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对内蒙古乌达矿区主采煤层９煤层的煤岩学特征和煤相进行了分析，用煤样密度组成的煤岩学方法讨论不同煤相煤的可选性。研究表明，相同煤相不同煤的可选性相似，聚煤环境决定了煤中矿物的含量和赋存状态，同时也决定了煤的可选性。高位泥炭沼泽形成的煤可选性好，而低位泥炭沼泽形成的煤可选性差。
The coal petrological characteristics and coal facies of the 9th coal seam of the main coal seam in Wuda, Inner Mongolia were analyzed. The coal-rock characteristics of different coal-phase coals were discussed with the coal-rock method of coal-like density. The results show that the coal selectivity of the same coal is similar to that of different coal. The coal accumulation determines the content and occurrence of minerals in the coal, and also determines the coal selectivity. The high peat bogs formed coal with good coal selectivity, whereas the low peat bogs formed poor coal selectivities.