塔河油田主要为碳酸盐岩储层，裂隙、缝洞发育，影响常规测井数据的获取和准确性。当不能获得常规测井数据时，可由 PND 测井的俘获截面 SIGMA 解释储层孔隙度。根据 CATO 与饱和度和孔隙度的关系，对 SIGMA 进行了饱和度校正。计算的孔隙度与 CNL 有更好的一致性，相关系数高达 0. 91，证明了 SIGMA 与 CATO 联合计算孔隙度方法的有效性，为碳酸盐岩储层裂隙、缝洞发育时的孔隙度解释提供了一种行之有效的方法。

The cracks and fracture- caves are very developed in Tahe oilfield composed mainly of carbonate reservoir，which affects the acquisition and accuracy of conventional logging data． When the conventional logging data can not be obtained，capture cross section of PND can be used to explain the porosity of reservoir． According to the relationship among CATO，saturation and porosity，the authors proceed the saturation correction of SIGMA． The results of porosity calculation is better consistent with of CNL，showing 0. 91 in correlation coefficient，which proved the efficiency of porosity calculation by SIGMA with CATO，and provided a new method of porosity inter- pretation when cracks and fracture- caves developed in carbonate reservoirs．