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。
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；
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。
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