Abstract:Studying the feasibility of time-lapse seismic prospecting is important to effectively carry out the seismic reservoir monitoring.In accordance with the feature of geological conditions and long-period water drive in the east oilfields of China and based on Kuster-Toksoz petrophysical model and Biot wave theory in fluid-saturated porous medium,the paper discussed the conditions implementing seismic monitoring in the east long-period water-drive reservoirs from such aspects as reservoir thickness,porosity and seismic data quality etc.The studied results showed that it needs meet the following conditions for conducting seismic monitoring in the east of China:① the thickness of reser-voir should be greater than one-twelfth of seismic wavelength;②the porosity is greater than 20%;③ the lateral stretched scope of reservoir is greater than one-fifth of radius of Fresnel zone and spatial sampling interval is small enough;④ the reservoirs should be high-velocity and low-velodty reservoirs (in relation to surrounding beds);⑤the S/N ratio of seismic data should be above 2;⑥ the errors of nonrepeatability of seismic data should be less than 20%.