Volcanic rock or carbonate reservoir has strong heterogeneity, and the fracture-cave porosity obtained by traditional porosity logging has large error. FMI has the advantages of continuity, azi-muthally,intuitive and high resolution,therefore, we combined FMI logging with conventional logging data to carry out fractured reservoir evaluation. The method includes two steps,firstly,the FMI resistivity data which has been calibrated by shallow lateral log is transformed into porosity-frequency distribution curve; secondly, OTSU method is used to identify the cut-off value of matrix and fracture-cave porosity to calculate the two porosities. Actual processing result was compared with FMI figure and the porosity. The result indicates that the method has high interpretation accuracy and is feasible.%对于非均质性较高的火山岩或碳酸盐岩储集层,利用传统的孔隙度测井方法求取的缝洞孔隙度误差较高.为此,借助FMI测井资料具有的连续性、方位性、直观性和高分辨率优势,结合常规测井资料进行裂缝性储层评价.该方法包括两个步骤:首先将浅侧向刻度过的FMI电阻率数据转化为孔隙度频率分布曲线；然后选择某一孔隙度值作为基质与缝洞孔隙度的分界点,进而求出基质孔隙度及缝洞孔隙度.将实际资料处理结果与FMI图像及孔隙度数值进行了对比,结果表明,该方法解释精度较高,切实可行.
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