Abstract
Abstract A method for local updating of object-based facies models by further development of already existing software is presented. An existing facies realization is adjusted to match new well observations by changing objects locally or adding/removing objects if required. Parts of the realization which is not influenced by the new wells are not changed. Local update of a specified region of the reservoir can be performed, leaving the rest of the reservoir unchanged or with minimum change due to new wells. The main focus in the method is on the algorithm implemented to fulfill well conditioning. The effect of this algorithm on different object models is presented through several case studies. These studies show how the local update consistently includes new information while leaving the rest of the realization unperturbed and thereby preserves the good history match.
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