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

摘要: Abstract. We present a high-resolution P-wave velocity model of the sedimentary cover and uppermost basement to ∼3 km depth obtained by full-waveform inversion multichannel seismic data acquired with a 6  long streamer in Alboran Sea (SE Iberia). The inherent non-linearity method, especially for short-offset, band-limited seismic as this one, is circumvented by applying processing or modelling sequence consisting three steps: (1) data re-datuming back-propagation recorded seismograms the seafloor; (2) joint refraction and reflection travel-time tomography combining original re-datumed shot gathers; (3) full-waveform the original gathers using tomography as initial reference. final shows number geological structures that cannot be identified models easily interpreted from images alone. A sharp strong velocity contrast accurately defines geometry top basement. Several low-velocity zones that may correspond abrupt velocity change across steeply dipping normal faults are observed at flanks of the basin. 200–300  m thick, high-velocity layer embedded within lower-velocity sediment evaporites deposited during the Messinian crisis. results confirm combination data re-datuming joint inversion provides reference accurate enough apply full-waveform to relatively short offset deep-water settings starting at a field-data standard low-frequency content 6  Hz .