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Pore structural evolution of shale following thermochemical treatment

Rigby, Sean P.; Jahan, Hosne; Stevens, Lee; Uguna, Clement; Snape, Colin; Macnaughton, Bill; Large, David J.; Fletcher, Robin S.


Professor of Chemical Engineering

Hosne Jahan

Senior Research Fellow

Professor of Chemical Technology & Chemical Eng

Bill Macnaughton

Abbott Professor of Geoscience

Robin S. Fletcher


Shales experience heat treatment concurrent with the presence of water or steam during reservoir engineering interventions, such as high pressure water fracking and in-situ combustion of hydrocarbons. This work utilises a novel technique, which is a combination of gas sorption overcondensation and integrated mercury porosimetry experiments, not used before for any type of porous material, to study the pore structure of a shale rock, and its evolution following thermal treatment in the presence of water. Overcondensation allows the extension of gas sorption beyond the limits of conventional experiments to enable direct study of macroporosity. Scanning curve experiments, initiated from the complete boundary desorption isotherm, that can only be obtained for macropores by overcondensation experiments, has revealed details of the relative pore size spatial disposition within the network. In particular, it has been found that the new large voids formed by treatment are shielded by relatively much narrower pore windows. Use of a range of different adsorbates, with differing polarity, has allowed the chemical nature of the pore surface before and after treatment to be probed. Integrated rate of gas sorption and mercury porosimetry experiments have determined the level of the particular contribution to mass transport rates of the newly introduced porosity generated by thermal treatment. Combined CXT and mercury porosimetry have allowed the mapping of the macroscopic spatial distribution of even the new mesoporosity, and revealed the degree of pervasiveness of the new voids that leads to a thousand-fold increase in mass transport on thermal treatment.


Rigby, S. P., Jahan, H., Stevens, L., Uguna, C., Snape, C., Macnaughton, B., …Fletcher, R. S. (2020). Pore structural evolution of shale following thermochemical treatment. Marine and Petroleum Geology, 112,

Journal Article Type Article
Acceptance Date Sep 23, 2019
Online Publication Date Sep 26, 2019
Publication Date 2020-02
Deposit Date Oct 15, 2019
Publicly Available Date Sep 27, 2020
Journal Marine and Petroleum Geology
Print ISSN 0264-8172
Electronic ISSN 1873-4073
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 112
Article Number 104058
Keywords Shale; Pyrolysis; In-situ combustion; Pore network; Gas sorption; Mercury porosimetry; X-ray tomography
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