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Source rock petroleum .The sedimentary rock or sedimentary rocks (Sedimentary rock) containing organic. When changing geological conditions. Under heat and pressure. These organic compounds will change and decay to petroleum.0.5% and in general should be more than 1.5% organic species Type II to crude oil (crude oil) Type III to gas volume of hydrogen in organic compounds should be more than 7% by weight. For the oil shale grey black or black, and they reef limestone.[petroleum].
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