Advances in computing technology have allowed the development of sophisticated 3D cellular modeling and visualization software, which has found a variety of applications in the oil industry. This technology includes spatial attribute modeling and the visualization of hydrocarbon reservoirs to improve the understanding of the geological structure including internal features and the distribution of formation properties.

This paper discusses experiences gained in building a geological model for the LL-03 reservoir (in this reservoir there is a horizontal well drilling strategy) and the subsequent manipulation and transfering of this data into a 3D reservoir simulator for initialization purposes.

The paper covers the modeling of fault planes in complex reservoirs, the handling of both vertical and sloping fault surface and the distribution of petrophysical properties (porosity, permeability and water saturation) of the geological model to be used in the reservoir simulation.

The technique presented here differs considerably from the traditional method for fault interpretation. This new method consists in interpreting the plane that describes the fault in the space, using several techniques that allow defining the structural framework. Advantages for both, geocientists and reservoir engineers in displaying and reviewing the 3D image of the fault planes and the reservoir at an early stage in the project are discussed.

The paper concludes with suggestion for developments of the workflow to create the most realistic fault plane according to the structural framework to further enhance the effectiveness of the present 3D modeling method.

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