For data from fracture calibration treatments a methodology is introduced for the determination of the reservoir permeability as an addition to the usual variables of leakoff coefficient and closure pressure. The technique derives from the solution of the diffusivity equation for a well with an infinite-conductivity vertical fracture (as a multi-rate injection) with a superimposed varying filtercake skin effect. The transient reservoir response, which is found to be the essential feature, is then decoupled and used to determine the reservoir permeability.

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