An analogous reservoir is one in the same geographic area that is formed by the same, or very similar, geological processes as a reservoir in question in so far as sedimentation, diagenesis, pressure, temperature, chemical and mechanical history and structure are concerned. It also has the same or similar geologic age, geologic features, and reservoir rock and fluid properties. Analogous features and characteristics can include approximate depth, pressure, temperature, reservoir drive mechanism, original fluid content, oil gravity, reservoir size, gross thickness, net-to-gross ratio, lithology, heterogeneity, porosity and permeability