I am not an astrophysicist but I am confident as to how the hydrocarbons were generated from this planet. If you are claiming that oil was formed in the mantle (laughable, by the way), please explain why there are no oil fields found below depths of 12,000’, maybe as deep as 18,000’ in cooler basins like South Louisiana? Zip, zilch, notta. The answer is that oil is not stable at those depths. It breaks down into lighter components like methane. So how can it come from the depths of the earth?
“...how can it come from the depths of the earth?”
Read up on the abiotic theory of oil. It’s far more persuasive than the dino theory.