Introduction

McClure, Mark; Horne, Roland N.

doi:10.1007/978-3-319-00383-2_1

Cited by 3 publications

(5 citation statements)

References 48 publications

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“…This fracture modeling strategy is valid if fractures are more permeable than the matrix, that is, it is limited to fractures being channels for flow drainage (Segura & Carol, 2008b,a; Jha & Juanes, 2014; Cueto‐Felgueroso et al., 2017, 2018; Andrés et al., 2021). This approach agrees with proposals of other authors to deal with the fracture network modeling (McClure & Horne, 2013; Garipov & Hui, 2019; Berre et al., 2020), including the full simulation of matrix and fractures with poroelastic coupling. It also allows to vary parameters such as fracture aperture or porosity depending on the stress or strain level, although this barely affects the results (see Appendix ) (Bandis et al., 1983; Chin et al., 2000; Hsiung et al., 2005; Rutqvist et al., 2005; Cappa & Rutqvist, 2011).…”

Section: Background and Methodologysupporting

confidence: 88%

“…Thus, we employ here linear poroelasticity to investigate the impact of medium heterogeneity on flow and deformation in highly heterogeneous fractured media. In numerical models, discrete fractures are often incorporated as lower-dimensional objects combined with a rigorous coupling between matrix and fracture flow and deformation that allow the continuity of fluid flow and displacements (Segura & Carol, 2008a;McClure & Horne, 2013;Jha & Juanes, 2014;Berre et al, 2019Berre et al, , 2020. The density and length distribution of fractures in natural systems is large and uncertain enough so that the discrete fractures cannot be fully incorporated in explicit models.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous Pressure Diffusion and Deformation in Two‐ and Three‐Dimensional Heterogeneous Fractured Media

Andrés,

Dentz,

Cueto‐Felgueroso

2024

Water Resources Research

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In fractured and stress‐sensitive reservoirs and aquifers, hydromechanical coupling is important, in connection with their heat and solute transport properties, and because the fluid production or extraction leads to land subsidence and potentially to induced seismicity. Classical dual‐porosity poroelasticity (DPP) models cannot upscale pressure diffusion and deformation in fractured porous media, which are characterized by anomalous behaviors that manifest in strong tailing in the temporal evolution of flow rate and subsidence. We study these behaviors using detailed numerical simulations of fluid production in naturally fractured formations characterized by multi‐Gaussian distributions of the matrix permeability. We find that the tailing behaviors depend on the permeability contrast between fracture and matrix, on the permeability distribution in the matrix, and on the correlation length. We use a non–equilibrium, multi‐porosity model to quantify the coupled behaviors of anomalous pressure diffusion, fluid flow and deformation. The model is parameterized by medium and fluid properties, which set the characteristic pressure diffusion time scales. It allows to identify the emerging scaling regimes and scaling behaviors of flow rate and subsidence. We propose a model implementation that captures the full anomalous evolution of flow rates and displacements observed in the detailed numerical simulations in terms of the permeability distribution and matrix length scales. The presented results shed new light on the controls of medium heterogeneity and geometry on pressure diffusion, fluid production and subsidence in highly heterogeneous fractured media.

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Section: Background and Methodologysupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Anomalous Pressure Diffusion and Deformation in Two‐ and Three‐Dimensional Heterogeneous Fractured Media

Andrés,

Dentz,

Cueto‐Felgueroso

2024

Water Resources Research

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“…We can speculate that the use of more complex models that include shear stress and wear processes can strongly improve the prediction of transmissivity with shear displacement (Aghababaei et al, 2016;Frérot et al, 2019;Milanese et al, 2019;Molinari et al, 2018;Shvarts & Yastrebov, 2018a, 2018bShvarts, 2019;Yastrebov et al, 2017). The results obtained for a single rough-fault could then be input into discrete fracture models (DFMs) to evaluate the hydraulic transport in fracture networks (McClure & Horne, 2013).…”

Section: Discussion and Implications For Geo-energy Reservoirsmentioning

confidence: 99%

Hydraulic transport through calcite bearing faults with customized roughness: Effects of normal and shear loading.

Acosta

Violay

Maye³

2020

Preprint

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Understanding fluid flow in rough fractures is of high importance to large scale geologic processes and to most anthropogenic geo-energy activities. Here we conducted fluid transport experiments on Carrara marble fractures with a novel customized surface topography. Transmissivity measurements were conducted under mechanical loading conditions representative of deep geothermal reservoirs (normal stresses from 20 to 70 MPa and shear stresses from 0 to 30 MPa). A numerical procedure simulating normal contact and fluid flow through fractures with complex geometries was validated toward experiments. Using it, we isolated the effects of roughness parameters on fracture fluid flow. Under normal loading, we find that (i) the transmissivity decreases with normal loading and is strongly dependent on fault surface geometry and (ii) the standard deviation of heights (h RMS ) and macroscopic wavelength of the surface asperities control fracture transmissivity. Transmissivity evolution is nonmonotonic, with more than 4 orders of magnitude difference for small variations of macroscopic wavelength and h RMS roughness. Reversible elastic shear loading has little effect on transmissivity; it can increase or decrease depending on contact geometry and overall stress state on the fault. Irreversible shear displacement (up to 1 mm offset) slightly decreases transmissivity and its variation with irreversible shear displacements can be predicted numerically and geometrically at low normal stress only. Finally, irreversible changes in surface roughness (plasticity and wear) due to shear displacement result in a permanent decrease of transmissivity when decreasing differential stress. Generally, reduction of a carbonate fault's effective stress increases its transmissivity while inducing small shear displacements does not.

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“…To assess fluid flow and bedrock strain evolution, we use a continuous approach instead of Extended Finite Element Method (XFEM) or Discrete Fracture Network (DFN) formulations in which fractures are modeled (e.g. McClure and Horne, 2013;Wang, 2015). Because fluid flow in geothermal systems is heavily controlled by the presence of fracture networks (Sanderson and Nixon, 2015), advantages and limitations of our modelling approach exist when comparing it against those approaches.…”

Section: Numerical and Mechanical Validationmentioning

confidence: 99%

“…However, their development is still, to our knowledge, limited to small domains, with high numerical cost. Similarly, DFN three-dimensional models still need to be developed (McClure and Horne, 2013). Even though traditional FEM is not able to represent fractures, its robustness allow to tackle large and complex 3D geometries, at a lower computational cost.…”

Section: Numerical and Mechanical Validationmentioning

confidence: 99%

Fluid flow migration, rock stress and deformation due to a crustal fault slip in a geothermal system: A poro-elasto-plastic perspective

Sáez-Leiva

Hurtado

Gerbault

et al. 2023

Earth and Planetary Science Letters

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Introduction

Cited by 3 publications

References 48 publications

Anomalous Pressure Diffusion and Deformation in Two‐ and Three‐Dimensional Heterogeneous Fractured Media

Anomalous Pressure Diffusion and Deformation in Two‐ and Three‐Dimensional Heterogeneous Fractured Media

Hydraulic transport through calcite bearing faults with customized roughness: Effects of normal and shear loading.

Fluid flow migration, rock stress and deformation due to a crustal fault slip in a geothermal system: A poro-elasto-plastic perspective

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