The OECD/NEA Report on Self-sealing of Fractures in Argillaceous Formations in the Context of Geological Disposal of Radioactive Waste

Bock, Helmut

doi:10.1007/978-3-319-09060-3_88

Cited by 40 publications

(61 citation statements)

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“…Cox 2005). At present, brittle structures at Mont Terri are hydraulically indistinguishable from the rock matrix (Meier et al 2002), suggesting an efficient self-sealing mechanism (Bock et al 2010;Fisher et al 2013 …”

Section: Vein Infills As Records Of Fluids Circulating During the Formentioning

confidence: 99%

“…Fluid flow and geochemical disturbances have been observed over no longer than days to years. Further, self-sealing (Marschall et al 2008;Bock et al 2010;Fisher et al 2013) is expected to occur in clay-rich lithologies containing swelling clay minerals, such as the low-permeability sequence at Mont Terri and Mont Russelin, suggesting that fluid pulses were likely short-lived. In order to quantify the diffusive propagation of a geochemical perturbation from a permeable structure into the adjacent rock matrix, simple design calculations were made considering simple in-diffusion from a boundary with time-invariant composition into an infinite half-space.…”

Section: Effect Of Fluid Related To Vein Precipitation On Bulk Pore-wmentioning

confidence: 99%

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Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland)

Mazurek

Haller

2017

Swiss J Geosci

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Data pertinent to pore-water composition in Opalinus Clay in the Mont Terri and Mont Russelin anticlines have been collected over the last 20 years from longterm in situ pore-water sampling in dedicated boreholes, from laboratory analyses on drillcores and from the geochemical characteristics of vein infills. Together with independent knowledge on regional geology, an attempt is made here to constrain the geochemical evolution of the pore-waters. Following basin inversion and the establishement of continental conditions in the late Cretaceous, the Malm limestones acted as a fresh-water upper boundary leading to progressive out-diffusion of salinity from the originally marine pore-waters of the Jurassic low-permeability sequence. Model calculations suggest that at the end of the Palaeogene, pore-water salinity in Opalinus Clay was about half the original value. In the Chattian/Aquitanian, partial evaporation of sea-water occurred. It is postulated that brines diffused into the underlying sequence over a period of several Myr, resulting in an increase of salinity in Opalinus Clay to levels observed today. This hypothesis is further supported by the isotopic signatures of SO 4 2-and 87 Sr/ 86 Sr in current pore-waters. These are not simple binary mixtures of sea and meteoric water, but their Cl -and stable water-isotope signatures can be potentially explained by a component of partially evaporated sea-water. After the re-establishment of fresh-water conditions on the surface and the formation of the Jura Fold and Thrust Belt, erosion caused the activation of aquifers embedding the low-permeability sequence, leading to the curved profiles of various pore-water tracers that are observed today. Fluid flow triggered by deformation events during thrusting and folding of the anticlines occurred and is documented by infrequent vein infills in major fault structures. However, this flow was spatially focussed and of limited duration and so did not markedly affect the bulk pore-water.

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Section: Vein Infills As Records Of Fluids Circulating During the Formentioning

confidence: 99%

Section: Effect Of Fluid Related To Vein Precipitation On Bulk Pore-wmentioning

confidence: 99%

Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland)

Mazurek

Haller

2017

Swiss J Geosci

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“…For this reason, a number of investigations have been published. The mechanical parameter values employed in this study are obtained from laboratory experiments and field research (Corkum and Martin, 2007;Bock, 2009;Bock et al, 2010;Zhang et al, 2008;Jobmann et al, 2010), as shown in Table 2-1. The concrete tunnel lining (15 cm in thickness as shown in Figure 2-6(c)) is modeled with zones to which we assigned the properties of the lining material.…”

Section: Three-dimensional Numerical Model For the Mb Experimentsmentioning

confidence: 99%

Report on THMC Modeling of the Near Field Evolution of a Generic Clay Repository: Model Validation and Demonstration

Liu¹

2013

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“…Recent international examples include the Mesozoic Age Callovo-Oxfordian Formation in France, the Opalinus Clay in Switzerland and the non-indurated Boom Clay in Belgium (Mazurek, 2004;NWMO, 2011). Among others, key reasons for examining the characteristics of these argillaceous rocks include the ability of such rocks to accommodate deformations without extensive damage and rupture and their inherent self-sealing capacity that enables maintenance of low rock mass permeabilities (Horseman, 2001;Mabmann et al, 2009;Bock et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Isothermal Permeability of the Argillaceous Cobourg Limestone

Selvadurai¹,

Najari²

2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-The paper presents the results of an experimental evaluation of the permeability of the heterogeneous argillaceous limestone from the Cobourg formation located in southern Ontario, Canada. The low permeability of the limestone necessitated the development of experimental techniques for effectively measuring the permeability of the rock. In particular, we examine the results of pressurization of a fluid-filled co-axial cylindrical cavity of finite length cored into a 150 mm diameter cylinder of the Cobourg Limestone. The orientation of the cavity is either normal to or along the nominal stratifications identified by the argillaceous partings separating the quartzitic phases. Both steady state and transient tests are used to estimate the permeability of the Cobourg Limestone. The paper also investigates the influence of a nominal axial load on the permeability of the rock.

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The OECD/NEA Report on Self-sealing of Fractures in Argillaceous Formations in the Context of Geological Disposal of Radioactive Waste

Cited by 40 publications

References 0 publications

Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland)

Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland)

Report on THMC Modeling of the Near Field Evolution of a Generic Clay Repository: Model Validation and Demonstration

Isothermal Permeability of the Argillaceous Cobourg Limestone

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