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Bayesian Gaussian Mixture Linear Inversion for Geophysical Inverse Problems

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Abstract

A Bayesian linear inversion methodology based on Gaussian mixture models and its application to geophysical inverse problems are presented in this paper. The proposed inverse method is based on a Bayesian approach under the assumptions of a Gaussian mixture random field for the prior model and a Gaussian linear likelihood function. The model for the latent discrete variable is defined to be a stationary first-order Markov chain. In this approach, a recursive exact solution to an approximation of the posterior distribution of the inverse problem is proposed. A Markov chain Monte Carlo algorithm can be used to efficiently simulate realizations from the correct posterior model. Two inversion studies based on real well log data are presented, and the main results are the posterior distributions of the reservoir properties of interest, the corresponding predictions and prediction intervals, and a set of conditional realizations. The first application is a seismic inversion study for the prediction of lithological facies, P- and S-impedance, where an improvement of 30% in the root-mean-square error of the predictions compared to the traditional Gaussian inversion is obtained. The second application is a rock physics inversion study for the prediction of lithological facies, porosity, and clay volume, where predictions slightly improve compared to the Gaussian inversion approach.

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Acknowledgements

Authors acknowledge the University of Wyoming and the URE-initiative at NTNU for the support.

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Authors and Affiliations

  1. Department of Geology and Geophysics, University of Wyoming, Laramie, WY, USA

    Dario Grana

  2. Department of Mathematical Sciences, Norwegian University of Science and Technology, Trondheim, Norway

    Torstein Fjeldstad & Henning Omre

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  1. Dario Grana
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  2. Torstein Fjeldstad
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  3. Henning Omre
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Correspondence to Dario Grana.

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Grana, D., Fjeldstad, T. & Omre, H. Bayesian Gaussian Mixture Linear Inversion for Geophysical Inverse Problems. Math Geosci 49, 493–515 (2017). https://doi.org/10.1007/s11004-016-9671-9

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  • DOI: https://doi.org/10.1007/s11004-016-9671-9

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