Jurassic coal-bearing formation scatters over the northwestern China. The low-permeability sandstone reservoir occurs as the main reservoir type.
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。
Coal gas reservoir has different physical properties from sand and shale stone formation, it is difficult for conventional test to get formation parameters.
煤气储层具有与砂泥岩地层不同的储层物性，常规测试很难获取地层参数。
Effectual stress system, as the bridge of relating stratum energy and CBM reservoir formation, is formed by macroscopical dynamical energies which act on coal-bed.
有效压力系统是宏观动力能共同作用于煤储层而形成的压力体系，是联系煤储层地层能量与煤层气成藏的桥梁和纽带。
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