The G oil layer at the outer edge of the Songnan Qingzijing belongs to the thin interbedded sedimentation of sand, mud and shale at the outer edge of the continental delta, which belongs to the more realistic successor resources of the oilfield. In view of the problems of thin sandstone reservoirs, deep overall burial depth, inoperable vertical wells, and the need for horizontal wells to achieve benefit development, this study focuses on ensuring the drilling rate of horizontal wells and guiding engineering fracturing, carries out comprehensive seismic technology research, and forms a comprehensive geophysical prospecting technology for horizontal wells in unconventional reservoirs, that is, on the basis of fine implementation of structure and reservoir, the application of depth domain seismic three-dimensional horizontal well trajectory design, guidance while drilling technology and engineering sweet point parameter prediction to guide the deployment, drilling, and optimization of fracturing design of horizontal wells. In the actual production, it effectively supported the large-scale deployment and drilling of 50 horizontal wells, as well as the fracturing guidance and production of 15 horizontal wells, with an average drilling rate of more than 80%, a good single well production, and the effective utilization of unconventional resources.