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Petroleum (L. petroleum, from Greek: petra (rock) + Latin: oleum (oil)[1]) or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. Petroleum is recovered mostly through oil drilling.This latter stage comes after studies of structural geology (at the reservoir scale), sedimentary basin analysis, reservoir characterization (mainly in terms of porosity and permeable structures).[2][3] It is refined and separated, most easily by boiling point, into a large number of consumer products, from gasoline and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals.[4] Petroleum is often attributed as the "Mother of all Commodities" because of its importance in the manufacture of a wide variety of materials.

Good question I don't know if this helps

Geologist say the micro plants and anamials living in the ocean died and settled to the bottom over time a lot of time they were compressed by setiments and pressure along with heat from the earth worked its magic and the rest is history unfolding as we speak

DONT BUY INTO THIS MILLIONS OF YEARS THE EARTH ISNT THAT OLD BUY INTO A BIG FOOD 5000 YEARS AGO THAT CAUSED THE SAME EFECTS.