coal shale
... coal rank 煤品级 coal shale 煤质页岩 coal slack 煤矸石、煤屑 ...
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夹煤碳质页岩 bass
地质]烛煤页岩 cannel shale
·2,447,543篇论文数据，部分数据来源于NoteExpress
香溪煤系煤质较差，极不稳定，但该煤系暗色泥、页岩发育，演化程度较高，有利于形成煤成气。
The coal quality of Xiangxi stage is not good and stable but the coal appears dark mud, well develops shale and has high evolution level, which is favorable to create coal derived gas.
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