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An Investigation of Gas-transport Properties of COx Argillite During the Drying/Wetting Paths
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An Investigation of Gas-transport Properties of COx Argillite During the Drying/Wetting Paths
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Journal Article
An Investigation of Gas-transport Properties of COx Argillite During the Drying/Wetting Paths
2025
Overview
We report laboratory experiments to investigate the evolution of gas-transport properties of COx argillite along drying and wetting paths, in the context of deep underground nuclear waste disposal. The gas injection technique was used to simultaneously measure the variations of gas accessible porosity (
ϕ
ag
) and gas permeability (
K
g
) under different confining pressures (
P
c
) and relative humidity (RH). Our results show that porosity (dry samples) and water saturation measured or derived by the gas injection technique are in good agreement with the conventional water vapor equilibration method, which confirms the quality and efficiency of the technique. Furthermore, the different changing magnitudes of
ϕ
ag
and
K
g
measured in the wetting and drying paths are attributed to the fact that the swelling deformation is greater than the shrinkage deformation. A coupling effect is observed between
P
c
and RH. Specifically, when the sample is in a dry (or quasi-dry) state, relative gas accessible porosity
ϕ
rag
does not (or negligibly) vary with
P
c
, whereas the relative gas permeability (
K
rg
) shows a strong sensitivity to
P
c
. This is due to crack closure, which increases the tortuosity of the pores and/or causes part of the pores to be “crack closing”. However, in the highly saturated case, both
ϕ
rag
and
K
rg
become more and more sensitive to
P
c
. This is caused not only by the crack closing but also by the softening of the material and the redistribution of saturation.
Highlights
This work aims to study the gas-transport properties of COx argillite during the drying and wetting paths.
The gas injection technique was used to measure accessible gas porosity and effective gas permeability under different confining pressures and relative humidity.
The porosity (dry samples) and water saturation derived by the gas injection technique are in good agreement with the conventional water vapor equilibration method.
A coupling effect was observed between confining pressures and relative humidity.
