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Rocks petroleum origin.Sedimentary rock (Sedimentary rock) or sludge with organic matter so much. When changing geological conditions. Under heat and pressure. These are organic compounds and degradation, petroleum. Rocks petroleum origin must be at least 0.5% of organic matter, and in General should be more than 1.5% organic matter Type II type gives crude oil (crude oil) Type III will give you gas. The quantity of hydrogen in organic compounds should be greater than 7% by weight for the occurrence of oil, black or black and gray schist and limestone reef rocks are the best petroleum origin [PI growing petroleum products]
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