Faults are structures typically interpreted in two dimensions, such assurfaces, in seismic data and are similarly represented in geological models of oil reservoirs. However, faults are three-dimensionally complex zones that represent regions of weakness that concentrate fractures and highly heterogeneously deformed rocks. Therefore, the adequate representation of these zonesis important for the management and economic evaluation of an oil field, withan impact on the areas of drilling, completion and location of wells, strategies for increasing the recovery factor and even on estimating the recoverable reserve. Due to the great importance of fractured carbonate reservoirs, more than 60 percent of the proven oil reserves and 40 percent of the gas reserves in the world[1] are present in these reservoirs, the proposed work aims at the geomechanical modeling of a geological fault in carbonate rocks of Saudi Arabia s Gawar reservoir from deformability parameters obtained by Ameen et al. [2]. The work also addresses the impacts of the spatial resolution of seismic data on the interpretation of these structures, through the simulation of the fault seismic image. The results show that the discrete element method is an adequate tool for realistic modeling of geological faults, however, some models obtained unrealistic results due to the difficulty of maintaining the confining stress during fault production. The studies showed that although the volumetric interpretation of these structures through interpretation methodologies based on seismic attributes are possible, there is a considerable limitation due to the spatial resolution and the inadequacy of the seismic data to adequately deal with the lateral contrast of acoustic properties present in areas close to the damage zones.