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Discussion papers
https://doi.org/10.5194/se-2019-46
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-46
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 19 Mar 2019

Research article | 19 Mar 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Full waveform inversion of short-offset, band-limited seismic data inthe Alboran basin (SE Iberia)

Clàudia Gras1, Valentí Sallarès1, Daniel Dagnino1, C. Estela Jiménez1, Adrià Meléndez1, and César R. Ranero2 Clàudia Gras et al.
  • 1Barcelona Center for Subsurface Imaging, ICM, CSIC, 08003, Barcelona, Spain
  • 2ICREA, Passeig de Lluís Companys, 23, 08010, Barcelona, Spain

Abstract. We present a high-resolution P-wave velocity model of the sedimentary cover and the uppermost basement until ~ 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/modeling 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) FWI 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 field-data standard low frequency content of 6 Hz.

Clàudia Gras et al.
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Short summary
We present a 2D model of the subsurface obtained by using seismic data acquired in the Alboran basin. We show the wave propagation velocity as physical property to characterize the studied area. We also explain the workflow followed to overcome the inherent problems of inverse methods used in a non-optimal dataset. The results validate the proposed workflow and the final image shows a number of geological meaningful structures providing a new insights in the formation/evolution of the basin.
We present a 2D model of the subsurface obtained by using seismic data acquired in the Alboran...
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