Managing Uncertainty in Geological CO 2 Storage Using Bayesian Evidential Learning

Amine Tadjer and Reidar B. Bratvold
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Amine Tadjer: Department of Energy Resources, University of Stavanger, 4021 Stavanger, Norway
Reidar B. Bratvold: Department of Energy Resources, University of Stavanger, 4021 Stavanger, Norway

Energies, 2021, vol. 14, issue 6, 1-18

Abstract: Carbon capture and storage (CCS) has been increasingly looking like a promising strategy to reduce CO 2 emissions and meet the Paris agreement’s climate target. To ensure that CCS is safe and successful, an efficient monitoring program that will prevent storage reservoir leakage and drinking water contamination in groundwater aquifers must be implemented. However, geologic CO 2 sequestration (GCS) sites are not completely certain about the geological properties, which makes it difficult to predict the behavior of the injected gases, CO 2 brine leakage rates through wellbores, and CO 2 plume migration. Significant effort is required to observe how CO 2 behaves in reservoirs. A key question is: Will the CO 2 injection and storage behave as expected, and can we anticipate leakages? History matching of reservoir models can mitigate uncertainty towards a predictive strategy. It could prove challenging to develop a set of history matching models that preserve geological realism. A new Bayesian evidential learning (BEL) protocol for uncertainty quantification was released through literature, as an alternative to the model-space inversion in the history-matching approach. Consequently, an ensemble of previous geological models was developed using a prior distribution’s Monte Carlo simulation, followed by direct forecasting (DF) for joint uncertainty quantification. The goal of this work is to use prior models to identify a statistical relationship between data prediction, ensemble models, and data variables, without any explicit model inversion. The paper also introduces a new DF implementation using an ensemble smoother and shows that the new implementation can make the computation more robust than the standard method. The Utsira saline aquifer west of Norway is used to exemplify BEL’s ability to predict the CO 2 mass and leakages and improve decision support regarding CO 2 storage projects.

Keywords: uncertainty quantification; carbon storage; Bayesian evidential learning; data assimilation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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