A reservoir's boundary conditions are the pressure states or fluxes that are assumed to occur at the reservoir's edge. These conditions can be used in analytical reservoir and hydrogeological models.
Types of reservoir boundary conditions
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No-flow boundary: No flow occurs at the boundary (I.e., a sealing fault)
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Constant flow boundary: A constant flow occurs at the boundary - perhaps injection of a fluid at a distance from the observation well.
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Constant pressure gradient boundary: A constant pressure gradient occurs at the boundary.
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Constant pressure boundary: A constant pressure occurs at the boundary. Perhaps a pressure source like an aquifer.