Near-surface Full Waveform Inversion Using Surface Waves and Reflected Waves
I. Masoni, W. Zhou, R. Brossier, L. Métivier, S. Operto and J.M. Virieux
Event name: 76th EAGE Conference and Exhibition - Workshops
Session: WS06 - Surface Wave Analysis
Publication date: 16 June 2014
Info: Abstract, PDF ( 584.78Kb )
We investigate the capacity of extracting near-surface shear-wave velocity by considering dispersive surface waves and non-dispersive reflected waves. We show that indeed the full waveform fitting of these waves requires a dedicated approach by using lateral spatial and frequential coherence for surface waves and by explicitely introduces the fitting of reflected waves in the inversion formulation. On a simple example as a two-layers model, lateral variations of the velocity are reconstructed while the low-wavenumber content of the velocity could be improved through reflection waves. Combining these two sources of information on the shear-wave velocity could improve our shear-wave velocity imaging in the near-surface context.