Pore Pressure Drop During Dynamic Rupture and Conditions for Dilatancy Hardening

Pařez, Stanislav; Kozakovic, Martin; Havlica, Jaromír

doi:10.1029/2023jb026396

Cited by 3 publications

(1 citation statement)

References 111 publications

(324 reference statements)

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“…From a more theoretical perspective, important insights come from analytical solutions for fluid-driven aseismic slip in response to localized injection, both two-dimensional [35,38,39] and three-dimensional [40], and for more idealized spring-slider models [41]. Numerical simulations have helped quantify the importance of dilatancy as a stabilizing mechanism [42][43][44][45]. Simulations accounting for permeability enhancement have demonstrated its importance in matching laboratory and field data [20,21,35].…”

Section: Introductionmentioning

confidence: 99%

Fluid-driven aseismic fault slip with permeability enhancement and dilatancy

Dunham

2024

Phil. Trans. R. Soc. A.

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Injection-induced seismicity and aseismic slip often involve the reactivation of long-dormant faults, which may have extremely low permeability prior to slip. In contrast, most previous models of fluid-driven aseismic slip have assumed linear pressure diffusion in a fault zone of constant permeability and porosity. Slip occurs within a frictional shear crack whose edge can either lag or lead pressure diffusion, depending on the dimensionless stress-injection parameter that quantifies the prestress and injection conditions. Here, we extend this foundational work by accounting for permeability enhancement and dilatancy, assumed to occur instantaneously upon the onset of slip. The fault zone ahead of the crack is assumed to be impermeable, so fluid flow and pressure diffusion are confined to the interior, slipped part of the crack. The confinement of flow increases the pressurization rate and reduction of fault strength, facilitating crack growth even for severely understressed faults. Suctions from dilatancy slow crack growth, preventing propagation beyond the hydraulic diffusion length. Our new two-dimensional and three-dimensional solutions can facilitate the interpretation of induced seismicity data sets. They are especially relevant for faults in initially low permeability formations, such as shale layers serving as caprock seals for geologic carbon storage, or for hydraulic stimulation of geothermal reservoirs. This article is part of the theme issue ‘Induced seismicity in coupled subsurface systems’.

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Section: Introductionmentioning

confidence: 99%

Fluid-driven aseismic fault slip with permeability enhancement and dilatancy

Dunham

2024

Phil. Trans. R. Soc. A.

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Topical Issues in Hydrogeology of Seismogenic Fault Zones

Kocharyan,

Shatunov

2024

Izv., Phys. Solid Earth

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Topical issues in hydrogeology of seismogenic fault zones

Kocharyan,

Shatunova

2024

Fizika zemli

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The hydrogeology of fault zones, especially at considerable depth, is perhaps the most poorly developed area of earthquake source mechanics. This is due both to the insufficient data on the filtration characteristics of the geomaterial at large depths and to the complexity of the processes of mass transfer, fracture formation and healing under high temperatures and pressures. In these conditions, a fluid obviously has a very strong effect of on both the friction characteristics and the stress state in the vicinity of the slip zone. Fluids are carriers of dissolved matter and thermal energy, an effective catalyst for various types of metamorphic transformations. According to some models, fluid flows can be triggers for the start and stop of seismogenic ruptures. Constructing a complex computational model that adequately describes the processes of preparation, initiation, and stopping of various slip modes along faults, which is a recent trend in world seismology, requires developing the ideas about fluid dynamics of seismogenic faults. This review summarizes recent information on the hydrogeology of fault zones. Models and ideas about the role of fluids at different stages of the seismic cycle, derived from the field data, laboratory and in situ experiments, and numerical calculations, are analyzed.

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Pore Pressure Drop During Dynamic Rupture and Conditions for Dilatancy Hardening

Cited by 3 publications

References 111 publications

Fluid-driven aseismic fault slip with permeability enhancement and dilatancy

Fluid-driven aseismic fault slip with permeability enhancement and dilatancy

Topical Issues in Hydrogeology of Seismogenic Fault Zones

Topical issues in hydrogeology of seismogenic fault zones

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