Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering
Two large (6.6) earthquakes, which occurred on June 17 and 21 2000 in S-Iceland, caused some major changes in the pressure of several geothermal reservoirs. The pressure changes correlate near perfectly with the focal mechanism of the two quakes, i.e. reservoir pressure increased in areas of rock co...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.471.1791 2023-05-15T16:48:22+02:00 Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering Grimur Björnsson Ólafur G. Flovenz Kristjan Saemundsson Einar H. Einarsson The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.471.1791 http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.471.1791 http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf text 2001 ftciteseerx 2016-01-08T07:17:43Z Two large (6.6) earthquakes, which occurred on June 17 and 21 2000 in S-Iceland, caused some major changes in the pressure of several geothermal reservoirs. The pressure changes correlate near perfectly with the focal mechanism of the two quakes, i.e. reservoir pressure increased in areas of rock compression and decreased where dilation took place. Several secondary chances were also observed. The most pronounced are in wells, which happened to tap directly from the two 15-25 km long N-S striking fractures, formed by the quakes. Near instantaneous pressure drop of 1-10 bars were common in those wells. Few reservoirs maintain pressures higher than before the quakes and few appear permanently reduced in pressure. This is suggested to be a consequence of stress driven permeability changes. Some reservoir may have changed from being confined to unconfined as a result of stress changes. Pressure changes were observed up to 75 km away from the seismic epicenters. Many of those wells are now, 6 months after the quakes, still recovering. Also of interest are a few post-quake events of pressure rise/decline, presumed to be a consequence of stress relaxation in the crust. We believe that the currently evolving database of tectonically induced pressure changes in S-Iceland is significant for the general understanding of fractured geothermal reservoirs as well as for seismology. Text Iceland Unknown |
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English |
description |
Two large (6.6) earthquakes, which occurred on June 17 and 21 2000 in S-Iceland, caused some major changes in the pressure of several geothermal reservoirs. The pressure changes correlate near perfectly with the focal mechanism of the two quakes, i.e. reservoir pressure increased in areas of rock compression and decreased where dilation took place. Several secondary chances were also observed. The most pronounced are in wells, which happened to tap directly from the two 15-25 km long N-S striking fractures, formed by the quakes. Near instantaneous pressure drop of 1-10 bars were common in those wells. Few reservoirs maintain pressures higher than before the quakes and few appear permanently reduced in pressure. This is suggested to be a consequence of stress driven permeability changes. Some reservoir may have changed from being confined to unconfined as a result of stress changes. Pressure changes were observed up to 75 km away from the seismic epicenters. Many of those wells are now, 6 months after the quakes, still recovering. Also of interest are a few post-quake events of pressure rise/decline, presumed to be a consequence of stress relaxation in the crust. We believe that the currently evolving database of tectonically induced pressure changes in S-Iceland is significant for the general understanding of fractured geothermal reservoirs as well as for seismology. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Grimur Björnsson Ólafur G. Flovenz Kristjan Saemundsson Einar H. Einarsson |
spellingShingle |
Grimur Björnsson Ólafur G. Flovenz Kristjan Saemundsson Einar H. Einarsson Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
author_facet |
Grimur Björnsson Ólafur G. Flovenz Kristjan Saemundsson Einar H. Einarsson |
author_sort |
Grimur Björnsson |
title |
Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
title_short |
Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
title_full |
Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
title_fullStr |
Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
title_full_unstemmed |
Einarsson, Pressure changes in Icelandic geothermal reservoirs associated with two large earthquakes in June 2000, paper presented at 26th workshop on Geothermal Reservoir Engineering |
title_sort |
einarsson, pressure changes in icelandic geothermal reservoirs associated with two large earthquakes in june 2000, paper presented at 26th workshop on geothermal reservoir engineering |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.471.1791 http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.471.1791 http://www.geothermal-energy.org/pdf/IGAstandard/SGW/2001/Bjornssn.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766038474836672512 |