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Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia)

AuthorsGras Andreu, Claudia ; Dagnino, D. ; Jiménez-Tejero, C.E. ; Meléndez, Adrià ; Sallarès, Valentí ; Ranero, César R.
Issue DateOct-2019
PublisherEuropean Geosciences Union
CitationSolid Earth 10(6): 1833-1855 (2019)
AbstractWe present a high-resolution P-wave velocity model of the sedimentary cover and the uppermost basement to ∼3 km depth obtained by full-waveform inversion of multichannel seismic data acquired with a 6 km long streamer in the Alboran Sea (SE Iberia). The inherent non-linearity of the method, especially for short-offset, band-limited seismic data as this one, is circumvented by applying a data processing or modelling sequence consisting of three steps: (1) data re-datuming by back-propagation of the recorded seismograms to the seafloor; (2) joint refraction and reflection travel-time tomography combining the original and the re-datumed shot gathers; and (3) full-waveform inversion of the original shot gathers using the model obtained by travel-time tomography as initial reference. The final velocity model shows a number of geological structures that cannot be identified in the travel-time tomography models or easily interpreted from seismic reflection images alone. A sharp strong velocity contrast accurately defines the geometry of the top of the basement. Several low-velocity zones that may correspond to the abrupt velocity change across steeply dipping normal faults are observed at the flanks of the basin. A 200–300 m thick, high-velocity layer embedded within lower-velocity sediment may correspond to evaporites deposited during the Messinian crisis. The results confirm that the combination of data re-datuming and joint refraction and reflection travel-time inversion provides reference models that are accurate enough to apply full-waveform inversion to relatively short offset streamer data in deep-water settings starting at a field-data standard low-frequency content of 6 Hz
Description23 pages, 16 figures, 1 table, supplementary material https://doi.org/10.5194/se-10-1833-2019
Publisher version (URL)https://doi.org/10.5194/se-10-1833-2019
Identifiersdoi: 10.5194/se-10-1833-2019
issn: 1869-9510
e-issn: 1869-9529
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