This work presents new type curves for the characterization of a naturally-fractured (dual-porosity) reservoir. These type curves were motivated by new approximate solutions for the pressure derivative which apply during the transitional flow period which exists between the two classical semilog straight lines. These approximate solutions suggest the appropriate pressure, pressure-derivative, integral-pressure-derivative and time groups necessary to prepare type curves. New type curves are presented for both the pseudosteady-state interporosity flow model of Warren and Root and the transient interporosity flow model of Kazemi and de Swaan.

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