Water and Gas front Prediction in Sandstone Reservoirs with a Novel Geophysical Method

According to the 4D seismic, a lot of information about reservoir conditions during production can be determined. The received response during seismic operation is different regarding to the reservoir conditions, for instance factors affecting on fluid saturation conditions within porous media. Moreover the amount of this saturation changes by fluid that has been injected through the reservoir for enhanced oil recovery (EOR). These changes can be determined by appropriate seismic attributes from received waves, which are magnitude, energy ratio, phase, and the ratio of compressional to shear wave velocity. The aim of this paper is to investigate these changes and finding the best wavesʹ attributes for each injected fluids within the reservoir to find the location of water or gas front in reservoirs. After testing this method on synthetic data the best attributes determined, which is the ratio of compressional to shear wave velocity