TX 75083-3836, U.S.A., fax 01-972-952-9435. Abstract Object-based models can be regarded as arrangements of a population of geometrical objects in space. In reservoir modeling, these models are often used for describing meandering channel systems, fracture networks etc., where geological objects can be clearly identified. Unlike pixelbased models, object-based models can provide geologically realistic representations of reservoir heterogeneities even at the appraisal stage with few well data.

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... though an extensive literature on object-based models is available, little has been done for constraining these models to dynamic data (history matching). This is however of great importance for their application in reservoir engineering. This paper first reviews the basic concepts of the widely used object-based Boolean model. Then, we present a methodology for calibrating Boolean simulations to dynamic production data. This methodology is based on a generalization of the gradual deformation method that was initially developed for calibrating pixel-based Gaussianrelated reservoir models to dynamic data. Finally, a simple synthetic example is presented and the results show the validity of the above methodology. In particular, this methodology is potentially applicable to history matching of fractured reservoir models.