This paper presents the technical problems faced and the solutions found in the construction of a suitable static model of Bu Attifel field.

The re-interpretation of the seismic volume, the construction of a detailed sedimentological model and the accurate correlations within the reservoir allowed the identification of several tectonic phases and, particularly, the intra-Nubian tectonics affecting only the lower levels of the reservoir.

The conclusions of the geological study led to the identification of a very complex structural model due to the number, slope and, often, synsedimentary characteristics of the faults crossing the reservoir.

During simulation, it was not possible to apply the usual simplifications to the structural model since a dynamic model able to optimise future infill well locations and enhanced oil recovery processes was required.

It was then decided to build a simulation grid reconstructing both fault trend on the horizontal plane and their slope as accurately as possible.

To this purpose, a specific methodology was followed. It consisted of two main phases: the generation of a conventional model with vertical faults and the conversion into a model containing sloping faults.

The final result was the construction of a geological model and a simulation grid representing the structural complexity of the reservoir.

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