Micromechanics of stress-induced permeability anisotropy and damage in sedimentary rock

Bruno, Michael S.

doi:10.1016/0167-6636(94)90004-3

Cited by 70 publications

(40 citation statements)

References 31 publications

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“…This means that the observed strain-induced permeability changes stand only for the axial direction of the sample cylinder and the current applied stress system. Data concerning stressed sandstones confirm this observation [Bruno, 1994;. Consequently, measurements of permeabilities in the direction of compression or extension do not adequately represent the overall permeability of the rock.…”

Section: Discussionsupporting

confidence: 65%

Evolution of dilatancy and permeability in rock salt during hydrostatic compaction and triaxial deformation

Popp¹,

Kern²,

Schulze³

2001

J. Geophys. Res.

102

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Abstract. Combined gas permeability and P and $ wave velocity measurements were carried out on rock salt samples from the Gorleben salt dome and the Morsleben salt mine under hydrostatic and triaxial loading condions, mostly at room temperature. Permeabilities in the as-received samples vary between 10 46 and 2xl 0 '20 m 2. The initial permeability is primarily due to decompaction induced by drilling, core retrieval and sample preparation. Hydrostatic loading gives rise to a marked decrease of permeability and a coeval significant increase of P and $ wave velocities due to progressive closure of grain boundary cracks, tending to approach the in situ matrix permeability (< 10 '2ø m2). The pore space sensitivity of P and $ wave velocities is used to monitor the in situ state of the microstructure. Their reversals define the boundary in the state of stresses between dilatant and compactive domains (dilatancy boundary). Dilatancy during triaxial deformation of the compacted rock salt samples is found to evolve stress dependent in various stages. The crack initiation stress increases from -•18 MPa differential stress at 10 MPa confining pressure to -•30 MPa at confining pressures above-•70 MPa. Dilatancy is due to the opening of grain boundary and (100) cleavage cracks and depends on the applied confining pressure. The orientation of the open cracks is primarily controlled by the loading geometry system (compression, extension). As a consequence, permeability increases dramatically with progressive dilatancy, followed by a period of plus/minus constant permeability during strain hardening up to 10% axial strain or even more. This suggests that the evolution of permeability is not only a function of dilatancy but also of microcrack linkage. Importantly, the anisotropic crack array within the samples causes a strong directional dependence of permeability.

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Section: Discussionsupporting

confidence: 65%

Evolution of dilatancy and permeability in rock salt during hydrostatic compaction and triaxial deformation

Popp¹,

Kern²,

Schulze³

2001

J. Geophys. Res.

102

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“…To facilitate the use of two-dimensional fluid coupling for applications in porous media, an assumption about the fluid flow paths is made. This problem has been addressed previously for the case of flow network models [Bruno and Nelson, 1991;Bruno, 1994;Li and Holt, 2001] and continuum Darcy's models [O'Connor et al, 1997]. In both models, fluid is assumed to flow out of plane and around solids.…”

Section: Model Two Dimensionalitymentioning

confidence: 99%

Direct simulation of fluid‐solid mechanics in porous media using the discrete element and lattice‐Boltzmann methods

Boutt¹,

Cook²,

McPherson³

et al. 2007

J. Geophys. Res.

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[1] A detailed understanding of the coupling between fluid and solid mechanics is important for understanding many processes in Earth sciences. Numerical models are a popular means for exploring these processes, but most models do not adequately handle all aspects of this coupling. This paper presents the application of a micromechanically based fluid-solid coupling scheme, lattice-Boltzmann discrete element method (LBDEM), for porous media simulation. The LBDEM approach couples the lattice-Boltzmann method for fluid mechanics and a discrete element method for solid mechanics. At the heart of this coupling is a previously developed boundary condition that has never been applied to coupled fluid-solid mechanics in porous media. Quantitative comparisons of model results to a one-dimensional analytical solution for fluid flow in a slightly deformable medium indicate a good match to the predicted continuum-scale fluid diffusion-like profile. Coupling of the numerical formulation is demonstrated through simulation of porous medium consolidation with the model capturing poroelastic behavior, such as the coupling between applied stress and fluid pressure rise. Finally, the LBDEM model is used to simulate the genesis and propagation of natural hydraulic fractures. The model provides insight into the relationship between fluid flow and propagation of fractures in strongly coupled systems. The LBDEM model captures the dominant dynamics of fluid-solid micromechanics of hydraulic fracturing and classes of problems that involve strongly coupled fluid-solid behavior.

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“…It saves the time for calculating the real pore volumes and makes the pore pressure reach steady state quickly. depends on stresses (Zoback and Byerlee, 1975;Fredrich, et al, 1993;Bruno, 1994). In some cases, permeability may be dramatically changed due to damage developments (especially some critical cases like shear or compaction localization, Holt, 1990;Ruistuen, 1997;Boutéca et al, 2000).…”

Section: Virtual Pore Volume For Quasi Steady State Flowmentioning

confidence: 99%

“…Many researchers have studied fluid coupling in 2D particle models for different purposes with different approaches (Thallak et al, 1991;Bruno, 1994;Cundall, 1999;Cerasi et al, 2000;Bruno et al, 2001;Li and Holt, 2001b). Based on the authors' previous study, the algorithm of fluid coupling in the 2D model has been extended to the 3D model.…”

Section: Basics Of Fluid Coupling In Particle Modelmentioning

confidence: 99%

Particle Scale Reservoir Mechanics

2002

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Mécanique du réservoir à l'échelle des grains -Cet article résume quelques déve-loppements et applications de la modélisation par particules discrètes, basés sur le code commercial PFC (Particle Flow Code). Nous décrivons ci-après les exemples ayant un rapport avec le comportement géomécanique du réservoir : -Des résultats de simulations numériques et d'expériences sont présentés, illustrant une évolution nonlinéaire de la compaction induite par déplétion et du chemin de contrainte pour des simulations de roches de réservoir, c'est-à-dire des matériaux formés sous contrainte. Cette non-linéarité est souvent perdue dans les mesures effectuées sur carotte, et cela est dû au relâchement de contrainte intervenant après carottage (dommage de carottage). -Des superparticules anguleuses et fissurables ont été implémentées dans le modèle particulaire et utilisées pour simuler la formation de bandes de compaction à forts niveaux de contrainte. Le modèle est aussi utilisé pour étudier la formation de bandes de cisaillement à des niveaux de confinement inférieurs. -Un schéma numérique permettant un couplage fluide à été développé, aussi bien pour des modèles 2D que 3D, et appliqué à l'étude de la dépendance de la perméabilité au niveau de contrainte. -La dépendance des propriétés acoustiques par rapport au niveau de contrainte dans un assemblage de particules soudées a été étudiée. Les résultats préliminaires des simulations avec divers développements montrent un accord qualitatif mais aussi quantitatif avec les expériences. Cela démontre la faisabilité de l'application d'une modélisation par particules discrètes comme laboratoire numérique pour l'étude de la mécanique du réservoir à l'échelle des grains. Abstract -Particle Scale Reservoir Mechanics -This paper summarizes some developments and applications of discrete particle modelling based on the commercial code PFC (Particle Flow Code

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Micromechanics of stress-induced permeability anisotropy and damage in sedimentary rock

Cited by 70 publications

References 31 publications

Evolution of dilatancy and permeability in rock salt during hydrostatic compaction and triaxial deformation

Evolution of dilatancy and permeability in rock salt during hydrostatic compaction and triaxial deformation

Direct simulation of fluid‐solid mechanics in porous media using the discrete element and lattice‐Boltzmann methods

Particle Scale Reservoir Mechanics

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