<p>A large number of associated fractures develop along the strike-slip fault, which play a key role in hydrocarbon migration and storage. Using the Middle and Lower Ordovician carbonate reservoirs in the Shunnan Area as the study object, multi-scale fracture identification and characterization were carried out through core, conventional logging, Formation Micro-Scanner Image (FMI) logging data and thin section on 5 wells located in SB16 fault. The research results indicate that the lithology of the target formation in Shunnan Area is uniform, consisting of gray mud-crystal limestone. The target formation of the research area mainly develops tectonic fractures, with high angle shear fractures as the main type, with good aperture, partially filled with mud or calcite, and often visible with low-angle oblique fractures. The fracture length mainly ranges from 0 to 20&#xa0;cm, and the fracture aperture ranges from 0 to 5&#xa0;mm. There are three sets of fractures developed in the study area, with directions of NE-SW trending, NW-SE trending, and nearly EW trending. FMI logging fracture identification shows that low-angle oblique fractures are the most developed, accounting for 37.5%, followed by nearly vertical fractures, accounting for 32.4%. High-angle oblique fractures are less developed, accounting for 18.9%, while horizontal fractures are the least developed, accounting for only 11.2%. Conductivity fractures, resistance fractures, induced fractures, and suture lines are also identified. The fractured formations exhibit characteristics of low Young’s modulus and high Poisson’s ratio. In underdeveloped areas, fractures develop vertically at intervals, with a fracture line density 0 to 1 fractures per meter. In more developed areas, fractures are widely developed in the vertical direction, with a fracture line density 1 to 3 fractures per meter. Different segments of the strike-slip fault exhibit differential development of fractures.</p>