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Porosity microstructures of a sandstone affected by a normal fault.

FABRICE SURMA*, YVES GERAUD*, LAURENT POURCELOT**, FRANÇOIS GAUTHIER-LAFAYE* JEAN BAPTISTE CLAVAUD***, MARIA ZAMORA***, MARC LESPINASSE**** et MICHEL CATHELINEAU****

 

Bull. Soc. géol. Fr., 2003, t. 174, no 3, pp. 295-303

Document type > *Article de revue

Keywords > chemistry, geology, permeability, rift/fault

Research Unit > IRSN/DEI/SESURE/LERCM

Authors > POURCELOT Laurent

Publication Date > 03/09/2003

Summary

  Normal faults are part of the elements that control fluid flows in sedimentary basins. They can play the role of a barrier or a drain [Hippler, 1993]. These pathways are anisotropic. The aim of this study is to determine the fluid pathways and to characterise the pore network and its role in the transfer properties.

Petrophysics, petrographics, geochemical and fluid inclusion studies allow us to characterise a Buntsandstein sandstone affected by a normal fault. This sandstone has a fluviatile origin, field evidenced by fluviatile channels, but also by some clay layers. The fault is located in the north east of France, in the Rhine Graben. The vertical displacement is about 3 meters, and the dip is 70° east. The fractured zone is composed of three compartments (the hanging wall and the footwall separated by a gouge) divided by these main faults (fig. 1). Oriented samples were taken from the three blocks and were studied following_the procedure figure 2.

*Université Louis Pasteur, Ecole et Observatoire des Sciences de la Terre, Centre de Géochimie de la Surface, 1 rue Blessig, F-67084 Strasbourg cedex, France.

** Institut de radioprotection et de sûreté nucléaire, Bat 153. CEN-CEA Cadarache 13108 St Paul-Les-Durance cedex, France.

*** IPGP Département des Géomatériaux, T 15-14 E3, 4 place Jussieu 75252 Paris cedex, France.

**** Université Henri Poincaré Nancy 1, Faculté des Sciences, « Géosciences », UNIR 7566 G2R « Géologie et Gestion des Ressources Minérales et Energéti­ques », BP 239, Bd des Aiguillettes, 54506 Vandoeuvre-Les-Nancy cedex, France.


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