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Fonseca, R.M. (author), Chen, B (author), Jansen, J.D. (author), Reynolds, Albert C. (author)
We consider a technique to estimate an approximate gradient using an ensemble of randomly chosen control vectors, known as Ensemble Optimization (EnOpt) in the oil and gas reservoir simulation community. In particular, we address how to obtain accurate approximate gradients when the underlying numerical mod- els contain uncertain parameters...
journal article 2016