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1·Affected by different geologic factors, coal bed gas may be enriched and burst out in the low-rank coals.

由于各种地质因素的影响，低煤级煤煤层将有可能出现煤层瓦斯富集而发生瓦斯灾害的危险。

2·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。

3·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；

4·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。

5·And the reservoirs of the high rank coal characterize low gas saturation, low permeability, and low energy in the south of Qinshui basin, Shanxi.

山西沁水盆地南部高阶煤储层的含气饱和度比较低，渗透率小，储层能量低。

6·Generally quartz veins are not developed in measures with low rank coal.

低变质煤煤系石英脉一般不发育。

7·Primary factors influencing the exploration of coal - bed gas in low rank coal basins are analyzed.

分析了影响低阶煤盆地煤层气勘探的主控因素。

8·The results show that the CWS rheology of low rank or high ash coal is mainly due to the physical and chemical properties as well as surface structure characteristics of coal.

结果表明，低变质程度和高灰煤浆多呈屈服假塑性，煤的性质起主导作用；

9·The variation of medium pore diameter and porosity factor is in accordance with that of the pore volume, showing a high permeability of low rank coal reservoirs.

中值孔径、孔隙率的变化特征与孔容一致，预示了低煤级煤储层较高的基岩渗透率。

10·Compared with gymnospermae pollen, the fern spore has a more closer relationship with soluble organism in the low-rank source rocks from the coal-bearing strata.

而蕨类孢子和裸子植物花粉相比，可能对低熟-未熟油，特别是含非烃较高的低熟油有某种更为密切的联系。