The occurrence of petroleumPetroleum arising from a deposit and degradation of organic substances from plants and animals, the layered sediments in the mash to the sand pebbles muck beneath the ground. Over time, millions of years, these sediments will sink down gradually due to the change of the surface world is packed with pressure and heat, as well as in areas where there is limited oxygen and thus decay transition as crude oil and natural gas inserts between the stones with capillary. Petroleum from different sources will be the quantity of hydrocarbon compounds including nitrogen, oxygen, and sulfur compound quantities vary depending on the type of plants and animals that is the origin of petroleum, as well as the influence of the tension piles on the sediments.
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