低抗压强度的软地层，如泥岩。石膏。盐岩。软页岩。软石灰岩。砂岩。
Low compressive strength of the soft formation, such as mudstone, gypsum, gypsum, soft shale, soft limestone, sandstone.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale, which is a soft rock and was obviously formed by being deposited on the sea bed.
桐柏吴城盆地五里堆组油页岩为棕黑色，质细而软，呈薄片状产出，平均含油率为6。
The oil shale of Wulidui Formation in the Wucheng Basin, Tongbai occurs as brown-black, thin and soft slices with an average oil yield up to 6.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale which is a soft rock and was obviously formed by being deposited on the sea bed.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale which is a soft rock and was obviously formed by being deposited on the sea bed.
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