Porosity network and transfer properties of geothermal formation :Importance of damage zones around faults and fractures

Géraud Yves, Rosener Michel, Place Joachim

Institut de Physique du Globe de Strasbourg Equipe de Physique des matériauxUMR 7516, Université Louis Pasteur-CNRS

Strain and rheology of fracture and fault zones

Petrophysical data

GeologyPetrographyMineralogystructure

PorosityPermeabilityThermal conductivity

Strain StressTemperature time

Intrinsic properties

Rheologic modelTHM Code_bright

PYGARKI Fault

Hanging wall

Gouge or cataclasites

Transport through Soultz/forêts granite

Mass fluxes Fluid fluxes Thermal fluxes

CalciteQuartz

Illite

-40

-30

-20

-10

0

10

20

30

40

50

60

0.25 0.5 0.75 1 1.25 1.5 1.75Facteur de volume

Gains et pertes (en g/ 100 g de biotite)

SiO2 Al2O3 FeO MnO TiO2 MgO K2O Na2O CaO CO2 H2O

isochimique

isovolumique

From mineralogical and geochemical analysis

Physico-chemical model of transport

Rh : 10-12 m

Rh : 10-14 m

K109

2.56 W/mK

1,8

2

2,2

2,4

2,6

2,8

3

From the sample to the mineral scale

Thermalconductivity by optical scanning

X-ray tomodensitometry

Transport through Soultz/forêts granite

Experimental and numerical model of the fluid-rock interaction around a fracture

Fracture

Granit with damage zone

Fluid flow

Mass flux measurementThermal flux measurment

Experimental tests under X-ray tomodensitometryNumerical tests under kindis, Kirmat and Code bright models

L ’ oligo-miocen to actual extension W Europe, France- Spain

Actual extension : East Europ, Greece Turkey

Area of investigation