Local Update of Object-Based Geomodels

Abstract

Summary The possibility of updating reservoir models with new well information is important for good reservoir management. The process of drilling a new well through to update of the static model and to history match the new model is often a time-consuming process. This paper presents new algorithms that allow the rapid updating of object-based facies models by further development of already existing models. 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 that are not influenced by the new wells are not changed. A local update of a specified region of the reservoir can be performed, leaving the rest of the reservoir unchanged or with minimum change because of new wells. In this method, the main focus is 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, thereby preserving the good history match.