Finite element numerical simulation for dispersion and attenuation of elastic parameters in fractured porous reservoirs
The frequency-varying properties of elastic parameters of fluid-saturated fractured porous reservoir media are often applied in seismic exploration and reservoir evaluation.Due to the inaccuracy and lack of precision of the traditional effective medium theory,this study derives the Biot consolidation equation applicable to poroelastic reservoirs and develops a corresponding finite element numerical simulation for calculating the dispersion and attenuation of seismic wave velocity induced by the wave-induced flow,and studying the mechanism of the influence of parameters such as permeability of the model medium,fluid type and viscosity on the frequency-varying elastic parameters.The simulation results show that:1)In comparison with existing theoretical petrophysical models,this numerical simulation method is more suitable for simulate 1D/2D fractured porous media in a wide band;2)The permeability,fluid viscosity,and fluid saturation mode,which are the important physical parameters of the core,significantly affect the elastic response of seismic wave.The characteristic frequency shifts to the right if permeability increases,and the characteristic frequency shifts to the left if viscosity increases.The gas-in-water model has a larger attenuation peak and slightly higher eigenfrequency than the gas-in-oil model.In summary,this study provides an accurate prediction method for the further understanding of the propagation characteristics of seismic waves in fractured porous reservoirs,which helps to reveal the nonhomogeneity and pore structure of reservoirs,improve the exploration accuracy and reliability of reservoir evaluation,and has important guiding significance for the petrophysical interpretation of reservoir prediction and fluid identification.
dispersion and attenuationfractured porous medianumerical simulationrock physicsfluid flow
万方数据
维普
