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| Titel |
Microdeformation and subcritical cracking in chalk |
| VerfasserIn |
Anne Bergsaker, Dag Kristian Dysthe |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127946
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| Publikation (Nr.) |
 EGU/EGU2016-7878.pdf |
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| Zusammenfassung |
| Deformation processes in chalks, both in relation to changing pore fluids and stress
conditions has been of great interest as chalk is an important reservoir rock for both
hydrocarbons and ground water. Lately it has also gained interest as a potential reservoir rock
for captured CO2. Chalks are composed of large amounts of biogenic calcite grains, the
skeletal debris of marine microorganisms. Its deformation is highly time and stress
dependent, and governed by a transition from distributed to localized deformation at the onset
of yield, affected by mechanisms such as subcritical crack growth and pore collapse. We
present a microdeformation rig which makes use of thermal expansion as a means of
subjecting small samples to strictly controlled tensile stresses. High resolution imaging
provides resolutions down to 0.5 micrometers, enabling study of pore scale processes during
slow deformation. Examples of localized and distributed deformation are presented. |
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