The effect of Knudsen diffusion and adsorption on shale transport in nanopores

Jie Chen, Jiangyong Hou, Rui Wang, Yongchang Hui*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Shale transport properties are investigated by numerical simulations of a simple, physics-based continuum model. Shale samples from the Yanchang Triassic Formation in Ordos Basin are tested to get the pore volume distribution of shale. Due to the existence of nanopores in shale reservoirs, there are great differences in gas transport mechanisms compared to those in conventional gas reservoirs. These mechanisms include Knudsen diffusion and adsorption. A physics-based continuum model is utilized to simulate the gas transport in a channel with nanoscale radius, where these mechanisms are taken into consideration by imposing a general boundary condition with two parameters. The correction factor which is the ratio between apparent permeability and intrinsic permeability is investigated for a wide pressure range, which shows it is always larger than 1, illustrating that Knudsen diffusion always plays a role in shale gas transport.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalAdvances in Mechanical Engineering
Issue number9
Publication statusPublished - 1 Sept 2017
Externally publishedYes


  • Knudsen diffusion
  • Shale reservoirs
  • adsorption
  • slip boundary conditions


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