Many oil and gas reservoirs have their associated aquifers, which provide them with some pressure support and form a hydraulic system. When material balance calculations are applied to such reservoirs, aquifer behavior models are required. In practice, the most common procedure is to assume an aquifer model, which has an analytical solution that can readily be implemented. The simplest methods are based on the Steady State (Schilthuis), Modified Steady State (Hurst), and the Unsteady State (Van Everdingen and Hurst), models. For correct description of the hydraulic system using the available techniques, it is required to have a minimum set of information about the reservoir and aquifer, such as: viscosities, compressibilities, permeabilities, volumetric factors, and geometry of aquifer and reservoir. To overcome possible lack of some of this information, the technology of aquifer influence function "AlF" has been developed and therefore employed.
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