煤级，又称煤阶。煤化作用深浅程度的等级，也用以表示煤变质程度。
据此分类对我国高煤级煤孔隙性质的分布及演化规律进行了探讨。
On the basis of the classification, the evolution and distribution of properties of pore of the high rank coal in China were discussed.
煤基块弹性能随着煤储层埋深的增加而降低，随着煤级的升高而增大。
Coal matrix flexibility energy decreased with the increasing of buried deepness of coal reservoir, and increased with the rising of coal rank.
鉴于高煤级煤储层物性的特殊性，指出了高煤级煤储层煤层气开发的技术和措施。
Techniques and measures are suggested for developing CBM in high-rank coal reservoirs aiming at the particularity of physical properties of high-rank coal reservoirs.
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