The importance of fracture-healing on the deformation of fluid-filled layered systems - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Structural Geology Année : 2014

The importance of fracture-healing on the deformation of fluid-filled layered systems

Résumé

Understanding the fracturingehealingerefracturing cycle is a fundamental part of studying the deformation dynamics and the permeability evolution of rock systems. Previous studies, however, have not examined the influence of healing i.e. fracture-closure through vein formation and the mechanical properties of the " healed " fractures (veins) on the rock deformation. We present results from a two-dimensional coupled hydro-mechanical model which simulates large time and spatial scale dynamic fracturing and healing of a porous medium under the influence of gravity, tectonic stretching and elevated fluid pressures. Our results show that healing decreases the local porosity, and that the veins' strength is more important than their elastic modulus in influencing the deformation and the evolving patterns. Hard veins make the aggregate progressively stronger, results in an overall healing of the system, limited fracturing and thus fluid flow, greater stresses and delayed fracture saturation. Weak veins make the system weaker in which refracturing of the healed bonds is the dominant process that creates more open fractures and thus increases the permeability. These results provide clues for the importance of the veins' mechanical properties and can enhance our understanding of the deformation dynamics and the permeability evolution of the rock systems.
Fichier principal
Vignette du fichier
Manuscript Healing-Vassetal.pdf (14.95 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01198604 , version 1 (26-09-2015)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Anna Vass, Daniel Koehn, Irfan Ghani, Sandra Piazolo, Renaud Toussaint. The importance of fracture-healing on the deformation of fluid-filled layered systems. Journal of Structural Geology, 2014, 67, pp.94-106. ⟨10.1016/j.jsg.2014.07.007⟩. ⟨hal-01198604⟩
449 Consultations
107 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More