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.
软地层、粘地层、膨胀性粘土地层的总称术语，通常在海洋钻井时的表层钻遇，或者在近海陆地钻井时的沉积盆地时钻遇。
A generic term for soft, sticky, swelling clay formations that are frequently encountered in surface holes offshore or in sedimentary basins onshore near seas.
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.
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