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。
The low reservoir permeability is mainly caused by destroyed fracture system, producing and increasing fragmented coal and mylonitic coal.
碎粒煤和糜棱煤的不断产生与增加及对裂隙系统的严重破坏是煤储层低渗透性主要影响因素；
Shanle Oilfield is the especially low permeability oil reservoir of coal measure interlay in Tuha oil region, with particular geologic condition and complicated structure.
鄯勒油田是吐哈油区的一个特低渗煤系互层油藏，地质条件特殊，构造复杂。
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