3-D reflection seismic imaging of the Hontomín structure in the Basque–Cantabrian Basin (Spain)

Alcalde, J.; Martí, D.; Juhlin, C.; Malehmir, A.; Sopher, D.; Saura, E.; Marzán, I.; Ayarza, P.; Calahorrano, A.; Pérez-Estaún, A.; Carbonell, R.

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 2 storage site. The 36 km 2 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 7 m 2 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 2 can be stored in the target reservoir.

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Alcalde, J. / Martí, D. / Juhlin, C. / et al: 3-D reflection seismic imaging of the Hontomín structure in the Basque–Cantabrian Basin (Spain). 2013. Copernicus Publications.

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