Abstract: The effectiveness of fracture largely depends on fracture apertures and radial extension. Formation microresistivity image logging can effectively identify the fracture, but it can not judge radial extension. Using formation micro-resistivity imaging logging with ARI logging can determine the effectiveness of fracture. In the absence of advanced logging technology, the use of differences of dual lateral logging can also be used to determine the effectiveness of fractures. For the carbonate rock reservoir with the complex pore structure, layered strata, isolated cavity strata, conventional logs response characteristics alone will often lead to the wrong interpretation. Conclusions must be based on reservoir geological characteristics to make an reasonable assessment of reservoir effectiveness.

Key words: reservoir effectiveness, image logging, dual lateral logging, pore structure, layered strata, isolated cavity