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压实作用强烈是北山地区侏罗系煤系砂岩最具特色的成岩现象，也是使孔隙减少的最主要因素。远离煤层的粗碎屑岩以广泛的方解石胶结和交代为特征，而与煤层共生的细碎屑岩则表现出强烈的压实作用。这种差别与原始沉积环境和构造位置有关，决定于煤层的存在、演化以及压实内循环流体。压实作用使煤系砂岩的孔隙度和渗透率均偏低，但以溶解作用为主的过渡带压实和胶结适中，物性最佳，具最好的生储配置。
Compaction is strongly characterized by the most characteristic diagenesis of the Jurassic coal measures sandstone in the Beishan area and the most important factor in reducing porosity. The coarse clastic rocks away from the coal seam are characterized by a wide range of calcite cementation and metasomatism, while the fine clastic rocks symbiotic with the coal seams show strong compaction. This difference is related to the original depositional environment and tectonic setting, and is determined by the existence and evolution of the coal seam and the compaction of the circulating fluid. The compaction results in low porosity and permeability of the coal-bearing sandstones. However, the transitional zone dominated by dissolution is moderately compacted and has the best physical properties and the best reservoir configuration.