Research Article

How Can Temperature Logs Help Identify Permeable Fractures and Define a Conceptual Model of Fluid Circulation? An Example from Deep Geothermal Wells in the Upper Rhine Graben

Figure 2

T logs from the granitic basement at thermal equilibrium in GPK-1 (Mar 1993, five months after the last hydraulic tests). T anomalies are associated with the permeable FZs observed in the image logs. The structural data of these FZs are presented in Table 1. Depth is expressed in Measured Depth (MD). T logs and flow logs were shifted manually to fit the anomalies with the fracture zones. Petrographic results are from Genter and Traineau [38]. Schmidt diagrams (lower hemisphere) and the cumulative number of fractures in the granitic basement are from Genter et al. [35].