Résumé
Study of geological reservoirs and is a major issue for a rational and sustainable exploitation ofunderground resources (water, oil, gas ...). In order to estimate and take advantage of thoseresources, it is necessary to assess the intrinsic properties of the reservoir, such as their porosity andpermeability. The latter is dependent of bedrock heterogeneity due to a variable sedimentation (e.gsedimentary lamination, cross-bedded sediments, matrix heterogeneities) or to the presence offractures or faults. Theses heterogeneities can lead to anisotropic permeability properties that havebeen poorly studied. To characterize this anisotropy and assess a permeability tensor, manymodeling approaches have been proposed but few studies propose to assess the permeability tensorof a reservoir block size on the basis of in situ permeability variability measurements. In this study,permeability tensor is determined in homogeneous anisotropic sedimentary environment (rocksamples from late Burdigalian limestones without fractures). Eight cross sections (N, NW, W, ...) wereperformed on these blocks (= cut in to 8 faces), permeability measurements were realized with a fieldminipermeameter (Tiny perm II). The dip of sedimentary layers was measured near to each sampledblock in order to identify possible relationships between the permeability tensor and the depositionalenvironment. Results show a relative consistency between sediment layer dips and orientation ofpermeability tensor.