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Characterization and modeling of natural tracers' transfers through the argillites of Tournemire (France); Caracterisation et modelisation des transferts de traceurs naturels dans les argilites de Tournemire

Abstract

The French Institute for Protection and Nuclear Safety (IPSN) is investigating the argillaceous formation of Tournemire (France) as a methodological underground laboratory for conducting research on the feasibility of deep geological repositories for radioactive waste in argilites. Because of the very low water content and hydraulic conductivity of the argilites, the migration through this media should be very low. The fluid flow regime and transport have been studied using natural tracers from the interstitial water. The deuterium and chloride of interstitial water have been chosen for their conservative behavior. After the development of a protocol for the chloride extraction from the water, and tests on the vacuum distillation method for the water extraction from the rock, systematic data acquisition has been performed on the argillaceous sequence of the massif and near the fracture areas. Both chloride and deuterium profiles suggest that transfers are mainly diffusive at the massif scale. But the profiles show an enrichment in delta D and delta {sup 18}O of the interstitial solution in the area of one meter adjacent to a fracture compared to pore water of samples located at further distance. Therefore, these observations are suggesting that a second process could generate specific transfers, at  More>>
Authors:
Publication Date:
Sep 13, 2001
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-5331
Resource Relation:
Other Information: TH: These hydrologie et hydrogeologie quantitatives; 140 refs; PBD: 13 Sep 2001
Subject:
58 GEOSCIENCES; ARGILLITE; CHLORIDES; CLAYS; DEUTERIUM; DIFFUSION; FLOW MODELS; GEOLOGIC FRACTURES; GEOLOGIC MODELS; INTERSTITIAL WATER; PRESSURE DEPENDENCE; RADIOACTIVE WASTE DISPOSAL; RADIONUCLIDE MIGRATION; TRACER TECHNIQUES; ULTRAFILTRATION
OSTI ID:
20386533
Research Organizations:
Ecole des Mines de Paris, 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0303216066603
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[260] pages
Announcement Date:

Citation Formats

Patriarche, D. Characterization and modeling of natural tracers' transfers through the argillites of Tournemire (France); Caracterisation et modelisation des transferts de traceurs naturels dans les argilites de Tournemire. France: N. p., 2001. Web.
Patriarche, D. Characterization and modeling of natural tracers' transfers through the argillites of Tournemire (France); Caracterisation et modelisation des transferts de traceurs naturels dans les argilites de Tournemire. France.
Patriarche, D. 2001. "Characterization and modeling of natural tracers' transfers through the argillites of Tournemire (France); Caracterisation et modelisation des transferts de traceurs naturels dans les argilites de Tournemire." France.
@misc{etde_20386533,
title = {Characterization and modeling of natural tracers' transfers through the argillites of Tournemire (France); Caracterisation et modelisation des transferts de traceurs naturels dans les argilites de Tournemire}
author = {Patriarche, D}
abstractNote = {The French Institute for Protection and Nuclear Safety (IPSN) is investigating the argillaceous formation of Tournemire (France) as a methodological underground laboratory for conducting research on the feasibility of deep geological repositories for radioactive waste in argilites. Because of the very low water content and hydraulic conductivity of the argilites, the migration through this media should be very low. The fluid flow regime and transport have been studied using natural tracers from the interstitial water. The deuterium and chloride of interstitial water have been chosen for their conservative behavior. After the development of a protocol for the chloride extraction from the water, and tests on the vacuum distillation method for the water extraction from the rock, systematic data acquisition has been performed on the argillaceous sequence of the massif and near the fracture areas. Both chloride and deuterium profiles suggest that transfers are mainly diffusive at the massif scale. But the profiles show an enrichment in delta D and delta {sup 18}O of the interstitial solution in the area of one meter adjacent to a fracture compared to pore water of samples located at further distance. Therefore, these observations are suggesting that a second process could generate specific transfers, at the vicinity of faults. The hypothesis of the molecular diffusion as a dominant process for transport was successfully tested using a transport model, over periods of several tenth of millions years, taking into account geodynamical features of the region (such as tectonic and induced faults), and assuming that some variations of the tracer concentrations at the system boundaries occurred during the major climate-change periods. Even if tracers' transfers are mainly diffusive at the massif scale, they are or should have been affected by a second process causing heterogeneity of concentrations at the vicinity of faults. This process involves either, intrusion of salted solutions or internal transfers due to overpressures. (author)}
place = {France}
year = {2001}
month = {Sep}
}