SE Solid Earth SE Solid Earth 1869-9529 Copernicus Publications Göttingen, Germany 10.5194/se-4-481-2013 3-D reflection seismic imaging of the Hontomín structure in the Basque–Cantabrian Basin (Spain) Alcalde J. https://orcid.org/0000-0001-9806-5600 1 2 Martí D. 1 Juhlin C. https://orcid.org/0000-0003-2776-0846 3 Malehmir A. https://orcid.org/0000-0003-1241-2988 3 Sopher D. 3 Saura E. https://orcid.org/0000-0003-3525-9904 1 Marzán I. 1 Ayarza P. https://orcid.org/0000-0001-7166-2974 4 Calahorrano A. 5 Pérez-Estaún A. 1 2 Carbonell R. https://orcid.org/0000-0003-2019-1214 1 Institute of Earth Sciences Jaume Almera CSIC, Barcelona, Spain CIUDEN Foundation, Ponferrada, Spain Department of Earth sciences, Uppsala University, Uppsala, Sweden University of Salamanca, Geology Department, Salamanca, Spain Barcelona Center for Subsurface Imaging, Barcelona, Spain 09 12 2013 4 2 481 496 Copyright: © 2013 J. Alcalde et al. 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://se.copernicus.org/articles/4/481/2013/se-4-481-2013.html The full text article is available as a PDF file from https://se.copernicus.org/articles/4/481/2013/se-4-481-2013.pdf

The Basque–Cantabrian Basin of the northern Iberia Peninsula constitutes a unique example of a major deformation system, featuring a dome structure developed by extensional tectonics followed by compressional reactivation. The occurrence of natural resources in the area and the possibility of establishing a geological storage site for carbon dioxide motivated the acquisition of a 3-D seismic reflection survey in 2010, centered on the Jurassic Hontomín dome. The objectives of this survey were to obtain a geological model of the overall structure and to establish a baseline model for a possible geological CO<sub>2</sub> storage site. The 36 km<sup>2</sup> survey included approximately 5000 mixed (Vibroseis and explosives) source points recorded with a 25 m inline source and receiver spacing. The target reservoir is a saline aquifer, at approximately 1450 m depth, encased and sealed by carbonate formations. Acquisition and processing parameters were influenced by the rough topography and relatively complex geology. A strong near-surface velocity inversion is evident in the data, affecting the quality of the data. The resulting 3-D image provides constraints on the key features of the geologic model. The Hontomín structure is interpreted to consist of an approximately 10<sup>7</sup> m<sup>2</sup> large elongated dome with two major (W–E and NW–SE) striking faults bounding it. Preliminary capacity estimates indicate that about 1.2 Gt of CO<sub>2</sub> can be stored in the target reservoir.

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