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dc.contributor.author
Igbokwe, Onyedika Anthony
dc.contributor.author
Timothy, Jithender J.
dc.contributor.author
Kumar, Ashwani
dc.contributor.author
Yan, Xiao
dc.contributor.author
Mueller, Mathias
dc.contributor.author
Verdecchia, Alessandro
dc.contributor.author
Meschke, Gunther
dc.contributor.author
Immenhauser, Adrian
dc.date.accessioned
2024-11-19T06:14:34Z
dc.date.available
2024-11-19T06:14:34Z
dc.date.issued
2024-07-08
dc.identifier.issn
1869-9510
dc.identifier.issn
1869-9529
dc.identifier.other
10.5194/se-15-763-2024
dc.identifier.uri
http://hdl.handle.net/20.500.11850/705998
dc.description.abstract
Changing stress regimes control fracture network geometry and influence porosity and permeability in carbonate reservoirs. Using outcrop data analysis and a displacement-based linear elastic finite-element method, we investigate the impact of stress regime change on fracture network permeability. The model is based on fracture networks, specifically fracture substructures. The Latemar, predominantly affected by subsidence deformation and Alpine compression, is taken as an outcrop analogue for an isolated (Mesozoic) carbonate buildup with fracture-dominated permeability. We apply a novel strategy involving two compressive boundary loading conditions constrained by the study area's NW-SE and N-S stress directions. Stress-dependent heterogeneous apertures and effective permeability were computed in the 2D domain by (i) using the local stress state within the fracture substructure and (ii) running a single-phase flow analysis considering the fracture apertures in each fracture substructure. Our results show that the impact of the modelled far-field stresses at (i) subsidence deformation from the NW-SE and (ii) Alpine deformation from N-S increased the overall fracture aperture and permeability. In each case, increasing permeability is associated with open fractures parallel to the orientation of the loading stages and with fracture densities. The anisotropy of permeability is increased by the density and connectedness of the fracture network and affected by shear dilation. The two far-field stresses simultaneously acting within the selected fracture substructure at a different magnitude and orientation do not necessarily cancel each other out in the mechanical deformation modelling. These stresses affect the overall aperture and permeability distributions and the flow patterns. These effects - potentially ignored in simpler stress-dependent permeability - can result in significant inaccuracies in permeability estimation.
dc.title
Impact of stress regime change on the permeability of a naturally fractured carbonate buildup (Latemar, the Dolomites, northern Italy)
dc.type
Journal Article
ethz.journal.title
Solid Earth
ethz.journal.volume
15
ethz.journal.issue
7
ethz.journal.abbreviated
Solid Earth
ethz.pages.start
763
ethz.pages.end
787
ethz.identifier.wos
ethz.date.deposited
2024-11-19T06:14:39Z
ethz.source
WOS
ethz.rosetta.exportRequired
true
ethz.COinS
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