High-frequency acoustic land full-waveform inversion: a case study from the Sultanate of Oman
A. Sedova, G. Royle, T. Allemand, G. Lambaré and O. Hermant
Journal name: First Break
Issue: Vol 37, No 1, January 2019 pp. 75 - 81
Info: Article, PDF ( 485.08Kb )
Applications of full-waveform inversion (FWI) to land seismic data exhibit specific challenges, largely associated with elastic effects and near-surface heterogeneities. This explains why only a few land FWI case studies have been published to date (Mothi et al., 2012; Mei et al., 2014). In recent years, the acquisition design of land surveys has improved dramatically and now offers ideal conditions for FWI: dense sampling, long offsets and full azimuths (FAZ), and very low frequencies down to 1.5 Hz (Mahrooqi et al., 2012). The first published application of 3D land FWI to this new, ultra-low frequency, data set was encouraging (Stopin et al., 2014). The authors demonstrated the capability to recover the long spatial wavelength components of the velocity model, robustly and efficiently, using diving wave FWI and basic data pre-processing. It was proposed that the resulting velocity model be used as a starting model for reflection-based tomography. Limitations in obtaining a high-resolution velocity model (> 6 Hz) from FWI were identified, and attributed to the acoustic assumption and a weak signal-to-noise ratio.