The reservoir space of fractured carbonate rock is various and complicated for the heavy nonhomogeneity caused by developing dissolution pores and caves. Conventional logging techniques have some limitation to evaluation of carbonate reservoirs, whereas FMI logging method has a unique advantage. On the base of core description such as space position, uniformity extent, and dissolution pore sizes on the core surface, and combining with FMI features, a fine FMI interpretation plate of reservoir type is set up, which can be applied to interpret non-core reservoirs. The research ones are from the pored/caved Triassic Feixianguan and Permian Changxing carbonate reservoirs in northeastern Sichuan Basin. These reservoirs can be divided into three types, i.e. the connective, the locally connective and the isolated ones. Using digital image processing technology, the area size of the dissolution pore sand caves in the image can be calculated and surface porosity can be obtained. The application of the FMI interpretation plate in cored wells validates that the FMI logging method is effective to evaluate nonhomogeneity of pored/caved carbonate reservoirs.