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Bulletin de la Societe Geologique de France; July 2006; v. 177; no. 4; p. 203-213; DOI: 10.2113/gssgfbull.177.4.203
© 2006 Societe Geologique de France
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Faults and matrix deformations in chalk: contribution of porosity and sonic wave velocity measurements

Christian Schroeder1, Patrick Gaviglio2, Françoise Bergerat3, Sara Vandycke4 and Michel Coulon5

1 GEOMAC, Université de Liège, Chemin des Chevreuils, 1, B52/3, 4000 Liège; ULB, Lab. Jacques Verdeyen, av. Roosevelt, 1050 Bruxelles; UCL, Dept Génie Civil & Environnement, 1459 Louvain-La-Neuve, Belgique (Christian.Schroeder{at}ulg.ac.be)
2 EA 2642 Géosciences, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon cedex; IUFM, Fort Griffon, 25042 Besançon cedex, France (patrick.gaviglio{at}fcomte.iufm.fr)
3 Laboratoire de Tectonique, CEPAGE, Université Pierre et Marie Curie, UMR 7072-FR 32 CNRS-UPMC, case 117, 4 place Jussieu, 75252 Paris cedex 05, France (bergerat{at}ccr.jussieu.fr)
4 FNRS, Faculté Polytechnique de Mons, Géologie Fondamentale et Appliquée, 9 rue de Houdain, 7000 Mons, Belgique (Sara.Vandycke{at}fpms.ac.be)
5 Laboratoire des Sciences de la Terre, CRA, 2, esplanade Roland Garros, 51100 Reims, France (michel.coulon{at}univ-reims.fr)

Measurements of sonic wave velocity and of porosity have been carried out on the Campanian so-called "craie blanche" (white chalk) of the Mons Basin. They have been made on cores collected perpendicular to normal fault planes, at different distances, between 0 (fault plane) and 30 cm. The applications of the continuity index, deduced from the sonic velocity, to these measurements allow us to estimate the amount of microcracking. A new evaluation of the used coefficients, after the physical characteristics of the intact material, has been necessary. The systematic comparison of the values of both velocity and porosity highlight the matrix transformations (decreasing of porosity by calcitic cementation) in a narrow band of about 10 cm on both sides of the fault planes. Depending on the stratigraphic level, the porosity of the intact chalk ranges between 40 and 44% and the sonic wave velocity between 2300 and 2600 m/s. Close to the fault planes, the porosity is about 30 to 35% and the sonic wave velocity about 2700 to 2900 m/s. Along the fault planes, the rock material has an anisotropic behaviour, due to both vertical tectonic microcracking and calcitic barriers resulting from cementation.

Key Words: Sonic wave • Porosity • Chalk • Fault • Cementation • Anisotropy • Microcracks






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