Publication 163

Geoelectrical baseline model of the subsurface of the Hontomín site (Spain) for CO2 geological storage in a deep saline aquifer: a 3D magnetotelluric characterization

Ogaya, X., P. Queralt, J. Ledo, A. Marcuello, and A.G. Jones


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 soundings was acquired in the study area covering an areal extent of 3x5 km2. Different three-dimensional (3D) inversion codes were employed to invert the MT data in the period range of 0.001 to 10 s (frequency rage 1000 – 0.1 Hz), 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.


International Journal of Greenhouse Gas Control, , accepted, 29 April 2014. [PDF preprint]

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Alan G Jones / 01 May 2014 /