Sand lens and structuralˉlithologic reservoirs are the main types of lithologic reservoirs for growth of reserves and production in the Shengtuo area of the Dongying Depression. We conduct a physical simulation on its accumulation characteristics，and the results show that significant conditions which determine the forming of lithologic reservoirs are sufficient and effective gas sources，charging patterns，changes of physical properties of sand lens，and the relative positions of faults connecting reservoirs with source rocks to sand bodies. Among these conditions，faults connecting effective source rocks and reservoirs are critical to the forming of lithologic oil/gas reservoirs，and the changes of physical properties of sand bodies and the relative positions of faults to sand bodies are the main controlling factors of oil saturation. According to this study，the next exploration targets in this area should be the center of sand lens and the sand bodies in the upper wall of structuralˉlithologic oil/gas reservoirs.