Mass Transfer & Porous Media (MTPM) - Andra

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P/MTPM/41Figure 1: Thermal conductivity mapping of samples showing a diagenetic control. Upper part, sectionperpendicular to the bedding (dashed line); yellow to red : calcite cement. Lower part, section parallel tobedding; some variation of the thermal conductivity is observed, between 1.2 (in blue) and 2 W.m -1 .K -1 (ingreen). Using both sections an anisotropy tensor could be reconstructed with a lower value perpendicularto the K 1 axis of the magnetic anisotropy.Figure 2: TC profiles obtained from thesame core drilled at the wall of theunderground laboratory. The low TCzone (between 0.5 and 1 W.m -1 .K -1 ) atthe beginning of profile 1 cor-respondsto the high porosity of a damaged zone.At the end of profile 2 the high TC valueis due to pyrite grains and the low TCvalues correspond to the high porosityalteration zones sur-rounding the grainsof pyrite.ReferencesEsteban, L., Géraud, Y. and Bouchez, J.L., 2006. Pore network connectivity in Jurassic argillitespecimens from eastern Paris Basin (France). J. Physics & Chemistry Earth , doi : 10.1016/j.pce.2005.11.001 .Esteban, L., Géraud, Y. and Bouchez, J.L., 2006. Pore network connectivity in low permeabilitysediments from magnetic fabric data and oriented mercury injections. Geophysical ResearchLetters, L18311, doi :10.1029/2006GL026908 .Popov, Y.A., Pribnow, D.F.C., Sass, J.H., Williams, C.F. and Burkhardt, H., 1999. Characterization of rockthermal conductivity by high-resolution optical scanning. Geothermics, 28: 253-276.Page 504INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENT
P/MTPM/42POROSITY NETWORK GEOMETRYAND INFERRED PERMEABITYOF THE CALLOVO-OXFORDIAN ARGILITESFROM MAGNETIC FABRICAND ORIENTED MERCURY INJECTIONSY. Géraud 1 , L. Esteban 1, 2, 3, 4 , J-L Bouchez 2 , A. Trouiller 31. Institut de physique du globe de Strasbourg, UMR 7516, Université Louis Pasteur-CNRS, 1 rueBlessig, F-67089 Strasbourg cedex ( ygeraud@illite.u-strasbg.fr )2. Univ. Toulouse, 14 Ave E. Belin, 31 400-Toulouse and GdR CNRS FORPRObouchez@lmtg.obs-mip.fr3. Andra, Parc de la Croix Blanche, 1-7 rue J. Monnet, 32290-Châtenay-Malabry(alain.trouiller@andra.fr)4. Now at Geological Survey of Canada-Pacific, 9860 West Saanich Road, Sidney, B.C., Canada,V8L 4B2 (lesteban@nrcan.gc.ca)INTRODUCTIONThe Jurassic in age, ~ 130 m thick, gray-coloured and homogeneous argillites that host the Andralaboratory, are a mix of clay minerals (~ 50%), carbonates (~ 25%) and silts (~ 25%). These argillites havebeen collected at depth (~ 490 m) by Andra. From a palaeo-climatological point of view, these argiliteswere deposited during a cold event that lasted ~ 4 Ma within a globally warm period marked by thecarbonate platforms at the base and top of the argillitic formation. In the aim to investigate transferproperties of the material, specimens of the three main lithologies (silty, carbonate and clayey materials)are submitted to a set of combined analyses using magnetic anisotropy axis determination, mercuryinjection and ferro-fluid saturation. These data are used in a numerical model to infer permeability.PORE STRUCTUREThe preliminary magnetic anisotropy measurements point out a specific orientation of the main magneticaxis depending on the lithology and are strongly controlled by the mineral fabric (Figure 1). Along theFigure 1: Sructure parameter obtained by ASMand mercury injection. K1, K2, K3 are mainmagnetic axis (see Bouchez et al. this volume)used for mercury injection (right). Left, ASMorientation after ferro-fluid injection for increasingpressure ( 4, 8, 14 and 70MPa), the initialorientation is supported by mineral orientation inblack, (Esteban et al., 2006a, .Esteban et al., 2007)INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENTPage 505
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Poster [MTPM]Mass Transfer & Porous
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P/MTPM/1The free energy cost of for
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P/MTPM/3DIFFUSION OF IONS IN UNSATU
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P/MTPM/4POROUS MEDIA CHARACTERIZATI
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P/MTPM/5Oxalate ionsQuartzQuartz +P
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P/MTPM/6borehole was capped with a
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P/MTPM/7Initial state with glass an
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P/MTPM/8The mesh of the elementary
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P/MTPM/9Moreover, using another sam
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P/MTPM/10Figure 1: Horizontal cross
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P/MTPM/11n t (mol)as received8 10 -
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P/MTPM/1210,9Degree of saturation (
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P/MTPM/13RESULTSFirst, we estimated
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P/MTPM/142.5Energy (M eV)1.6 1.7 1.
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P/MTPM/15C/Co10.90.80.70.60.50.40.3
Page 34 and 35: P/MTPM/16ModelIrmayvG-M1vG-M2vG-M3T
Page 36 and 37: P/MTPM/17Figure 1: Experimental HTO
Page 38 and 39: P/MTPM/18Diffusion experiments were
Page 40 and 41: P/MTPM/19Figure 1: Used mesh for co
Page 42 and 43: P/MTPM/201.81.61.41.2upstream compa
Page 44 and 45: P/MTPM/21490Pressure [bar]0 10 20 3
Page 46 and 47: 134P/MTPM/22through-diffusion exper
Page 48 and 49: P/MTPM/23HA (µg/g)3002001000(a):pH
Page 50 and 51: P/MTPM/24through each sample. The p
Page 52 and 53: P/MTPM/25FIRST RESULTSPreliminary c
Page 54 and 55: P/MTPM/26heterogeneous distribution
Page 56 and 57: P/MTPM/27Relative concentration (C-
Page 58 and 59: P/MTPM/280.75m0.25mTable 1: Cross s
Page 60 and 61: P/MTPM/29Figure 1: A. Scheme of the
Page 62 and 63: P/MTPM/30The presented theory is ex
Page 64 and 65: P/MTPM/31Furthermore, Van Loon et a
Page 66 and 67: P/MTPM/32RESULTSResults show that,
Page 68 and 69: P/MTPM/33Clay modellingPore size di
Page 70 and 71: P/MTPM/341.60E-11f H2-d total (kg.m
Page 72 and 73: P/MTPM/350.50η R ()0.400.300.200.1
Page 74 and 75: P/MTPM/36200Bq/g1801601401201008060
Page 76 and 77: P/MTPM/37Argilite (ionic strength 0
Page 78 and 79: P/MTPM/38-Samples cored at 12m were
Page 80 and 81: P/MTPM/39APPLICATIONSCORE 2D has be
Page 82 and 83: P/MTPM/40Figure 1: Sketch drawing o
Page 86 and 87: P/MTPM/42Figure 2: Model of pore st
Page 88 and 89: P/MTPM/43The available data are con
Page 90 and 91: P/MTPM/44Figure 1: Spatial extensio
Page 92 and 93: P/MTPM/45Relative concentration / (
Page 94 and 95: P/MTPM/46Figure 2: Swelling pressur
Page 96 and 97: P/MTPM/47then used in the transport
Page 98: P/MTPM/4820181614121086Gas pressure
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Mass Transfer & Porous Media (MTPM) - Andra

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