Summary Effective pressure effect on porous reservoir formation is one of the most important factors contributing to time-lapse seismic attribute changes. Our research shows that the existing commonly used models tend to overestimate effective pressure effect at high effective pressure, which might cause significant misinterpretation of 4D seismic data. Based on analysis of a large quantity of lab data, a new model that is simpler and has clearer physical meaning was brought up in this study. This new model should be sufficient to describe the effective pressure effect on various porous reservoir rocks
