Complex structures, such as foothills thrusts, and restricted areas are commonly coincident in prospective areas. As result, non-uniform illumination is obtained on horizons underneath the structures. In order to find a balance between illumination and environmental impact we propose a methodology to optimize the acquisition geometry, taking into account the three objective functions: illumination of target horizon, environmental impact and cost. Additionally an uncertainty analysis on the structural model was performed. It allows obtaining the optimal illumination for the target formation minimizing the environmental impact.