. But there's something you need to...
Once CO2 dissolves in waTer, it can react wwith calcium silicate rocks to produce calcium carbonate, which is precipitated and sequestered. It is my...