 Deep
Geothermal Resources
(CLOSED 7 SEPTEMBER 2006)
Operating Agent:
Forschungszentrum Jülich
GmbH, Germany
Task Leader:
Dieter Rathjen
Forschungszentrum Jülich GmbH
Division Renewable Energies
EEN
D-52425
Jülich
Germany
Telephone: +49-2461-61-4233
Fax: +49-2461-61-2840
E-mail: d.rathjen@fz-juelich.de
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Closure Note: The work of this Annex is very closely related to that of Annex III (EGS) because enhanced geothermal systems studies are being pursued in several regions where the desired high temperatures are reached at much greater depths (> 4,000 m) than in the “normal” high-temperature geothermal fields. In addition, to access deep geothermal resources requires drilling to depths > 3,000 m, i.e. “deep” drilling. Consequently, some of the Annex IV projects have “crossed-over” into Annexes III and VII; with the effect that Annex IV’s activities declined as those in Annex III and VII grew. As a result, the ExCo decided at its 16th Meeting on 7-8 September 2006 that since 2006 was the last year of the Annex’s current term, it was appropriate to close it and transfer the remaining investigations appropriately into Annexes III and VII.
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The objective of the Deep Geothermal Resources Annex is to address
the issues necessary for the commercial development of deep geothermal
resources at depths of about 3,000 m and deeper.
The Deep Geothermal Resources Annex was started in 1997 as a four-year
international collaborative program. In 2001, the GIA Executive
Committee approved the continuation of this Annex through 2006.
The Australian, EC Soultz and German projects included in this
Annex also involve the “creation” of geothermal reservoirs
at depths much greater than 3,000 m, i.e. the application of EGS
to create deep geothermal resources. Consequently, their work spans
both Annex III- EGS and Annex IV- Deep Geothermal Resources. The
Executive Committee is in the process of sorting out this “overlap”
of Annex III and Annex IV projects.
The participants in Annex IV during 2006 were: Germany, Mexico, Geodynamics, Green Rock Energy and ORMAT Technologies.
Annex IV is divided into three Subtasks.
Subtask A- Exploration Technology and Reservoir Engineering
The objective of Subtask A is to carry out collaborative research
on exploration technology, including geothermal modelling; geophysical,
geological and geochemical exploration; and on reservoir engineering,
including reservoir characterization and reservoir modelling.
Subtask B- Drilling and Logging Technology
The objective of Subtask B is to carry out collaborative research
on drilling and logging technologies, including the reviews of drilling
and logging reports of deep geothermal wells; and exchange of information
on improvements in drilling and logging tools.
Subtask C- Reservoir Evaluation
Subtask C seeks to exchange experience on materials and chemistries
among the group. Published and unpublished information is gathered
on past, present and planned experiences, and tests and research
on materials in deep and aggressive geothermal systems. The information
is then summarized in a database.
Highlights and Outputs of Annex IV
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