The course begins with an overview of fluid properties and their behaviour under changing conditions; this is followed by an overview of material balance calculations which rely on PVT data. The next concept is fluid flow in porous media; which introduces permeability and Darcy’s Law. This leads on to a review of well testing and the analysis of pressure data; one of the main sources of permeability estimates. The next two topics cover what the reservoir engineer has to deliver – production forecasts and resource estimates. The final topic will be Enhanced Oil Recovery (EOR).