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岩心钻进中所指的复杂地层主要是根据钻进中遇到的一些困难问题而提出来的。如钻进中孔内有掉块、活石、坍塌、缩径、超径、漏水、涌水和钙镁离子污染等现象，需要采取适当护孔措施才能保持正常钻进的地层统称为复杂地层。一、影响复杂地层的主要因素影响复杂地层的因素是多方面的，主要可以从两个方面考虑：一是地层特征，二是钻进工艺，这两方面因素相互制约，密切相关。它们之间的相适应性又直接影响复杂地层发生变化。
The complex formation referred to in core drilling is mainly based on some difficult problems encountered during drilling. Such as drilling into the hole hole, live rock, collapse, diameter reduction, over diameter, water leakage, water and calcium and magnesium ions pollution and other phenomena, need to take appropriate measures to protect the hole to maintain normal drilling collectively referred to as complex formations. First, the main factors affecting complex formation Affecting complex formation factors are many, mainly from two aspects: First, the formation characteristics, and second, drilling technology, the two factors are closely related to each other. The adaptability between them directly affects the changes of complex formations.