Mineralogy, porosity permeability and thermal conductivity are mean parameters of the 
material that control fluid rock interaction processes like dissolution, fracturation or 
cementation processes. They could influence drastically the fluid pathway within the 
geothermal exchanger. In the aim to constrain these factors we propose, using the optical 
scanning technology developed by Pr Y. Popov, a set of maps linking them.  Different kinds of 
structures are sampled from a low strained matrix to damage zone and core of fault zones. 
These maps point out  the importance of the altered plagioclase forming a network within the 
matrix and K-feldspar had low porosity an thermal conductivity value and decrease the flow of 
fluid and heat through the material. Quartz cemented fractures are generally high porous and 
thermal conductivity pathway.

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