The petroleum , petroleum caused by the deposition and decomposition of organic substances from plants and animals mixed with gravel, sand and silt in the muck beneath the ground. Over time, tens of millions of years, these sediments are settling down. Because of changes in the Earth's surface Was packed with pressure and heat. Including in areas with limited oxygen. It decomposes transformed into oil and natural gas inserted between layers of porous rock. Petroleum from different sources, the amount of hydrocarbons, including the amount of sulfur, nitrogen compounds. And different oxygen Depending on the type of plant and animal origin of petroleum is. The strong influence of the deposition of the sediments.
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