Core recovery of deep broken limestone formation is very low due to the influence of its lithology, formation dip and tectonic earth stress.

• 深井灰岩破碎地层取心效果受地层岩性、地层倾角以及构造地应力对地层的挤压作用等因素影响较大,采用常规取心工具收获率低(邻井当深3井取心收获率仅有23%25)。