Topics: Reservoir Engineering, reservoir, reservoir geometry, phase envelope, unsteady flow, productivity index, relative permeability behavior, oil formation volume factor, hydrocarbon reserves, volumetric reserves estimation, contour, condensate reservoir calculation, water influx, aquifer influs, aquifer models, pot aquifer model, Schilthuis model, Hurst modified steady-state model, Van Everdingen moder, Carter-Tracy model, Fetkovich Aquifer model, material balance, reservoir drive mechanisms, gas cap expansion drive, rock compressibility, connate water expansion drive, gas drive reservoir, water drive reservoir, decline curve analysis, pressure regimes, fluid contacts, inflow performance relationship, history matching, pressure match, reservoir performance prediction