دورية أكاديمية
Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia)
| العنوان: | Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia) |
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| المؤلفون: | C. Gras, D. Dagnino, C. E. Jiménez-Tejero, A. Meléndez, V. Sallarès, C. R. Ranero |
| المصدر: | Solid Earth, Vol 10, Pp 1833-1855 (2019) |
| بيانات النشر: | Copernicus Publications, 2019. |
| سنة النشر: | 2019 |
| المجموعة: | LCC:Geology LCC:Stratigraphy |
| مصطلحات موضوعية: | Geology, QE1-996.5, Stratigraphy, QE640-699 |
| الوصف: | We 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1869-9510 1869-9529 |
| Relation: | https://www.solid-earth.net/10/1833/2019/se-10-1833-2019.pdf; https://doaj.org/toc/1869-9510; https://doaj.org/toc/1869-9529 |
| DOI: | 10.5194/se-10-1833-2019 |
| URL الوصول: | https://doaj.org/article/89ab34975ece4141bf8f74ddd8f1148a |
| رقم الأكسشن: | edsdoj.89ab34975ece4141bf8f74ddd8f1148a |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 18699510 18699529 |
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| DOI: | 10.5194/se-10-1833-2019 |