Inversion of reservoir parameters based on the BISQ model in partially saturated porous media

The Biot-flow mechanism and the squirt-flow mechanism are the two most important mechanisms of pore fluids in a fluid-saturated porous medium. Based on the BISQ model including the two mechanisms simultaneously, we perform the inversion of reservoir parameters (e. g., porosity, permeability, and saturation) by using the Niche genetic algorithms (NGA). Numerical experiments indicate that during the process of reservoir parametric inversion the convergence of objective function is speedy, and our algorithms have the property of strongly protecting noises of observations. The results of reservoir parametric inversion are very precise while the errors of observation are less than 5%. Finally, applying to the practical inversion of experimental data proves that our algorithms are effective for the inverse problems of wave propagation in partially saturated reservoir media affected simultaneously by the Biot and squirt-flow mechanisms.