Coal is a sedimentary rock composed principally of organic carbonaceous macerals and inorganic minerals.
煤是一种有机沉淀岩，主要包括有机碳化合物和无机矿物。
Gloeocapsomorpha prisca is one of important sedimentary organic matter of Ordovician's Marine carbonate source rock in Tarim basin, even all over the world.
粘球形藻是塔里木盆地奥陶系海相碳酸盐岩烃源岩和全球奥陶系烃源岩的重要生烃母质。
The organic matter abundance of sedimentary rock is low, and there is basically no effective source rock.
沉积岩的有机质丰度低，基本无有效生油岩发育。
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