A generic term for soft, sticky, swelling clay formations that are frequently encountered in surface holes offshore or in sedimentary basins onshore near seas.
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。
Both clay and sandstone are unstable rock formations.
黏土和砂岩都是不坚固的岩石构造。
Rock formations with a high clay content also may tend to be washed away by water.
粘土含量高的岩层也容易被水冲刷掉。
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