Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field
While the magnetotelluric (MT) method has been used in geothermal exploration for many years, the integrated evaluation of the effects of reservoir temperature, clay alteration, salinity and permeability on electrical resistivity have remained highly qualitative. In order to contribute to quantifyin...
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International Geothermal Association
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ftgriffithuniv:oai:research-repository.griffith.edu.au:10072/422752 2024-06-23T07:54:03+00:00 Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field Ardid, Alberto Dempsey, David Bertrand, Edward Sepulveda, Fabian Solon, Flora Tarits, Pascal Archer, Rosalind 2020-10-24 to 2020-10-27 Reyjavik, Iceland 2020 http://hdl.handle.net/10072/422752 unknown International Geothermal Association Proceedings World Geothermal Congress 2020+1 World Geothermal Congress 2020+1 Ardid, A; Dempsey, D; Bertrand, E; Sepulveda, F; Solon, F; Tarits, P; Archer, R, Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field, Proceedings World Geothermal Congress 2020+1, 2020 https://www.lovegeothermal.org/cpdb/record_detail.php?id=32863 http://hdl.handle.net/10072/422752 open access Resource geoscience Conference output 2020 ftgriffithuniv 2024-05-29T00:20:31Z While the magnetotelluric (MT) method has been used in geothermal exploration for many years, the integrated evaluation of the effects of reservoir temperature, clay alteration, salinity and permeability on electrical resistivity have remained highly qualitative. In order to contribute to quantifying these effects, we develop an inversion methodology that integrates methylene blue (MeB) logs from wells with the electrical resistivity distribution from MT surveys. We use this method to infer, under uncertainty, clay cap boundaries in a geothermal field. Our methodology is based on a fast stochastic inversion of MT signals using Markov Chain Monte Carlo (MCMC) to fit a one-dimensional three-layer resistivity model beneath each MT station, laterally constrained by MeB data. The advantage of our approach is the explicit investigation and visualization of inversion uncertainty, yielding inferred depth intervals for clay cap boundaries. The methodology is tested on a profile of MT stations and MeB logs in wells located in the western area of the Wairākei geothermal field in the Taupō Volcanic Zone, New Zealand. Over the long-term, our goal is to improve our knowledge of uncertainty related to MT signals and its graphical representation to enhance our understanding of the relationship between resistivity and the clay cap. No Full Text Conference Object Iceland Griffith University: Griffith Research Online New Zealand |
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Resource geoscience Ardid, Alberto Dempsey, David Bertrand, Edward Sepulveda, Fabian Solon, Flora Tarits, Pascal Archer, Rosalind Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
topic_facet |
Resource geoscience |
description |
While the magnetotelluric (MT) method has been used in geothermal exploration for many years, the integrated evaluation of the effects of reservoir temperature, clay alteration, salinity and permeability on electrical resistivity have remained highly qualitative. In order to contribute to quantifying these effects, we develop an inversion methodology that integrates methylene blue (MeB) logs from wells with the electrical resistivity distribution from MT surveys. We use this method to infer, under uncertainty, clay cap boundaries in a geothermal field. Our methodology is based on a fast stochastic inversion of MT signals using Markov Chain Monte Carlo (MCMC) to fit a one-dimensional three-layer resistivity model beneath each MT station, laterally constrained by MeB data. The advantage of our approach is the explicit investigation and visualization of inversion uncertainty, yielding inferred depth intervals for clay cap boundaries. The methodology is tested on a profile of MT stations and MeB logs in wells located in the western area of the Wairākei geothermal field in the Taupō Volcanic Zone, New Zealand. Over the long-term, our goal is to improve our knowledge of uncertainty related to MT signals and its graphical representation to enhance our understanding of the relationship between resistivity and the clay cap. No Full Text |
format |
Conference Object |
author |
Ardid, Alberto Dempsey, David Bertrand, Edward Sepulveda, Fabian Solon, Flora Tarits, Pascal Archer, Rosalind |
author_facet |
Ardid, Alberto Dempsey, David Bertrand, Edward Sepulveda, Fabian Solon, Flora Tarits, Pascal Archer, Rosalind |
author_sort |
Ardid, Alberto |
title |
Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
title_short |
Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
title_full |
Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
title_fullStr |
Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
title_full_unstemmed |
Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field |
title_sort |
uncertain estimation of clay cap boundaries using magnetotelluric and meb data: application to wairākei geothermal field |
publisher |
International Geothermal Association |
publishDate |
2020 |
url |
http://hdl.handle.net/10072/422752 |
op_coverage |
2020-10-24 to 2020-10-27 Reyjavik, Iceland |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Proceedings World Geothermal Congress 2020+1 World Geothermal Congress 2020+1 Ardid, A; Dempsey, D; Bertrand, E; Sepulveda, F; Solon, F; Tarits, P; Archer, R, Uncertain Estimation of Clay Cap Boundaries using Magnetotelluric and MeB Data: Application to Wairākei Geothermal Field, Proceedings World Geothermal Congress 2020+1, 2020 https://www.lovegeothermal.org/cpdb/record_detail.php?id=32863 http://hdl.handle.net/10072/422752 |
op_rights |
open access |
_version_ |
1802645999645097984 |