Thermal conductivity of alluvial sediments from the Ness Formation, Oseberg Area, North Sea

Midttømme, Kirsti; Roaldset, E.; Brantjes, Jeroen

doi:10.3997/2214-4609.201409129

Cited by 2 publications

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“…In those simulations, adopting values of thermal conductivities equal to 1.65 W/(m·K) and 1.31 W/(m·K) for the directions parallel and perpendicular to the Applied Clay Science xxx (2014) xxx-xxx bedding plane, respectively, led to good agreement with the measured temperatures. It is worth noting that, in some sedimentary rocks, the thermal conductivity in the direction parallel to the bedding plane is more than twice higher than that in the direction perpendicular to the bedding plane (Midttømme et al, 1996). After Schön (1996), the reasons for this anisotropy in thermal conductivity of sedimentary rocks are: (i) crystal anisotropy of the individual rock-forming minerals; (ii) intrinsic or structural anisotropy resulting from the mineral shapes and their textural arrangement within the rock; (iii) orientation and geometry of crack fractures and other defects.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic thermal conductivity of natural Boom Clay

Dao

Delage

Tang

et al. 2014

Applied Clay Science

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The thermal conductivity of host rocks is an important parameter in the design of deep geological disposal of heat-emitting radioactive waste. Due to bedding, heat transfer in sedimentary rocks is affected by their transversally isotropic structure. In this work, an experimental program is run to measure the thermal conductivities of Boom Clay along various orientations with respect to the bedding plane by using the needle thermal probe technique. Measurements were performed on specimens obtained from cores drilled from the HADES Underground Research Laboratory (URL) at Mol, Belgium, at a depth of 223 m. The thermal conductivity values obtained are in good agreement with those previously published, confirming the thermal anisotropy of Boom Clay. Moreover, the observed changes in thermal conductivity with respect to the distance to the gallery provide further evidence on the extent of the Excavation Damaged Zone around the gallery.

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Section: Introductionmentioning

confidence: 99%

Anisotropic thermal conductivity of natural Boom Clay

Dao

Delage

Tang

et al. 2014

Applied Clay Science

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Thermal conductivity of sedimentary rocks: uncertainties in measurement and modelling

Midttømme

Roaldset

1999

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In spite of the fact that thermal conductivity is a key factor in basin modelling, knowledge regarding the thermal conductivity of sedimentary rocks is scarce. In particular, hardly any information exists about claystones and mudstones which can make up 70-80% of a sedimentary basin. For the Upper Jurassic sediments of a section across the northern North Sea, basin modelling programs, using the geometric mean model, gave a deviation of 50~ for the present-day temperature, simply because the matrix conductivity was estimated by two different models. These uncertainties in the determination of thermal conductivities are partly due to problems in measuring, and partly to difficulties in modelling the thermal conductivity. Future work should concentrate on comparative studies and tests on all types of sedimentary rocks, directed towards improved measurement methods. This is of particular importance for clays, mudstones and shales, as measurements on these are associated with the greatest uncertainties. Standardized procedures that include detailed descriptions of sampling, sample preparation and measurement techniques are important to ensure that the thermal conductivity measured is unaffected by factors related to the measurement method. In thermal conductivity modelling it is our experience that the influence of sediment texture is underestimated by most models currently applied. Estimates based on the geometric mean model seem to be most reliable when the determination of matrix conductivity is restricted to the sediment type, mineralogy and texture of the sediments.

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Thermal conductivity of alluvial sediments from the Ness Formation, Oseberg Area, North Sea

Cited by 2 publications

References 0 publications

Anisotropic thermal conductivity of natural Boom Clay

Anisotropic thermal conductivity of natural Boom Clay

Thermal conductivity of sedimentary rocks: uncertainties in measurement and modelling

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