publication . Contribution for newspaper or weekly magazine . 2017

On inferring the noise in probabilistic seismic AVO inversion using hierarchical Bayes

Madsen, Rasmus Bødker; Zunino, Andrea; Hansen, Thomas Mejer;
Open Access English
  • Published: 24 Aug 2017
Abstract
A realistic noise model is essential for trustworthy inversion of geophysical data. Sometimes, as in case of seismic data, quan- tification of the noise model is non-trivial. To remedy this, a hierarchical Bayes approach can be adopted in which proper- ties of the noise model, such as the amplitude of an assumed uncorrelated Gaussian noise model, can be inferred as part of the inversion. Here we demonstrate how such an approach can lead to substantial overfitting of noise when inverting a 1D re- flection seismic NMO data set. We then argue that usually the noise model is correlated, and suggest to infer the amplitude of a correlated Gaussian noise model. This pr...
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