Numerical Reservoir Simulation that has been used in petroleum industry in the past century is a “Bottom-Up” Reservoir Modeling. An original geological model of the reservoir (Bottom) is developed by the geologist experts and is used by reservoir engineers to match the history of the hydrocarbon production (Up). Using Artificial Intelligence for Reservoir Simulation and Modeling is a “Top-Down” Reservoir Modeling. The historical hydrocarbon production along with surface related operational conditions (Top) is used for Geo-Analytics (AI-based geological modeling) to model the geology of the reservoir (Down) for the production forecasting and optimization.