Quantifying and Updating Facies Uncertainties Using ES-MDA - Real Field Case Study

We implemented the Adaptive Plurigaussian Simulation method under the Fast Model Update framework on a real field case, utilizing the Ensemble Smoother Multiple Data Assimilation method for assisted history matching. The exercise we present shows that updating facies realizations on a grid by grid level, allows controlling or avoiding the stochastic variations that could lead to a significant spread in reservoir pressure behavior and the fluid flows. The implementation brought to the asset team new history matching opportunities and also a robust tool for reservoir understanding. It has a direct impact on several reservoir management activities, like detailed well planning, production forecast and drainage strategy optimization, where the reservoir simulation models are broadly used.