The forward modeling result of waterflood seismic monitoring of Pu 1 group sandstone reservoir in Daqing Oilfields shows that different reservoirs have different demands for visual resolution and visual signal to noise ratio of seismic data used in reservoir monitoring.Comparing with thick reservoirs of the same lithological property

thin reservoirs and thin interbedded reservoirs demand higher visual resolution and visual signal to noise ratio.Monitoring fluid performance variation of each bed in thin interbedded reservoirs must improve the resolution and the visual S/N ratio of different seismic profile.The product of the visual resolution an isual S/N ratio can be used in the feasible quantitative analysis of time lapse seismonitoring.