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Naturally Mineralized Systems and Mineralisations, a natural analogue of Enhanced Geothermal Systems (EGS)? LEDRU Patrick, BOUCHOT Vincent, GENTER Albert ENGINE Workshop Defining, exploring, imaging and assessing reservoirs for potential

SLIDE 1

ENGINE Workshop “Defining, exploring, imaging and assessing reservoirs for potential heat exchange”, GFZ Potsdam (Germany), 6-7 November 2006

Naturally Mineralized Systems and Mineralisations, a natural analogue

f Enhanced Geothermal Systems (EGS)?

LEDRU Patrick, BOUCHOT Vincent, GENTER Albert

SLIDE 2

NMS versus EGS

> Naturally Mineralized Systems (NMS) > Fault/fracture mechanism in the crust > Gold-vein deposits (Australia, Canada,

France, …): natural analogues

> Enhanced Geothermal Systems (EGS) > Reservoir Stimulations > Induced Seismic activity and Permeability > Natural fracture and present-day stress field

SLIDE 3

Fracture zone architecture

McCuaig & Kerrich, 1998 Fracture zone Mineralized deposit Alteration halo Fracture zone organisation at Soultz Genter et al., 2000 3D Fracture distribution at Soultz based on borehole data Quartz veins, Millier & Wilson (2004) Le Châtelet

A N A L O G U E

Gold Mine