28 May 2015
In this E-Lecture James Hobro (Schlumberger Gould Research) describes a new approach to representing complex 3-D structural features (e.g. salt bodies) in gridded modelling and inversion applications. This approach removes the model parameter aliasing commonly present in gridded models and allows structural boundaries to be positioned to sub-cell accuracy. It can be linearized to enable inversion methods that operate on gridded models to update the shape parameters describing model structure directly. It is shown in synthetic modelling tests that this method significantly improves the accuracy of seismic data modelled using the finite-difference method in the presence of high-contrast structural features such as salt bodies. An application to full waveform inversion is also demonstrated using synthetic data, in which bulk shifts and fine structure are resolved in a complex top-salt Gulf-of-Mexico model.
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