A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses

The resolution of surface-acquired magnetotelluric data is typically not sufficiently high enough in monitoring surveys to detect and quantify small resistivity variations produced within an anomalous structure at a given depth within the subsurface. To address this deficiency we present an approach...

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Autores: Ogaya Garcia, Xènia, Ledo Fernández, Juanjo, Queralt i Capdevila, Pilar, Jones, Alan G., Marcuello Pascual, Alejandro
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/162704
Acceso en línea:https://hdl.handle.net/2445/162704
Access Level:acceso abierto
Palabra clave:Electromagnetisme
Prospecció magnetotel·lúrica
Electromagnetism
Magnetotelluric prospecting
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spelling A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responsesOgaya Garcia, XèniaLedo Fernández, JuanjoQueralt i Capdevila, PilarJones, Alan G.Marcuello Pascual, AlejandroElectromagnetismeProspecció magnetotel·lúricaElectromagnetismMagnetotelluric prospectingThe resolution of surface-acquired magnetotelluric data is typically not sufficiently high enough in monitoring surveys to detect and quantify small resistivity variations produced within an anomalous structure at a given depth within the subsurface. To address this deficiency we present an approach, called "layer stripping", based on the analytical solution of the one-dimensional magnetotelluric problem to enhance the sensitivity of surface magnetotelluric responses to such subtle subsurface temporal variations in resistivity within e.g. reservoirs. Given a well-known geoelectrical baseline model of a reservoir site, the layer stripping approach aims to remove the effect of the upper, unchanging structures in order to simulate the time-varying magnetotelluric responses at depth. This methodology is suggested for monitoring all kinds of reservoirs, e.g. hydrocarbons, gas, geothermal, compress air storage, etc., but here we focus on CO2 geological storage. We study one-dimensional and three-dimensional resistivity variations in the reservoir layer and the feasibility of the method is appraised by evaluating the error of the approach and defining different detectability parameters. The geoelectrical baseline model of the Hontomín site (Spain) for CO2 geological storage in a deep saline aquifer is taken as our exemplar for studying the validity of the 1D assumption in a real scenario. We conclude that layer stripping could help detect resistivity variations and locate them in the space, showing potential to also sense unforeseen resistivity variations at all depths. The proposed approach constitutes an innovative contribution to take greater advantage of surface magnetotelluric data and to use the method as a cost-effective permanent monitoring technique in suitable geoelectrical scenarios.Elsevier B.V.2020202020162020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion61 p.application/pdfhttps://hdl.handle.net/2445/162704Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jappgeo.2016.06.014Journal of Applied Geophysics, 2016, vol. 132, p. 100-115https://doi.org/10.1016/j.jappgeo.2016.06.014cc-by-nc-nd (c) Elsevier B.V., 2016http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1627042026-05-29T05:05:01Z
dc.title.none.fl_str_mv A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
title A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
spellingShingle A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
Ogaya Garcia, Xènia
Electromagnetisme
Prospecció magnetotel·lúrica
Electromagnetism
Magnetotelluric prospecting
title_short A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
title_full A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
title_fullStr A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
title_full_unstemmed A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
title_sort A layer stripping approach for monitoring resistivity variations using surface magnetotelluric responses
dc.creator.none.fl_str_mv Ogaya Garcia, Xènia
Ledo Fernández, Juanjo
Queralt i Capdevila, Pilar
Jones, Alan G.
Marcuello Pascual, Alejandro
author Ogaya Garcia, Xènia
author_facet Ogaya Garcia, Xènia
Ledo Fernández, Juanjo
Queralt i Capdevila, Pilar
Jones, Alan G.
Marcuello Pascual, Alejandro
author_role author
author2 Ledo Fernández, Juanjo
Queralt i Capdevila, Pilar
Jones, Alan G.
Marcuello Pascual, Alejandro
author2_role author
author
author
author
dc.subject.none.fl_str_mv Electromagnetisme
Prospecció magnetotel·lúrica
Electromagnetism
Magnetotelluric prospecting
topic Electromagnetisme
Prospecció magnetotel·lúrica
Electromagnetism
Magnetotelluric prospecting
description The resolution of surface-acquired magnetotelluric data is typically not sufficiently high enough in monitoring surveys to detect and quantify small resistivity variations produced within an anomalous structure at a given depth within the subsurface. To address this deficiency we present an approach, called "layer stripping", based on the analytical solution of the one-dimensional magnetotelluric problem to enhance the sensitivity of surface magnetotelluric responses to such subtle subsurface temporal variations in resistivity within e.g. reservoirs. Given a well-known geoelectrical baseline model of a reservoir site, the layer stripping approach aims to remove the effect of the upper, unchanging structures in order to simulate the time-varying magnetotelluric responses at depth. This methodology is suggested for monitoring all kinds of reservoirs, e.g. hydrocarbons, gas, geothermal, compress air storage, etc., but here we focus on CO2 geological storage. We study one-dimensional and three-dimensional resistivity variations in the reservoir layer and the feasibility of the method is appraised by evaluating the error of the approach and defining different detectability parameters. The geoelectrical baseline model of the Hontomín site (Spain) for CO2 geological storage in a deep saline aquifer is taken as our exemplar for studying the validity of the 1D assumption in a real scenario. We conclude that layer stripping could help detect resistivity variations and locate them in the space, showing potential to also sense unforeseen resistivity variations at all depths. The proposed approach constitutes an innovative contribution to take greater advantage of surface magnetotelluric data and to use the method as a cost-effective permanent monitoring technique in suitable geoelectrical scenarios.
publishDate 2016
dc.date.none.fl_str_mv 2016
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/162704
url https://hdl.handle.net/2445/162704
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.jappgeo.2016.06.014
Journal of Applied Geophysics, 2016, vol. 132, p. 100-115
https://doi.org/10.1016/j.jappgeo.2016.06.014
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2016
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier B.V., 2016
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 61 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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