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Contribution of logging tools to understanding helium porewater data across the Mesozoic sequence of the East of the Paris Basin
Battani A., Smith T., Robinet J.C., Brulhet J., Lavielle B. et al
Geochimica et Cosmochimica Acta 75 (2011) 7566-7584 - http://hal.in2p3.fr/in2p3-00657211
Planète et Univers/Sciences de la Terre/Géochimie
Sciences de l'environnement/Milieux et Changements globaux
Contribution of logging tools to understanding helium porewater data across the Mesozoic sequence of the East of the Paris Basin
A. Battani1, T. Smith1, 2, J.C. Robinet1, J. Brulhet1, B. Lavielle1, 2, D. Coelho1
1 :  ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs
http://www.andra.fr/
ANDRA
ANDRA Parc de la Croix Blanche rue Jean Monnet 92298 Chatenay Malabry France
France
2 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
http://www.cenbg.in2p3.fr/
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
France
RAEN
Helium concentration measurements made on water and rock samples collected at various depths along a 2000 m depth borehole drilled in the eastern part of the Paris basin and reaching the Triassic conglomerates were used to establish a vertical profile of dissolved helium concentration throughout the entire Mesozoic sedimentary pile. Wireline logging tools were used to measure rock density, porosity and U and Th contents every 15 cm in the various formations. Samples from the deepest Muschelkalk and Buntsandstein show a very good agreement between measured and calculated 4He porewater contents. Shallower levels show lower and lower 4He concentrations compared to calculated values when going upwards. The data set obtained by wireline logging measurements was used as inputs for numerical simulations of 1D He production/diffusion throughout the 2000 m profile. Several assumptions regarding the transport properties in the various sedimentary layers were tested and all were found to yield fairly good agreement between modeled and measured He concentrations. There is no need to invoke either a transient regime or a deep crustal He flux in this "quiet" (seismically inactive) part of the Paris basin. Moreover, the modeling results suggest that the Keuper massive halite level associated with the upper Muschelkalk pre-evaporitic series efficiently isolates the overlying layers from any input from deeper formations in the Meuse/Haute Marne area

Articles dans des revues avec comité de lecture
01/12/2011
Geochimica et Cosmochimica Acta
Publisher Elsevier
ISSN 0016-7037 (eISSN : 0016-7037)
75
7566-7584