How Equivalent Are Equivalent Porous Media?

Zareidarmiyan, Ahmad; Parisio, Francesco; Makhnenko, Roman Y.; Salari-Rad, Hossein; Vilarrasa, Víctor

doi:10.1029/2020gl089163

Cited by 26 publications

(23 citation statements)

References 74 publications

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“…In addition, the results of permeability measurements and stress-permeability relation are also known to be size-dependent 10 . Finally, the laboratory tests are usually conducted on specimens with one or several fractures, while the fracture network should be considered for the in-situ conditions 23 . All of these challenges need to be properly addressed before the implementation of laboratory measured properties in the reservoir-scale numerical models.…”

Section: Discussionmentioning

confidence: 99%

Hydromechanical impact of basement rock on injection-induced seismicity in Illinois Basin

Bondarenko

Podladchikov

Makhnenko

2022

Sci Rep

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The common explanation of observed injection-induced microseismicity is based on the measured stress state at the injection interval and the assumption that it remains the same in the vicinity. We argue here that representing the stress state in different geologic formations over the injection site with the single Mohr’s circle is insufficient due to local stratigraphic features and contrast in compressibilities of the involved formations. The role of hydromechanical coupling in the microseismic response is also crucial for the proper assessment of the problem. Thoroughly monitored Illinois Basin Decatur Project revealed the majority of CO2 injection-associated microseismic events being originated in the crystalline basement. Even though basement faults can serve as the conduits for fluid flow—the predicted pressure increase seems to be insufficient to trigger seismicity. To address this issue, accurate laboratory measurements of rock properties from the involved formations are conducted. The pre-injection stress state and its evolution are evaluated with the hydromechanically coupled numerical model. It appears that the presence of an offset in a stiff competent layer affects the stress state in its vicinity. Therefore, both the pre-injection stress state and its evolution during the fluid injection should be addressed during the induced seismicity assessment.

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Section: Discussionmentioning

confidence: 99%

Hydromechanical impact of basement rock on injection-induced seismicity in Illinois Basin

Bondarenko

Podladchikov

Makhnenko

2022

Sci Rep

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“…However, the simulation of the hydraulic stimulation shows that pore pressure does not reach the critical pressure for most of the faults. Thus, even though pore pressure buildup has a direct effect on faults, especially in those in the vicinity of the well, other triggering mechanisms are relevant and should be taken into account to enable reliable estimates of induced seismicity 41 .…”

Section: Discussionmentioning

confidence: 99%

Insights on post-injection seismicity through analysis of the Enhanced Geothermal System at Basel (Switzerland)

Boyet

Simone

et al. 2022

Preprint

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Induced seismicity is a limiting factor for the development of Enhanced Geothermal Systems (EGS) and has led to the cancellation of a few projects. Its causal mechanisms are not fully understood, especially those of post-injection seismicity. Here, we revisit the controversial case of the Basel EGS (Switzerland) to better understand the mechanisms that induced seismicity by simulating the hydro-mechanical response to hydraulic stimulation of a pre-existing fault network built on the basis of the monitored seismicity. Simulation results show that the faults located in the vicinity of the injection well fail during injection, triggered by pore pressure buildup coupled with poroelastic stressing, whereas distant faults are stabilized by poroelastic effects depending on the orientation. After injection stops, poroelastic stress relaxation leads to the immediate rupture of these previously stabilized faults. Shear-slip stress transfer, which also contributes to post-injection reactivation of distant faults, is enhanced in faults with slip-induced friction weakening. This work presents a modeling approach to understand the multiple processes leading to the rupture of pre-existent fractures in EGS reservoirs, which is key to improve our induced seismicity forecasting and mitigating capability.

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“…The strong contrast between fracture and matrix properties further challenges equivalent continuum models. For example, recent studies (Haagenson & Rajaram, 2021) suggest that although the propagation of spatially averaged fields (e.g., radially averaged pressure, temperature or concentration) may be accurately captured in equivalent continuum representations, propagation of high pressures and temperature perturbations, which drive stress‐dependent fracture behavior and shear slip, which are the critical elements of H‐M coupling, could be significantly misrepresented by equivalent continuum models (Zareidarmiyan et al., 2021). Again, discrete methods can more accurately capture the propagation of these high pressure and temperature perturbations since network structure is explicitly considered, as clarified in the above studies.…”

Section: Models Of T‐h‐m‐c Coupled Processes In Fractured Rockmentioning

confidence: 99%

“…Several recent modeling studies have shown that the propagation of seismic slip in fractured rock involves an apparent diffusivity (“seismic diffusivity”) that can exceed the hydraulic diffusivity by more than an order of magnitude (Haagenson & Rajaram, 2021; Zareidarmiyan et al., 2021). Given the uncertainty associated at various levels with modeling IIS, including data assimilation, T‐H‐M‐C process models, and the locations of existing faults, a general‐purpose probabilistic risk assessment framework is needed (Baisch et al., 2019; Bommer et al., 2015).…”

Section: Uncertainty Quantification Multifidelity Models and Emulatorsmentioning

confidence: 99%

From Fluid Flow to Coupled Processes in Fractured Rock: Recent Advances and New Frontiers

Viswanathan

Ajo‐Franklin

Birkhölzer

et al. 2022

Reviews of Geophysics

113

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Quantitative predictions of natural and induced phenomena in fractured rock is one of the great challenges in the Earth and Energy Sciences with far‐reaching economic and environmental impacts. Fractures occupy a very small volume of a subsurface formation but often dominate fluid flow, solute transport and mechanical deformation behavior. They play a central role in CO2 sequestration, nuclear waste disposal, hydrogen storage, geothermal energy production, nuclear nonproliferation, and hydrocarbon extraction. These applications require predictions of fracture‐dependent quantities of interest such as CO2 leakage rate, hydrocarbon production, radionuclide plume migration, and seismicity; to be useful, these predictions must account for uncertainty inherent in subsurface systems. Here, we review recent advances in fractured rock research covering field‐ and laboratory‐scale experimentation, numerical simulations, and uncertainty quantification. We discuss how these have greatly improved the fundamental understanding of fractures and one's ability to predict flow and transport in fractured systems. Dedicated field sites provide quantitative measurements of fracture flow that can be used to identify dominant coupled processes and to validate models. Laboratory‐scale experiments fill critical knowledge gaps by providing direct observations and measurements of fracture geometry and flow under controlled conditions that cannot be obtained in the field. Physics‐based simulation of flow and transport provide a bridge in understanding between controlled simple laboratory experiments and the massively complex field‐scale fracture systems. Finally, we review the use of machine learning‐based emulators to rapidly investigate different fracture property scenarios and accelerate physics‐based models by orders of magnitude to enable uncertainty quantification and near real‐time analysis.

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How Equivalent Are Equivalent Porous Media?

Cited by 26 publications

References 74 publications

Hydromechanical impact of basement rock on injection-induced seismicity in Illinois Basin

Hydromechanical impact of basement rock on injection-induced seismicity in Illinois Basin

Insights on post-injection seismicity through analysis of the Enhanced Geothermal System at Basel (Switzerland)

From Fluid Flow to Coupled Processes in Fractured Rock: Recent Advances and New Frontiers

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