Simulation And Inversion Of Wave Equation In Fluid Porous Media

The fluid porous media is closer to reality and more obviously reflects the relation of seismic information and rock mechanical property than one phase media. So the forward problem, wave field character and inversion problem of fluid porous media are important in these theory and application.Firstly, we have researched the theory of wave equation in fluid porous media in this paper, and the transformation relationship of wave equation and Gassmann equation has been derivated.Then, pseudo-spectral method has been used to the wavefield simulation of fluid porous media through wave equation. The numerical simulation compared different mechanism, for example surface seismic, crosshole seismic and vertical seismic profiling. The influence of dissipation constant, porosity and different fluid in fluid porous media wavefield absorption and attenuation has been analyzed. The knowledge and the conclusions show the complexity of the fluid porous media wave field character.Finally, the unite nonlinearity method of genetic algorithm has been used to inverse two parameters of fluid porous medium. Then, the inversion results of different initial model are slightly distinction, but at the same time the results indicate that genetic algorithm is high precision, high antinoise and practicability.