Two problems for the comparison of fractured reservoir models are presented. The first problem is a simple single block example. The second problem is a more complicated cross-sectional example. The cross-sectional example has been developed to simulate depletion, gas injection and water injection cases.

In selecting the problems for the present Comparative Solution Project, various aspects of the physics of multiphase flow in fractured porous media have been considered. The question of fracture capillary pressure and its influence on reservoir performance has been addressed by including cases with zero and non-zero gas-oil capillary pressure in the fractures.

Ten organizations participated in the Sixth Comparative Solution Project. Most of the current techniques in dual-porosity simulation are represented in the results of the participants.

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