Alternating sandstones and shales are regarded as important.
蚀变的砂岩和页岩是很重要的。
Pteria Contorta shales
含瓣鳃类页岩
Sandstones are, as a rule, interbedded with shales.
砂岩通常都与页岩互层。
Thus clays and shales tend to be impermeable.
因此粘土和页岩就往往不透水。
Uranium is frequently enriched by sorption or chemical combination in shales, lignites and phosphorites.
铀经常为页岩，泥炭和磷块岩所吸附或化学结合态而富集。
The Jiabula Formation consists of a group of black shales with intercalations of sandstone and sandy limestone.
以及甲不拉组黑色页岩、硅质泥页岩夹砂岩和砂质灰岩。
Phenolic sand consolidation Sandstones are, as a rule, interbedded with shales.
酚醛树脂地层砂胶结砂岩通常都与页岩互层。
These cyclic sequences are overlain by the lagoon dolomitic mudstones and shales.
米级旋回层序之顶覆以厚度不等得?
If shales prover nonreactive, allow Lime content to deplete.
如果证实页岩没有反应, 就允许把钻井液中所含的石灰耗尽。
Test Method for Slake Durability of Shales and Similar Weak Rocks
油页岩和类似软岩石潮解耐久性的试验方法
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