Natural State Model of the Nesjavellir Geothermal Field, Iceland
The Nesjavellir geothermal system in southern Iceland is very complex from both a thermal and hydrologic point of view. There are large pressure and temperature gradients in the wellfield and zones with drastically different pressure potentials. Thus, natural fluid flow is substantial in the system...
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ftosti:oai:osti.gov:887106 2023-07-30T04:04:21+02:00 Natural State Model of the Nesjavellir Geothermal Field, Iceland Bodvarsson, G.S. Pruess, K. Stefansson, V. Steingrimsson, B. Bjornsson, S. Gunnarsson, A. Gunnlaugsson, E. 2006-11-06 application/pdf http://www.osti.gov/servlets/purl/887106 https://www.osti.gov/biblio/887106 unknown http://www.osti.gov/servlets/purl/887106 https://www.osti.gov/biblio/887106 15 GEOTHERMAL ENERGY 02 PETROLEUM AQUIFERS DISTRIBUTION ENTHALPY FLUID FLOW GEOTHERMAL FIELDS GEOTHERMAL SYSTEMS HEATING ICELAND PERMEABILITY RESERVOIR ENGINEERING TEMPERATURE DISTRIBUTION TEMPERATURE GRADIENTS 2006 ftosti 2023-07-11T08:43:27Z The Nesjavellir geothermal system in southern Iceland is very complex from both a thermal and hydrologic point of view. There are large pressure and temperature gradients in the wellfield and zones with drastically different pressure potentials. Thus, natural fluid flow is substantial in the system and flow patterns are complex. We have developed a two-dimensional natural state model for the Nesjavellir system that matches reasonably well the observed pressure and temperature distributions. The match with field data has allowed determination of the energy recharge to the system and the permeability distribution. Fluids recharge the system at rate of 0.02 kg/s/m with an enthalpy of 1460 kJ/kg. The permeability in the main reservoir is estimated to be in the range of 1.5 to 2.0 md, which agrees well with injection test results from individual wells. Permeabilities in shallower reservoirs are about an order of magnitude higher. Most of the main reservoir is under twephase conditions, as are shallow aquifers in the southern part of the field. The model results also suggest that the low temperatures in the shallow part of the northern region of the field may be due to the young age of the system; i.e., the system is gradually heating up. If this is the case the estimated age of the system near the wellfield is on the order of a few thousand years. Other/Unknown Material Iceland SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Nesjavellir ENVELOPE(-21.251,-21.251,64.115,64.115) |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
15 GEOTHERMAL ENERGY 02 PETROLEUM AQUIFERS DISTRIBUTION ENTHALPY FLUID FLOW GEOTHERMAL FIELDS GEOTHERMAL SYSTEMS HEATING ICELAND PERMEABILITY RESERVOIR ENGINEERING TEMPERATURE DISTRIBUTION TEMPERATURE GRADIENTS |
spellingShingle |
15 GEOTHERMAL ENERGY 02 PETROLEUM AQUIFERS DISTRIBUTION ENTHALPY FLUID FLOW GEOTHERMAL FIELDS GEOTHERMAL SYSTEMS HEATING ICELAND PERMEABILITY RESERVOIR ENGINEERING TEMPERATURE DISTRIBUTION TEMPERATURE GRADIENTS Bodvarsson, G.S. Pruess, K. Stefansson, V. Steingrimsson, B. Bjornsson, S. Gunnarsson, A. Gunnlaugsson, E. Natural State Model of the Nesjavellir Geothermal Field, Iceland |
topic_facet |
15 GEOTHERMAL ENERGY 02 PETROLEUM AQUIFERS DISTRIBUTION ENTHALPY FLUID FLOW GEOTHERMAL FIELDS GEOTHERMAL SYSTEMS HEATING ICELAND PERMEABILITY RESERVOIR ENGINEERING TEMPERATURE DISTRIBUTION TEMPERATURE GRADIENTS |
description |
The Nesjavellir geothermal system in southern Iceland is very complex from both a thermal and hydrologic point of view. There are large pressure and temperature gradients in the wellfield and zones with drastically different pressure potentials. Thus, natural fluid flow is substantial in the system and flow patterns are complex. We have developed a two-dimensional natural state model for the Nesjavellir system that matches reasonably well the observed pressure and temperature distributions. The match with field data has allowed determination of the energy recharge to the system and the permeability distribution. Fluids recharge the system at rate of 0.02 kg/s/m with an enthalpy of 1460 kJ/kg. The permeability in the main reservoir is estimated to be in the range of 1.5 to 2.0 md, which agrees well with injection test results from individual wells. Permeabilities in shallower reservoirs are about an order of magnitude higher. Most of the main reservoir is under twephase conditions, as are shallow aquifers in the southern part of the field. The model results also suggest that the low temperatures in the shallow part of the northern region of the field may be due to the young age of the system; i.e., the system is gradually heating up. If this is the case the estimated age of the system near the wellfield is on the order of a few thousand years. |
author |
Bodvarsson, G.S. Pruess, K. Stefansson, V. Steingrimsson, B. Bjornsson, S. Gunnarsson, A. Gunnlaugsson, E. |
author_facet |
Bodvarsson, G.S. Pruess, K. Stefansson, V. Steingrimsson, B. Bjornsson, S. Gunnarsson, A. Gunnlaugsson, E. |
author_sort |
Bodvarsson, G.S. |
title |
Natural State Model of the Nesjavellir Geothermal Field, Iceland |
title_short |
Natural State Model of the Nesjavellir Geothermal Field, Iceland |
title_full |
Natural State Model of the Nesjavellir Geothermal Field, Iceland |
title_fullStr |
Natural State Model of the Nesjavellir Geothermal Field, Iceland |
title_full_unstemmed |
Natural State Model of the Nesjavellir Geothermal Field, Iceland |
title_sort |
natural state model of the nesjavellir geothermal field, iceland |
publishDate |
2006 |
url |
http://www.osti.gov/servlets/purl/887106 https://www.osti.gov/biblio/887106 |
long_lat |
ENVELOPE(-21.251,-21.251,64.115,64.115) |
geographic |
Nesjavellir |
geographic_facet |
Nesjavellir |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://www.osti.gov/servlets/purl/887106 https://www.osti.gov/biblio/887106 |
_version_ |
1772815718649167872 |