Flow models have the purpose of explaining and forecasting reservoir performance that can help plan the development and exploitation of the resource. Conventional and unconventional naturally fractured reservoirs are particularly difficult to model due to the interconnectivity of matrix and fracture properties. Unconventional reservoirs pose the additional challenge of accounting for natural fractures that can become conductive during hydraulic stimulation. This course explains the steps necessary to build fractured reservoir models using sound stratigraphic and structural frameworks, calibrated 3D seismic attributes, and geomechanical information. Models and concepts are examined in the context of how they impact fluid flow, reservoir simulation results, field production, and forecast.