Recently，breakthroughs have been made in the exploration and development of Jurassic lacustrine shale oil reservoirs in the central Sichuan Basin，whereas the overall output of shale oil wells is not enough to meet the requirements of commercial development.After the fracturing of shale oil wells，shut-in are generally adopted to use fracturing fluid to imbibe and displace crude oil in the formation. However，the range of imbibition and the key influencing factors of fracturing fluid into shale matrix pores during the shut-in period are still unclear. In this paper，a model of shale matrix fluid imbibition and invasion depth was built，which took into account fracturing fluid residue clogging，positive hydraulic pressure difference，capillary force，and flow pressure. The model was verified by the monitoring data of core NMR stratified T2 spectrum，and the average error is 14.17%. Example analysis shows that within 90 days of shut-in，the imbibition range of fracturing fluid into matrix pores is less than 0.72 m. Surface wetting modification（hydrophobic to hydrophilic）effectively improves the imbibition range of fracturing fluid，while the influence of oil-water interfacial tension is relatively weak. According to the relation curve between shut-in time and imbibition invasion depth，the recom‐mended shut-in time is about 40-50 days.