the abiogenic petroleum origin of oil is one of the most fascinating theories - put forth by thomas gold in the book "The Deep Hot Biosphere: The Myth Of Fossil Fuels"

"Some meteorites, such as carbonaceous chondrites, contain carbonaceous material. If a large amount of this material is still within the Earth, it could have been leaking upward for billions of years."

"oil and gas did not originate from fossil deposits, but have instead originated from deep carbon deposits, present since the formation of the Earth"