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Το πετρέλαιο (πέτρας έλαιον στα αρχαία) είναι στην ουσία υγροποιημένος λιθάνθρακας γι’ αυτό και είναι καύσιμο.
Κατά 99% σχηματίστηκε από θαμμένα στα βαθύτερα στρώματα της Γης αρχαία δάση, όπου η άσκηση τρομερών πιέσεων μετασχημάτισε τα δέντρα και τα φυτά σε λιθάνθρακα υγροποιημένο.