Geoelectrical baseline model of the subsurface of the Hontomín site (Spain) for CO2 geological storage in a deep saline aquifer

a 3D magnetotelluric characterisation

Xènia Ogaya*, Pilar Queralt, Juanjo Ledo, Álex Marcuello, Alan G. Jones

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)120-138
Number of pages19
JournalInternational Journal of Greenhouse Gas Control
Volume27
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • 3D modelling
  • Electrical resistivity
  • Geoelectrical baseline model
  • Geophysical imaging
  • Magnetotellurics

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