Shale oil in the Sichuan Basin is widely distributed with numerous vertical layers and abundant resources. Currently, the focus of exploration is on the intercalated sandstone of Liangshan Formation 2, which is characterized by high porosity (6.4%) and high oil saturation (65%), but has a thin reservoir thickness (6–10 m). The lateral distribution of the channel varies greatly (width 110 ~ 230 m), and low-angle fractures develop in the sand body. Due to the high quartz content (> 90%) and strong abrasiveness of the high-quality sand body, most solid drilling hole tracks are located outside the box, making it difficult to fully cover hydraulic fractures. This study utilizes large physical model experiments and discrete element numerical simulations of fracture propagation to demonstrate that achieving full longitudinal transformation of the intercalated sandstone of Liang Formation’s second member requires high viscosity (60 MPa s) + directional perforation. Integrated geological engineering design using a petroleum platform optimizes fracture segmentation and distribution as well as liquid strength and proppant addition strength, resulting in accurate reconstruction of narrow channels and thin reservoirs. This approach has yielded promising results in well G119H, producing 20 m3/d, marking a significant breakthrough in tight oil extraction within this basin.