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UID:21@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20250320T130000
DTEND;TZID=Europe/Paris:20250320T140000
DTSTAMP:20250318T155538Z
URL:https://osups.universite-paris-saclay.fr/calendrier/structural-inherit
 ance-and-hydrothermal-alteration-impact-on-fluid-circulation-in-a-clay-ric
 h-shear-zone-the-schauinsland-mine-as-a-geothermal-analogue/
SUMMARY:Structural inheritance and hydrothermal alteration impact on fluid 
 circulation in a clay-rich shear zone – The Schauinsland mine as a geoth
 ermal analogue
DESCRIPTION:par Benjamin Avakian\n\nLe séminaire aura lieu en salle de con
 férences au 2ème étage du bâtiment 504.\nRésumé : \nDeep geothermal
  power plants in the Upper Rhine Graben (URG) harness natural hot brines c
 irculating within the fracture network of basement rocks. The nature and g
 eometry of the fault network must be documented in detail to reduce the ri
 sk of targeting low-permeability structures during drilling. Fault zones a
 nd associated fracture networks exhibit variable hydraulic properties depe
 nding on the nature of their deformation\, hydro­ thermal alteration\, an
 d mineral infills. The Schauinsland mine\, located on the eastern shoulder
  of the URG\, is considered an analogue for exploited geothermal basement 
 reservoirs. It provides a 3D exposure of a clay-rich shear zone and a perp
 endicular ore vein\, analogous to present-day brine circulation pathway en
 countering a heterogeneously permeable structure. Petrophysical\, petrogra
 phical\, mineralogical and geochemical in­ vestigations of this shear zon
 e offer the opportunity to reconstruct its formation and the associated fl
 uid path­ ways. A statistical analysis of the dataset was carried out to 
 highlight correlations between deformation and hydrothermal alteration pro
 cesses. Through repeated seismic cycles\, the core zone shifted from a con
 duit to a barrier for fluid circulation\, due to the precipitation of seco
 ndary minerals within the remaining open spaces\, resulting in a multi-cor
 e structure. Observations show that the damage zones within the transition
  zone of the shear zone likely constitute the optimal zone for present-day
  fluid circulation.
CATEGORIES:Séminaires
LOCATION:GEOPS\, Bât. 504 Rue du Belvédère\, Orsay\, 91400\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât. 504 Rue du Belvédèr
 e\, Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=GEOPS:geo:0,0
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DTSTART:20241027T020000
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