毕竟煤炭矿床本身就是石化的泥炭沼泽，而泥炭的成份是腐烂的植物。当粘土泥浆逐渐硬化成页岩石，腐烂的植物则在上面留下了它们的印记。
Coal deposits, after all, are petrified peat swamps, and peat is made from decaying plants, which leave their imprints in mud and clay as it hardens into shale stone.
因此粘土和页岩就往往不透水。
通过防止泥页岩水化膨胀的粘土稳定性能研究，讨论了它们的分子结构对抑制性的影响。
The effect of molecular structure of polymer to anti-swell ability are studied by analysing clay stabilization capabilities investigated.
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