Reservoir upscaling method with preserved transmissibility

摘要

Upscaling methods first generate a low resolution (or coarse-scale) three-dimensional framework, and then calculate the reservoir properties, for instance permeability and porosity, at each cell. Each cell also includes at least one cell property, representing a feature of its corresponding volume. For example, the cell property may include rock type, porosity, permeability, water saturation, combinations thereof, and the like. The lateral transmissibilities across the coarse cells are then calculated, wherein transmissibility refers to a measure of capacity of a given viscous fluid to move across a cell boundary (or inter-node connection) under pressure drop. More specifically, transmissibility is a measure of the ability of a fluid to flow between two neighboring cells within a porous medium. The calculated transmissibility multiplier in both horizontal and vertical directions can be used as key parameters to evaluate the accuracy of an upscaled geologic model.