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 6

Stereoplot of the permeable fractures identified in acoustic image logs from GPK-1 (circle), GRT-1 (triangle), and GRT-2 (square). Blue symbols indicate fractures associated with negative anomalies, and red symbols indicate positive anomalies. Orientations and dips are detailed in Table 1. The maximum horizontal stress is from [56] for Soultz and from [57] for Rittershoffen.