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| Titel |
Permeability Changes in Reaction Induced Fracturing |
| VerfasserIn |
Ole Ivar Ulven, Anders Malthe-Sørenssen, Rajiv Kalia |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250083891
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| Zusammenfassung |
| The process of fracture formation due to a volume increasing chemical reaction has been
studied in a variety of different settings, e.g. weathering of dolerites by Røyne et al.[4],
serpentinization and carbonation of peridotite by Rudge et al.[3] and replacement reactions in
silica-poor igneous rocks by Jamtveit et al.[1]. It is generally assumed that fracture
formation will increase the net permeability of the rock, and thus increase the reactant
transport rate and subsequently the total reaction rate, as summarised by Kelemen et
al.[2]. Røyne et al.[4] have shown that transport in fractures will have an effect on
the fracture pattern formed. Understanding the feedback process between fracture
formation and permeability changes is essential in assessing industrial scale CO2
sequestration in ultramafic rock, but little is seemingly known about how large the
permeability change will be in reaction-induced fracturing under compression,
and it remains an open question how sensitive a fracture pattern is to permeability
changes.
In this work, we study the permeability of fractures formed under compression, and we
use a 2D discrete element model to study the fracture patterns and total reaction rates
achieved with different permeabilities. We achieve an improved understanding of the
feedback processes in reaction-driven fracturing, thus improving our ability to decide whether
industrial scale CO2 sequestration in ultramafic rock is a viable option for long-term
handling of CO2.
References
[1]Â Â Â Jamtveit, B, Putnis, C. V., and Malthe-Sørenssen, A., “Reaction induced
fracturing during replacement processes,” Contrib. Mineral Petrol. 157, 2009, pp.
127 – 133.
[2]Â Â Â Kelemen, P., Matter, J., Streit, E. E., Rudge, J. F., Curry, W. B., and
Blusztajn, J., “Rates and Mechanisms of Mineral Carbonation in Peridotite:
Natural Processes and Recipes for Enhanced, in situ CO2 Capture and Storage,”
Annu. Rev. Earth Planet. Sci. 2011. 39:545–76.
[3]Â Â Â Rudge, J. F., Kelemen, P. B., and Spiegelman, M., “A simple model of reaction
induced cracking applied to serpentinization and carbonation of peridotite,” Earth
Planet. Sci. Lett. 291, Issues 1–4, 2010, pp. 215 – 227.
[4]Â Â Â Røyne, A., Jamtveit, B., and Malthe-Sørenssen, A., “Controls on rock
weathering rates by reaction-induced hierarchial fracturing,” Earth Planet. Sci.
Lett. 275, 2008, pp. 364 – 369. |
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