Through researching on coal - bearing stratum in Shuanghua coal field, the usual coal formation rules are reviewed.

通过对双桦煤田含煤地层的研究,总结出了双桦煤田的一般成煤规律.

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Coal - bearing strata in the Wangguanzhuang exploration area belongs to Permo - Carboniferous North China type coal - bearing formation.

王官庄探区含煤岩系为石炭—二叠系,属华北型含煤建造,煤系厚度稳定,旋回结构与粒度韵律清晰,且变化有一定规律.

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It's very important for coal mining to find out small geological structure in coal bearing formation.

查清煤系地层中的小构造对于煤矿开采十分重要.

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Coal geology emphatically studies always stratigraphy and sedimentology of coal and coal - bearing strata.

煤地质学一直偏重于对煤和含煤地层的地层学和沉积学的研究.

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