4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look

Y. Ji; C.J. Spiers; S.J.T. Hangx; J.H.P. de Bresser; M.R. Drury

doi:10.1201/9781003295808-9

4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

Abstract

Rock salt formations represent key options for storage of natural gas, hydrogen,
and compressed air energy, and for storage or disposal of radioactive waste. At depths beyond
a few tens or hundreds of meters, undisturbed halite-dominated (>90%) rock salt deposits are
usually impermeable and have very low porosity. However, as a result of excavation, nearfield microcracking and associated dilatancy occur in rock salt, increasing porosity and
permeability. The connectivity of a brine- or water-vapour-filled microcrack network in
deformation-damaged salt, is expected to decrease over time, partly due to dissolutionprecipitation healing. Here, we employ 4D (i.e., time-resolved 3D) microtomography to study
the long-term evolution of dilated grain boundary and microcrack networks developed in
deformation-damaged natural salt by such brine-assisted processes. We found substantial
microstructural modification or “healing” over periods of days to a few months. Cracks and
dilated grain boundaries became crystallographically faceted, necked, discontinuous, and
disconnected, and often migrated to “recrystallize” the material, producing an increase in
tortuosity and a decrease in connectivity of the crack network. The magnitude and rate of
associated permeability reduction and its evolution with time remain to be determined in future
studies.

Original language	English
Title of host publication	The Mechanical Behavior of Salt X
Subtitle of host publication	Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022
Editors	J.H.P. de Bresser, M.R. Drury, P. A. Fokker, M. Gazzani, S.J.T. Hangx, A.R. Niemeijer, C.J. Spiers
Place of Publication	London
Publisher	CRC Press
Pages	88-97
Number of pages	10
Edition	1
ISBN (Electronic)	9781003295808
ISBN (Print)	9781032282206
DOIs	https://doi.org/10.1201/9781003295808-9
Publication status	Published - 5 Jul 2022
Event	10th Conference on the Mechanical Behavior of Salt - Utrecht University, Utrecht, Netherlands Duration: 6 Jul 2022 → 8 Jul 2022

Conference

Conference	10th Conference on the Mechanical Behavior of Salt
Abbreviated title	SaltMech X
Country/Territory	Netherlands
City	Utrecht
Period	6/07/22 → 8/07/22

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The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022
de Bresser, J. H. P. (Editor), Drury, M. R. (Editor), Fokker, P. A. (Editor), Gazzani, M. (Editor), Hangx, S. J. T. (Editor), Niemeijer, A. R. (Editor) & Spiers, C. J. (Editor), 5 Jul 2022, 1 ed. London: CRC Press. 690 p.
Research output: Book/Report › Book editing › Academic

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Ji, Y., Spiers, C. J., Hangx, S. J. T., de Bresser, J. H. P., & Drury, M. R. (2022). 4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look. In J. H. P. D. Bresser, M. R. Drury, P. A. Fokker, M. Gazzani, S. J. T. Hangx, A. R. Niemeijer, & C. J. Spiers (Eds.), The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022 (1 ed., pp. 88-97). CRC Press. https://doi.org/10.1201/9781003295808-9

Ji, Y. ; Spiers, C.J. ; Hangx, S.J.T. et al. / 4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt : A first look. The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022. editor / J.H.P. de Bresser ; M.R. Drury ; P. A. Fokker ; M. Gazzani ; S.J.T. Hangx ; A.R. Niemeijer ; C.J. Spiers. 1. ed. London : CRC Press, 2022. pp. 88-97

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title = "4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look",

abstract = "Rock salt formations represent key options for storage of natural gas, hydrogen, and compressed air energy, and for storage or disposal of radioactive waste. At depths beyond a few tens or hundreds of meters, undisturbed halite-dominated (>90\%) rock salt deposits are usually impermeable and have very low porosity. However, as a result of excavation, nearfield microcracking and associated dilatancy occur in rock salt, increasing porosity and permeability. The connectivity of a brine- or water-vapour-filled microcrack network in deformation-damaged salt, is expected to decrease over time, partly due to dissolutionprecipitation healing. Here, we employ 4D (i.e., time-resolved 3D) microtomography to study the long-term evolution of dilated grain boundary and microcrack networks developed in deformation-damaged natural salt by such brine-assisted processes. We found substantial microstructural modification or “healing” over periods of days to a few months. Cracks and dilated grain boundaries became crystallographically faceted, necked, discontinuous, and disconnected, and often migrated to “recrystallize” the material, producing an increase in tortuosity and a decrease in connectivity of the crack network. The magnitude and rate of associated permeability reduction and its evolution with time remain to be determined in future studies. ",

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Ji, Y, Spiers, CJ , Hangx, SJT , de Bresser, JHP & Drury, MR 2022, 4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look. in JHPD Bresser, MR Drury, PA Fokker, M Gazzani, SJT Hangx, AR Niemeijer & CJ Spiers (eds), The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022. 1 edn, CRC Press, London, pp. 88-97, 10th Conference on the Mechanical Behavior of Salt, Utrecht, Netherlands, 6/07/22. https://doi.org/10.1201/9781003295808-9

4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look. / Ji, Y.; Spiers, C.J.; Hangx, S.J.T. et al.
The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022. ed. / J.H.P. de Bresser; M.R. Drury; P. A. Fokker; M. Gazzani; S.J.T. Hangx; A.R. Niemeijer; C.J. Spiers. 1. ed. London: CRC Press, 2022. p. 88-97.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

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N2 - Rock salt formations represent key options for storage of natural gas, hydrogen, and compressed air energy, and for storage or disposal of radioactive waste. At depths beyond a few tens or hundreds of meters, undisturbed halite-dominated (>90%) rock salt deposits are usually impermeable and have very low porosity. However, as a result of excavation, nearfield microcracking and associated dilatancy occur in rock salt, increasing porosity and permeability. The connectivity of a brine- or water-vapour-filled microcrack network in deformation-damaged salt, is expected to decrease over time, partly due to dissolutionprecipitation healing. Here, we employ 4D (i.e., time-resolved 3D) microtomography to study the long-term evolution of dilated grain boundary and microcrack networks developed in deformation-damaged natural salt by such brine-assisted processes. We found substantial microstructural modification or “healing” over periods of days to a few months. Cracks and dilated grain boundaries became crystallographically faceted, necked, discontinuous, and disconnected, and often migrated to “recrystallize” the material, producing an increase in tortuosity and a decrease in connectivity of the crack network. The magnitude and rate of associated permeability reduction and its evolution with time remain to be determined in future studies.

AB - Rock salt formations represent key options for storage of natural gas, hydrogen, and compressed air energy, and for storage or disposal of radioactive waste. At depths beyond a few tens or hundreds of meters, undisturbed halite-dominated (>90%) rock salt deposits are usually impermeable and have very low porosity. However, as a result of excavation, nearfield microcracking and associated dilatancy occur in rock salt, increasing porosity and permeability. The connectivity of a brine- or water-vapour-filled microcrack network in deformation-damaged salt, is expected to decrease over time, partly due to dissolutionprecipitation healing. Here, we employ 4D (i.e., time-resolved 3D) microtomography to study the long-term evolution of dilated grain boundary and microcrack networks developed in deformation-damaged natural salt by such brine-assisted processes. We found substantial microstructural modification or “healing” over periods of days to a few months. Cracks and dilated grain boundaries became crystallographically faceted, necked, discontinuous, and disconnected, and often migrated to “recrystallize” the material, producing an increase in tortuosity and a decrease in connectivity of the crack network. The magnitude and rate of associated permeability reduction and its evolution with time remain to be determined in future studies.

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PB - CRC Press

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Ji Y, Spiers CJ , Hangx SJT , de Bresser JHP , Drury MR. 4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look. In Bresser JHPD, Drury MR, Fokker PA, Gazzani M, Hangx SJT, Niemeijer AR, Spiers CJ, editors, The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022. 1 ed. London: CRC Press. 2022. p. 88-97 doi: 10.1201/9781003295808-9

4D microtomography of brine-assisted healing processes in deformation-damaged rocksalt: A first look

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The Mechanical Behavior of Salt X: Proceedings of the 10th Conference on the Mechanical Behavior of Salt (SaltMech X), Utrecht, The Netherlands, 06-08 July 2022

Cite this