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Andrés, J., et al. (2016), Basement structure of the Hontomín CO2 storage site (Spain) determined by integration of microgravity and 3-D seismic data, Solid Earth, 7(3), 827-841, doi: 10.5194/se-7-827-2016.

Abstract

A multidisciplinary study has been carried out in Hontomín (Spain) to determine the basement structural setting, its geometry and the geometry of the sedimentary sucession of an area aimed to be the first Spanish pilot plant for CO2 storage.  An  integration  of  coincident  3-D  seismic  results, borehole data and unpublished microgravity data were used to reproduce the deep structure and topography of the basement and to quantify the thickness of the Triassic Keuper evaporites. The subsurface structure is characterized by a  half-graben  setting  filled  with  Keuper  evaporites  (up  to 2000 m thick), forming an extensional forced fold. All data sets  clearly  identify  two  main  fault  systems,  compartmentalizing the main structural domain into three differentiated blocks. These faults have been interpreted to be reactivated normal faults that have led to the formation of the Hontomín dome.

Original paper