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Stone origin petroleum
or sedimentary rocks (Sedimentary rock) with many organic materials. When changing geological conditions. Under heat and pressure. These organic compounds are transformed to petroleum and decay. Rock origins of petroleum must have the amount of organic matter by at least 0.5%, and in general should be more than 1.5% organic ingredients, the Type II will provide crude oil (crude oil) Type III is a gas volume of hydrogen in organic compounds should be more than seven. % by weight of an oil. Dark gray or black shale and rock reef limestone is mostly good petroleum origin. [Petroleum]
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