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Narr和Lerche（1984）提出的地下天然裂缝间距指数估测方法存在一定局限性，不能估测较大的裂缝间距指数；且由于它未考虑岩心中观察到的裂缝数对裂缝间距指数的影响，亦未考虑岩层厚度与裂缝数的关系，因而估测的准确度不高。针对该方法的缺陷，提出在岩心直径、钻孔与岩层夹角、裂缝侧伏角为已知时，根据岩层厚度和各层在岩心中所含有裂缝数估测裂缝间距指数。新方法适用范围更广，即使只有单个钻孔资料，也可以获得较准确的估测结集。
Narr and Lerche (1984) proposed a method to estimate the natural fracture spacing index of underground, which can not estimate the larger fracture spacing index. Because it does not consider the influence of the fracture number observed in the core on the fracture spacing index, The relationship between the thickness of the rock and the number of fractures is also not taken into consideration, so the accuracy of the estimation is not high. In view of the defects of the method, the crack spacing index is proposed based on the thickness of the rock and the number of cracks in each core in the core when the core diameter, the angle between borehole and rock formation and the side volute angle at fracture are known. The new method is more broadly applicable and can obtain more accurate estimates even with only single borehole data.