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Wave-Equation Dispersion Inversion of Guided P Waves in a Waveguide of Arbitrary GeometryNormal access

Authors: J. Li, S. Hanafy and G. Schuster
Event name: 80th EAGE Conference & Exhibition 2018 Workshop Programme
Session: WS13: Surface and Internal Multiples - Lose them or Use them?
Publication date: 15 June 2018
DOI: 10.3997/2214-4609.201801961
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 347.44Kb )
Price: € 20

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.

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