To improve the understanding of gas transport processes in tight rocks (e.g., shales), systematic flow tests with different gases were conducted on artificial micro- to nanoporous analogue materials. Due to the rigidity of these systems, fluid-dynamic effects could be studied at elevated pressures without interference of poro-elastic effects. Flow tests with narrow capillaries did not reveal any viscosity anomaly in a confined space down to capillary diameters of 2 µm. Experiments with nanoporous ceramic disks (> 99% Al₂O₃) conducted at confining pressures from 10 to 50 MPa did not indicate any stress dependence of permeability coefficients. Analysis of the apparent permeability coefficients over a mean gas pressure range from 0.2 to 30.5 MPa showed essentially linear Klinkenberg trends with no indication of second-order slip flow. The Klinkenberg-corrected permeability coefficients measured with helium were consistently higher than those measured with all other gases under the same conditions. This “helium anomaly” was, however, less pronounced than the same effect observed in natural rocks, indicating that it is probably not related to fluid-dynamic effects but rather to gas–solid interactions (e.g., sorption). Permeability tests with CO₂ on the nanoporous membrane show significant deviations from the linear Klinkenberg trend around the critical point. This is due to the drastic changes of the thermodynamic properties, in particular the isothermal compressibility, in this pressure and temperature range. Helium pycnometry, mercury intrusion porosimetry and low-pressure nitrogen sorption showed good agreement in terms of porosity (~ 28%) and the most prominent pore diameter (~ 68.5 nm).

为了增进对致密岩石（例如页岩）中气体传输过程的了解，在人造微孔至纳米孔模拟材料上进行了不同气体的系统流动测试。由于这些系统的刚性，可以在高压下研究流体动力效应而不会影响孔隙弹性效应。在狭窄的毛细管中进行的流动测试没有发现在毛细管直径为2 µm的密闭空间中的任何粘度异常。纳米多孔陶瓷盘（> 99％Al ₂ O ₃）在10至50 MPa的围压下进行）并未显示出渗透系数的任何应力依赖性。在0.2至30.5 MPa的平均气压范围内，视在渗透系数的分析显示出基本线性的Klinkenberg趋势，没有迹象表明存在二次滑流。在相同条件下，用氦气测得的经克林肯贝格校正的渗透系数始终高于用其他所有气体测得的渗透系数。但是，这种“氦异常”的影响不如在天然岩石中观察到的相同，表明它可能与流体动力学效应无关，而与气固相互作用（例如吸附）有关。CO _2的渗透性测试纳米多孔膜上的临界点附近的线性Klinkenberg趋势显示出显着偏离。这是由于在该压力和温度范围内热力学性质，特别是等温可压缩性的急剧变化。氦比重法，压汞法和低压氮吸附法在孔隙率（〜28％）和最突出的孔径（〜68.5nm）方面显示出良好的一致性。