3D seismic data acquired in the Ballena permits has been reprocessed by REPSOL during 2009 using the technique known as Bandwidth Extension (Smith et al., 2008). The target of the reprocessing was to broaden the seismic bandwidth and increase the temporal resolution of the 3D data over the Xana accumulation, in order to better image the oil-bearing thin turbiditic sands which are the main reservoir of the area. As a result of the reprocessing, peak frequency of the data increased from 22 Hz to 58 Hz and the vertical resolution improved from 25 m down to 12 m. Successive seismic prestack inversion of the bandwidth extended data led to the interpretation of two separate Santonian turbidite lobes of oil-bearing sands which were drilled by the wells MCC-3 and MCC-4, and a third different Cenomanian turbiditic sand body drilled by the well MCC-2. New structural and thickness maps have been elaborated and offered a better understanding of the geology and reservoir sand distribution.


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