Abstract:

The composite method of rock permeability have always been applied in the calculation of oil reserves,complication of oilfield development plan,numerical simulation of reservoirs and other reservoir engineering research, which mainly include the permeability compositon of vertically different stratigraphic horizons and the permeability composition of different permeable zones along filtrational directions.Based on Darcy's law and combined with established filtration pattern,two composite formulas of permeability have been derived from mathematic calculation.The composite formula of permeability in vertically different stratigraphic horizons corresponds to that in historical literature,but the composite formula in different permeable zone is more different from the forefathers' formula.Based on the examination of actual data, calculated error of new formula is about 0.28%-5.35%,which is basically within permissible error range.

Key words: permeability, reservoir engineering, permeability composition, average permeability