How Do Secondary Minerals in Granite Help Distinguish Paleo- from Present-Day Permeable Fracture Zones? Joint Interpretation of SWIR Spectroscopy and Geophysical Logs in the Geothermal Wells of Northern Alsace

<div>Correlation of the SWIR water and 2200 nm absorption band area for (a) the GRT-2 and GPK-1 wells, (b) XRD results for the slightly altered granite and the hydrothermally altered granite in the GRT-2 well, and (c) XRD results for the unaltered granite and the hydrothermally altered granite in the GPK-1 well.</div>

Geofluids

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Figure 9

Figure 9: How Do Secondary Minerals in Granite Help Distinguish Paleo- from Present-Day Permeable Fracture Zones? Joint Interpretation of SWIR Spectroscopy and Geophysical Logs in the Geothermal Wells of Northern Alsace 

Figure 9 | How Do Secondary Minerals in Granite Help Distinguish Paleo- from Present-Day Permeable Fracture Zones? Joint Interpretation of SWIR Spectroscopy and Geophysical Logs in the Geothermal Wells of Northern Alsace 