TY - JOUR
T1 - Geoelectrical baseline model of the subsurface of the Hontomín site (Spain) for CO2 geological storage in a deep saline aquifer
T2 - a 3D magnetotelluric characterisation
AU - Ogaya, Xènia
AU - Queralt, Pilar
AU - Ledo, Juanjo
AU - Marcuello, Álex
AU - Jones, Alan G.
PY - 2014/8
Y1 - 2014/8
N2 - The magnetotelluric (MT) method was used to characterise the underground research laboratory (URL) for CO2 storage in a deep saline aquifer at Hontomín (Spain). A total grid of 109 closely-spaced broadband MT sites was acquired in the study area covering an areal extent of 3×5km2. Different three-dimensional (3D) inversion codes were employed to invert the MT data in the period range of 0.001-10s (frequency range 1000-0.1Hz), with all of them giving similar results. The final preferred 3D model validates a previously published two-dimensional (2D) MT study and is supported by a variety of multidisciplinary data (e.g., well log, 3D seismic and hydrogeochemistry data). The 3D model constitutes the baseline electrical resistivity model of the site that will be used for the future time-lapse electromagnetic (EM) monitoring experiments of the URL. The 3D resistivity distribution shows the dome-like structure of the saline aquifer and images fracture regions, thus identifying the most likely leakage pathways and consequently, the monitoring requirements of the Hontomín site.
AB - The magnetotelluric (MT) method was used to characterise the underground research laboratory (URL) for CO2 storage in a deep saline aquifer at Hontomín (Spain). A total grid of 109 closely-spaced broadband MT sites was acquired in the study area covering an areal extent of 3×5km2. Different three-dimensional (3D) inversion codes were employed to invert the MT data in the period range of 0.001-10s (frequency range 1000-0.1Hz), with all of them giving similar results. The final preferred 3D model validates a previously published two-dimensional (2D) MT study and is supported by a variety of multidisciplinary data (e.g., well log, 3D seismic and hydrogeochemistry data). The 3D model constitutes the baseline electrical resistivity model of the site that will be used for the future time-lapse electromagnetic (EM) monitoring experiments of the URL. The 3D resistivity distribution shows the dome-like structure of the saline aquifer and images fracture regions, thus identifying the most likely leakage pathways and consequently, the monitoring requirements of the Hontomín site.
KW - 3D modelling
KW - Electrical resistivity
KW - Geoelectrical baseline model
KW - Geophysical imaging
KW - Magnetotellurics
UR - http://www.scopus.com/inward/record.url?scp=84903947145&partnerID=8YFLogxK
U2 - 10.1016/j.ijggc.2014.04.030
DO - 10.1016/j.ijggc.2014.04.030
M3 - Article
AN - SCOPUS:84903947145
VL - 27
SP - 120
EP - 138
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
SN - 1750-5836
ER -