古代植物在古气候、古地理和古构造等有利条件下，聚集而形成煤矿床（最初为泥炭）的作用。 强烈的地壳活动使有利聚煤沼泽的环境不易长期保持，过于缓慢的地壳活动又因堆积的植物遗体暴露在水面以上，受风化而被破坏掉。因此只有地壳的沉降速度与植物遗体堆积长期保持平衡的情况下，植物遗体才能够大量堆积并保存下来，形成一定厚度的泥炭层。
聚煤作用发生在特定的演化阶段。
The coal accumulation process took place during their certain periods.
煤层和富煤带的形成是聚煤作用因素系统作用的结果。
The coalbed and coal - rich zone was an effects which the factor of coal accumulation process systematic action.
SQ2层序由于构造变动频繁，加以后期剥蚀严重，导致聚煤作用逐渐减弱。
SQ2 sequence due to frequent changes in structure, and because the later strongly denudation, leading to coal accumulation gradually weakened.
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