页岩纳米级孔隙甲烷渗透特性模拟

Simulation of methane permeability in shale nano-pore

通过四参数随机增长法构造二维多孔介质模型,采用格子Boltzmann方法模拟甲烷在多孔介质中的流动,研究了多孔介质孔隙率(ε)、进出口压差和吸附解吸对于甲烷气体渗透率(K)的影响。实验结果表明,ε对K影响最明显,ε越大,K越大;K随进出口压差的增大而增大;而甲烷在固体表面吸附解吸对K的影响较小。

A two-dimensional porous media model was constructed by quartet structure generation set.The lattice Boltzmann method was used to simulate the flow of methane in these media.The effects of porous media porosity,pressure difference of inlet and outlet and adsorption and desorption on the permeability of methane gas were studied.The results show that the porosity has the most obvious influence on the permeability in shale.The larger the porosity,the greater the permeability.The permeability increases with the pressure difference.The adsorption and desorption of methane on solid surface have little effect on permeability.