页岩气储层微尺度流动模型研究及应用

Research and Application of Microscopic Scale Flow Model in Shale Gas Reservoir

利用尘气模型对页岩气储层纳米级孔喉中的努森扩散和气体分子扩散的扩散系数进行校正。通过尘气模型对二元气体的Knudsen扩散和气体分子扩散进行耦合模拟,表征气体的组分状态变化,获得储层岩心渗透率估值。通过持续测量气体组分的变化确定其有效流动边界,为页岩气的生产诊断、建模和储量估算提供理论依据和数据支持。

Diffusivity of both Knudsen diffusion and molecular diffusion in nanometer scale pore throat were corrected by dusty- gas model in shale gas reservoir. Coupling simulation of Knudsen diffusion and molecular diffusion were conducted with dusty- gas model in order to examine the change of flowing gas composition and achieve reservoir core permeability estimation at the low permeability reservoir. By continously measuring the change of gas composition,the flow boundaries of the shale gas reservoir can be identified and estimated.