by Joachim Place, Edouard Le Garzic, Yves Geraud, Marc Diraison (EOST,
Strasbourg, France)
Charles Naville (IFP, Paris, France)
André Gérard (EEIG, Soultz-sous-Forêts, France)
Rosa Maria Sanchez, Albert Casas (UB, Barcelona, Spain)
At Soultz-sous-Forêts geothermal site, the fluid flow paths between the
injection and the production boreholes are mainly composed by a set of
permeable structures, occuring from the hectometric to micrometric scales. The
objective of our work is to define the architecture of these paths within the
heat exchanger, which is difficult due to the great depth of the hot granite.
Thus we will expose the present day development of our work organised in two
different domains:
First, an outcropping batholith located in Catalunya presenting strong
analogies with the geothermal reservoir in Soultz-sous-Forêts is studied. The
preliminary results of a detailed fracturation analysis will be presented. A
special attention is paid to fault zones, studied at different scales (from
decimeter to centimeter), thus enhancing different fracturation domains (fault
core, damaged zone, protolith) resulting in diffferent behaviour regarding fluid
flow for geothermal exploitation.
Second, the large VSP survey carried out at Soultz-sous-Forêts in March-April
will be presented "in live". The objectives of this acquisition will be detailed (in
particular, the sensitivity of the downhole tools to temperature and hard other
conditions could be emphasised), and the latest news from the field work will
be given...
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