Chemically and mechanically mediated influences on the transport and mechanical characteristics of rock fractures

Min, Kyoung-Bok; Rutqvist, Jonny; Elsworth, Derek

doi:10.1016/j.ijrmms.2008.04.002

Cited by 72 publications

(41 citation statements)

References 25 publications

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“…Moreover, the potential coupling to chemical processes (i.e. THMC), for example by thermally enhanced pressure solution of fracture surface asperities (Min et al 2008), may also be important for some geological and repository conditions. Tsang 1996, Rutqvist et al 2001a).…”

Section: Discussionmentioning

confidence: 99%

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

et al. 2008

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This paper presents an international, multiple-code, simulation study of coupled thermal, hydrological, and mechanical (THM) processes and their effect on permeability and fluid flow in fractured rock around heated underground nuclear waste emplacement drifts. Simulations were conducted considering two types of repository settings: (a) open emplacement drifts in relatively shallow unsaturated volcanic rock, and (b) backfilled emplacement drifts in deeper saturated crystalline rock. The results showed that for the two assumed repository settings, the dominant mechanism of changes in rock permeability was thermalmechanically-induced closure (reduced aperture) of vertical fractures, caused by thermal stress resulting from repository-wide heating of the rock mass. The magnitude of thermal-mechanically-induced changes in permeability was more substantial in the case of an emplacement drift located in a relatively shallow, low-stress environment where the rock is more compliant, allowing more substantial fracture closure during thermal stressing. However, in both of the assumed repository settings in this study, the thermalmechanically induced changes in permeability caused relatively small changes in the flow field, with most changes occurring in the vicinity of the emplacement drifts.

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Section: Discussionmentioning

confidence: 99%

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

et al. 2008

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“…Similar shrinkage effects as a result of mineral dissolution in carbonate-rich rock are also possible (Espinoza et al 2011). However, most of the important coupled chemical-mechanical effects are expected to occur along faults and fractures that might exist or were created by high CO 2 injection pressure (Johnson et al 2005;Gherardi et al 2007;Andreani et al 2008;Min et al 2009;Gaus 2010).…”

Section: Caprock Sealing Performacementioning

confidence: 99%

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

2012

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This paper provides a review of the geomechanics and modeling of geomechanics associated with geologic carbon storage (GCS), focusing on storage in deep sedimentary formations, in particular saline aquifers. The paper first introduces the concept of storage in deep sedimentary formations, the geomechanical processes and issues related with such an operation, and the relevant geomechanical modeling tools. This is followed by a more detailed review of geomechanical aspects, including reservoir stressstrain and microseismicity, well integrity, caprock sealing performance, and the potential for fault reactivation and notable (felt) seismic events. Geomechanical observations at current GCS field deploy-

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“…Cleat closure can occur with increasing effective stress resulting in the closure of smaller cleats, and a reduction in permeability as the interconnections between pores and cleats are reduced (Soeder, 1991). Empirical relationships between permeability and effective stress have been proposed (Bai et al, 1995;Durucan and Edwards, 1986;Min et al, 2009;Seidle et al, 1992;Somerton et al, 1975) including the role of stress cycling on permeability loss (Harpalani and Chen, 1995;Somerton et al, 1975).…”

Section: Introductionmentioning

confidence: 99%

Optimizing enhanced coalbed methane recovery for unhindered production and CO2 injectivity

Kumar¹,

Elsworth²,

Liu

et al. 2012

International Journal of Greenhouse Gas Control

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Chemically and mechanically mediated influences on the transport and mechanical characteristics of rock fractures

Cited by 72 publications

References 25 publications

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

Optimizing enhanced coalbed methane recovery for unhindered production and CO2 injectivity

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