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>Complexity of a FZ after Caine et al. [<a href="/journals/geofluids/2019/8231816/#B71">71</a>]. We can differentiate three zones: (a) the fault core, which can be a pathway for fluid if illite and quartz veins are not totally sealing the zone, (b) the damage zone, which can be sealed or opened with fractures that are acting as fluid pathways, and (c) the unaltered granite, which shows generally very low permeability.</div>

Geofluids

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Figure 1: 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 1 | 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 