To clearly understand the initiation and reorientation of hydraulically-induced fractures during hydraulic fracturing in shale gas reservoirs, a fluid-solid coupling 2D model for simulating propagation and reorientation of hydraulically-induced fractures is established with the extended finite element method (XFEM). And the effects of factors such as perforation azimuth angle, injection rate of fracturing fluid and difference between horizontal stresses on fracture initiation and reorientation during hydraulic fracturing in shale gas reservoirs are analyzed. The results show that both the initiation pressure and reorientation radius of hydraulically-induced fracture will increase with the increase of the perforation azimuth angle, which is not conducive to the formation of straight fractures with better fracturing reconstruction. In addition, when a large injection rate of the fracturing fluid is designed during fracturing operation, the initiation pressure of hydraulically-induced fracture will be higher and its reorientation radius will be larger, which leads to better fracturing reconstruction effect. Finally, for reservoirs with large difference large difference between two horizontal principal stresses, initiation pressure will be lower and fracture turning will be more significant. The above investigation results fully reveal the influence of different factors on fracture initiation and fracture reorientation during fracturing operation, which can provide theoretical support for practical fracturing design in shale gas reservoirs. [ABSTRACT FROM AUTHOR]