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Wave-Equation Dispersion Inversion of Guided P Waves in a Waveguide of Arbitrary Geometry
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference & Exhibition 2018 Workshop Programme, Jun 2018, cp-556-00087
- ISBN: 978-94-6282-257-3
Abstract
We present the theory for wave-equation inversion of dispersion curves obtained from guided P waves. The misfit function is the sum of the squared differences between the wavenumbers along the predicted and observed dispersion curves, and the inverted result is a high-resolution estimate of the near-surface P-velocity model. This procedure, denoted as the wave equation dispersion inversion of guided Pwaves (WDG), is valid for near-surface waveguides with irregular layers. It is less prone to the cycle skipping problems of full waveform inversion (FWI) and can sometimes provide velocity models with higher resolution than wave-equation traveltime tomography (WT). The synthetic and field data examples demonstrate that WDG for guided P-waves can accurately reconstruct the P-wave velocity distribution in laterally heterogeneous media.