Abstract
We consider estimation of absolute permeability from inverted seismic data. Large amounts of simultaneous data, such as inverted seismic data, enhance the negative effects of Monte Carlo errors in ensemble-based Data Assimilation (DA). Multilevel (ML) models consist of a selection of models with different fidelities. Multilevel Data Assimilation (MLDA) attempts to obtain a better statistical accuracy with a small sacrifice of the numerical accuracy. Spatial grid coarsening is one way of generating an ML model. It has been shown that coarsening the spatial grid results in a problem with weaker nonlinearity, and hence, in a less challenging problem than the problem on the original fine grid. Accordingly, formulating a sequential MLDA algorithm which uses the coarser models in the first steps of the DA, followed by the finer models, helps to find an approximation to the solution of the inverse problem at the first steps and gradually converge to the solution. We present two variants of a sequential MLDA algorithm and compare their performance with both conventional DA algorithms and a simultaneous (i.e., using all the models on the different grids simultaneously) MLDA algorithm using numerical experiments. Both posterior parameters and posterior model forecasts are compared qualitatively and quantitatively. The results from numerical experiments suggest that all MLDA algorithms generally perform better than the conventional DA algorithms. In estimation of the posterior parameter fields, the simultaneous MLDA algorithm and one of the variants of sequential MLDA (SMLES-H) perform similarly and slightly better than the other variant (SMLES-S). While in estimation of the posterior model forecasts, SMLES-S clearly performs better than both the simultaneous MLDA algorithm and SMLES-H.
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Funding
Open Access funding provided by NORCE Norwegian Research Centre AS. The authors acknowledge financial support from the NORCE research project “Assimilating 4D Seismic Data: Big Data Into Big Models” which is funded by industry partners, Equinor Energy AS, Lundin Energy Norway AS, Repsol Norge AS, Shell Global Solutions International B.V., TotalEnergies EP Norge AS, and Wintershall Dea Norge AS, as well as the Research Council of Norway (PETROMAKS2). We also thank Schlumberger for providing academic software licenses to ECLIPSE.
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Appendices
Appendix A: Algorithm. Sequential multilevel ensemble smoother–straightforward formulation
Appendix B: Algorithm. Sequential multilevel ensemble smoother–hybrid formulation
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Nezhadali, M., Bhakta, T., Fossum, K. et al. Sequential multilevel assimilation of inverted seismic data. Comput Geosci 27, 265–287 (2023). https://doi.org/10.1007/s10596-023-10191-9
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DOI: https://doi.org/10.1007/s10596-023-10191-9