In order to solve the problems of poor detection effect of conventional seismic data interpretation on small and medium-scale faults and insufficient evaluation of reservoir fault effectiveness, a reservoir fracture prediction and effectiveness evaluation method combining the fault connectivity evaluation method and the fault opening evaluation method based on curvature attribute was proposed. This method was applied to the WY Longmaxi Formation shale reservoir working area. Gradient Structure Tensor(GST)curvature and energy ratio coherence attributes were used to identify major fracture development zones, highlighting small-and medium-scale fractures, thus providing a clearer and more comprehensive characterization of fracture features in the target reservoir. Using the fracture openness prediction method based on maximum positive curvature and the curvature along strike attributes, orientation strength attributes for six different directions (0°, 30°, 60°, -30°, -60°, -90°) were calculated to accurately evaluate fracture openness and emphasize open fractures. Combined with the fracture connectivity prediction method based on the three-dimensional steady-state saturated fluid equation, absolute flow values were used to highlight connected fractures, allowing for a comprehensive evaluation of effective fracture development zones. The results indicate that numerous small-and medium-scale fractures developed in the reservoir. The openness and connectivity of effective fractures are both high, mainly concentrated in the central, southwestern, and northeastern parts of the reservoir, with orientations trending northwest-southeast, north-south, and northeast-southwest.