There is such a theory, Thomas Gold thought that hydrocarbons came from underneath and then was processed by the metabolism of bacteria living far beneath the s

There is such a theory, Thomas Gold thought that hydrocarbons came from underneath and then was processed by the metabolism of bacteria living far beneath the surface. He later wrote a book about the theory called "The Deep Hot Biosphere". He turned out to have been right about deep life at least. Here is a retrospective: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5502609/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5502609/