Fracturation héritée et induite à partir d'images acoustiques et électriques de paroi

Chrystel Dezayes (1) , Albert Genter (1) , Thierry Villemin (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 LGCA - Laboratoire de Géodynamique des Chaines Alpines

In the framework of a European Geothermal Project, three boreholes were drilled at Soultz-sous-Forêts, Rhinegraben, which reached the hot and fractured granitic basement. Fresh water will be injected intot one borehole, an d revovered hot from the other. To designs this reservoir, a knowledge of both the paleo-fracture pattern in the granite ant the orientation of the present-day stress field is required. Fracture analysis was carried out on borehole images coming from different boreholes. Two types of logging tools were used to product these images: acoustic tools (BHTV, UBI) and electric tools (FMI, FMS). Fractures observed have two origins: pre-existing fracture and induced fractures.

Mots clés: acoustic logging; electric logging; fractures; granite; geothermal reservoirs; hot dry rocks; natural fractures; induced fractures; Bas-Rhin; Soulz-sous-Forêts

Domaines: Sciences de la Terre

Chrystel Dezayes, Albert Genter, Thierry Villemin. Fracturation héritée et induite à partir d'images acoustiques et électriques de paroi. Bulletin des centres de recherches exploration-production Elf-Aquitaine, 1996, 20 (1), pp.197-212. ⟨hal-03997045⟩