Investigation of Fluid Movement Effect on Seismic TWT in Carbonate Reservoirs

4D seismic has evolved from a qualitative tool to identify producing zones and bypassed oil, to become an integral part of quantitative reservoir management. Therefore, the 4D seismic is commonly expensive, feasibility study must be done on each region and/or field to examine whether the rock properties and fluid parameters let using seismic methods for reservoir monitoring or not. In this study which is done on a part of carbonate formation in southern Iran, using Kuster-Toksoz equations and Gassmannʹs, seismic parameters variations due to changing fluid saturation in a well of carbonate oil reservoir, are calculated. Then by using of Aki-Richard equation, synthetic seismograms for before and after oil production are generated. Consequently, time lapse seismic method could be accomplished on this oil field.