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| Titel |
COTHERM: Numerical modeling of the deep roots of volcanic geothermal systems |
| VerfasserIn |
Samuel Scott, Philipp Weis, Thomas Driesner |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096423
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| Publikation (Nr.) |
 EGU/EGU2014-11929.pdf |
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| Zusammenfassung |
| We report numerical simulations of the transient evolution of fluid flow and heat transport in
high-enthalpy geothermal systems around cooling intrusions, including the deep,
‘supercritical’ roots. We employ the CSMP++ fluid flow and heat transport code, and analyze
the temperature, pressure, phase state distribution etc. during the whole lifetime of a
geothermal system. Such simulations are of high relevance to projects like the Iceland Deep
Drilling Project, which aim to dramatically improve the economics of geothermal
power production by tapping such ‘supercritical’ reservoirs. We study the effects
of the depth of the intrusion, the system-scale permeability and the permeability
change across the brittle-ductile transition. While previous studies have commonly
adopted a temperature-dependent parameterization, with permeability decreasing in
a log-linear fashion at temperatures above 360°C, this study explores a variety
of different potential temperature dependencies of permeability and their effects
on model results. These effects are large and namely affect the thickness of the
conductive boundary layer, which impacts the overall rate of cooling of the intrusion. |
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