Abstract: Because of extremely serious heterogeneity and anisotropy,great limitations occur for just applying conventional well logging techniques in Lower Ordovician carbonate reservoir with fractures and caverns in Tahe oilfield. In view of the recent year oilfield application of FMI well log in drilling of Tahe oifield, the results showed that this technique has an important value for use in reservoir identification log response calibration from conventional logging and fracture-cavity reservoir logging, modern ground stress analysis and karst zone classification.

Key words: Tarim basin, Tahe oilfield, FMI imaging logging, conventional well log, reservoir recognition, karst zone classification