Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Citations (Scopus)

Abstract

The Law of Effective Stress has found wide application in structural geology, rock mechanics and petroleum geology. The commonly used form of this law relies on an assumption of isotropic porosity. The porosity in and around fluid-saturated fault zones is likely to be dominated by tectonically induced cracks of various shapes and sizes. Previously published field and laboratory data show that these cracks occur in distinct patterns of preferred orientation, and that these patterns vary around the fault zone. This paper uses the more general form of the Law of Effective Stress which incorporates anisotropic poroelasticity to model the geomechanical response of fault zones surrounded by patterns of oriented cracks. Predictions of fault stability in response to fluid pressure changes are shown to depend on both the nature (or symmetry) of the crack pattern and the orientation of the crack patterns with respect to the in situ stress. More complete data on the porosity of natural fault zones will enable more accurate predictions of fault stability in the subsurface.
Original languageEnglish
Title of host publicationFaulting, Fracturing and Igneous Intrusion in the Earth's Crust
EditorsDavid Healy, Rob Butler, Zoe Shipton, Rick Sibson
PublisherGeological Society of London
Pages201-214
Number of pages14
Volume367
DOIs
Publication statusPublished - 2012

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poroelasticity
fluid pressure
pore pressure
crack
fault zone
rock
porosity
effective stress
structural geology
phreatic zone
rock mechanics
preferred orientation
in situ stress
prediction
symmetry
fluid

Cite this

Healy, D. (2012). Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure. In D. Healy, R. Butler, Z. Shipton, & R. Sibson (Eds.), Faulting, Fracturing and Igneous Intrusion in the Earth's Crust (Vol. 367, pp. 201-214). Geological Society of London. https://doi.org/0.1144/SP367.14

Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure. / Healy, David.

Faulting, Fracturing and Igneous Intrusion in the Earth's Crust. ed. / David Healy; Rob Butler; Zoe Shipton; Rick Sibson. Vol. 367 Geological Society of London, 2012. p. 201-214.

Research output: Chapter in Book/Report/Conference proceedingChapter

Healy, D 2012, Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure. in D Healy, R Butler, Z Shipton & R Sibson (eds), Faulting, Fracturing and Igneous Intrusion in the Earth's Crust. vol. 367, Geological Society of London, pp. 201-214. https://doi.org/0.1144/SP367.14
Healy D. Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure. In Healy D, Butler R, Shipton Z, Sibson R, editors, Faulting, Fracturing and Igneous Intrusion in the Earth's Crust. Vol. 367. Geological Society of London. 2012. p. 201-214 https://doi.org/0.1144/SP367.14
Healy, David. / Anisotropic poroelasticity and the response of faulted rock to changes in pore-fluid pressure. Faulting, Fracturing and Igneous Intrusion in the Earth's Crust. editor / David Healy ; Rob Butler ; Zoe Shipton ; Rick Sibson. Vol. 367 Geological Society of London, 2012. pp. 201-214
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