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Mid-Term Conference - Potsdam, Germany
Mid-Term Conference - Potsdam, Germany
9-12 January 2007 GeoForschungsZentrum Potsdam
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How geology can contribute to improve the knowledge of EGS fields in Europe?
Geological investigations are extensively used in all phases
of exploration of 
EGS fields. At large scale, geological key elements for the
geothermal resource 
evaluation include temperature data distribution, field
geology, geological 
mapping, seismic profile interpretation, structural analysis
of large-scale faults 
or volcano-tectonic structures.

During the drilling exploration phase, a lot of geological
data are acquired in 
order to characterize the deep lithology, the fracture
system organisation, and 
some information about the present-day stress field. The
knowledge of the 
reservoir composition (lithology, mineralogy) is derived
from drilling data such as 
core samples, cuttings, and various geophysical loggings.
The detailed chemical 
and mineralogical composition of the hosted rocks and
hydrothermal alteration 
is investigated from petrographical studies (thin sections,
X-ray, dating).

The knowledge of the fracture system during the phase of
reconnaissance is mainly based on core data and borehole
imagery logs. 
Additional information about the fracture system could
derive from classical 
geophysical logs. Moreover, the fluid flow characterisation
of the permeable 
fractures is deduced from temperature and flow logs. 

Compilation and interpretation of geological and geophysical
data obtained in 
the different phases of the EGS exploration conduct to
conceptual models which 
could be modelled in 3D for a better understanding of fluid
flow circulation and 
heat exchange.

Based on the Soultz experience, the main needs identified
are related to the 
lack of information about the fracture extension in 3D and
the difficulty for 
characterizing crystalline altered rocks at great depth. In
order to fill these 
gaps, fracture mapping on well-exposed analogues,
geophysical methods such 
as vertical seismic profiles (VSP) or new high resolution
geophysical logging 
techniques run in the boreholes could improve significantly
the image of EGS 
Id: 51
Place: GeoForschungsZentrum Potsdam
14473 Potsdam
Room: Building H, auditorium and seminar rooms
Starting date:
12-Jan-2007   09:15
Duration: 15'
Primary Authors: Dr. GENTER, Albert (BRGM)
Co-Authors: Dr. DEZAYES, Chrystel (BRGM)
Dr. SAUSSE, Judith (Nancy University)
Presenters: Dr. GENTER, Albert
Material: slides Slides

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