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

<div>T logs obtained from well GRT-1 during production (Jan 2013, airlift production), at thermal equilibrium prestimulation (Apr 2013, four months after hydraulic tests) and poststimulation (Dec 2013, five months after hydraulic stimulation). Dotted lines indicate the gradient of the T logs during production (red) and poststimulation (purple). T anomalies are associated with open fractures observed in acoustic image logs at (a) 2236 m MD, (b) 2345 m MD, and (c) 2368 m MD. Arrows indicate inflows of geothermal water through fractures. Depth is expressed in MD. T logs and flow logs were shifted manually to match anomalies with fracture zones.</div>

Geofluids

fig8

Figure 8

Figure 8: 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 8 | 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 