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The aim of this research work was to develop geophysical tools and methods for fracture description in hard rock (granite and schists) covering the penetration depth range from tens of centimetres to tens of metres. In addition, the fracture network between two boreholes was studied. The borehole wall imaging probe ELIAS for slimhole conditions was completed. It yielded high quality images for use in structure analysis. The combined use of the induction tools ROMULUS, ERIC and ARLETT made possible an extensive study of schists, with the penetration range 10 cm to 10 m. Data interpretation yields a quantitative description of fractures. The 3-axis ARLETT probe could not be completed in time, but the 1-axis version is available, as well as all data needed for 3-axis interpretation. In replacement, the crosshole electrical tomography method has been improved and simplified. Interesting results have been obtained in a comparison with crosshole hydraulic tests.

Additional information

Authors: POTTECHER G, BRGM, Orléans (FR);STRAUB A, BRGM, Orléans (FR);VALLA P, BRGM, Orléans (FR)
Bibliographic Reference: EUR 14757 FR (1992) 125 pp., MF, ECU 8
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