low rank coal 低煤阶煤 ; 低煤化度煤 ; 低阶煤 ; 低煤级煤
low rank bituminous coal 低级无烟煤
low-rank coal 低阶煤 ; 低级煤
low-medium rank coal 中低煤化阶段煤
low-rank coal reservoir 低煤阶煤储集层
low rank coal reservoirs 低煤级煤储层
low-rank coal in India 印度劣质煤
low rank soft coal 低阶烟煤
low-rank coal-bed methane 低煤阶煤层气
Enrichment and accumulation of coalbed methane in low rank coal have their own unique characteristics.
低煤阶煤层气富集成藏具有自身独特的特点。
The reservoirs of the medium rank coal characterize low gas content, low gas saturation, good permeability, and high energy in Hedong area of Shanxi, China.
中国山西河东地区中阶煤储层的含气量比较低、含气饱和度低，而储层渗透性好，储层能量比较大；
The resources of low rank coal in the world have introduced in this paper.
本文介绍了世界低煤阶煤炭资源及其分类。
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