Advanced understanding of gas flow and the Klinkenberg effect in nanoporous rocks

Gas flow in nanoporous rocks is closely relevant to several globally important energy and environmental issues, such as shale-gas production CO2 subsurface sequestration. The Klinkenberg effect critical an understanding of gas flow, yet many specifics are unclear for rocks. Here we investigated the on basis a systematic study permeability diffusivity under range pore pressures varying water saturations. We invalidated use equation determination intrinsic slippage factor measurements current laboratory conditions propose modified more reliable factor. show that relative higher at lower saturations than ones. underlying mechanism increased size after saturation was elucidated through neutron imaging distribution. In addition, demonstrate better characterizes diffusive can be either dry or partly saturated conditions. Finally, characteristic pore-diameter index derived new form porosity–permeability relationship found have good correlation, which previously lacking, with Collectively, these insights advance will implications industrial applications.