煤层总是产于一特定的岩石组合中。地质学家将这种组合的岩石，叫煤系地层。煤系地层除产有煤外，常常还含有许多共生、伴生矿产。这些矿产对国民经济同样具有重要意义。
文章摘要信息 关键词 ： 硫酸盐还原菌(SRB)；地下水；煤系地层 [gap=943]Keywords : sulfate-reducing bacteria(SRB)；groundwater；coal measure strata
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The sea area coal measure strata in Beizao coal mine is soft and cracked and the deformation of roadway is difficult to be controlled.
北皂煤矿海域煤系地层松软破碎，巷道变形难以控制。
参考来源 - 龙口海域软岩巷道围岩变形规律分析研究·2,447,543篇论文数据，部分数据来源于NoteExpress
兖州煤田的上侏罗统红层直接覆盖于二叠、石炭系煤系地层之上。
Upper Jurassic red bed cover directly on coal measure strata of Permian and Carboniferous system in Yanzhou coal field.
中生代晚期地温梯度高，是古生界碳酸盐岩及煤系地层的主要生气期和运移期。
The Late Mesozoic characterized by higher temperature gradient is main period of gas generation and migration of Paleozoic coal series and carbonates.
侏罗系煤系地层广泛分布于我国西北地区，低渗透砂岩储集层是其主要的储集层类型。
Jurassic coal-bearing formation scatters over the northwestern China. The low-permeability sandstone reservoir occurs as the main reservoir type.
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