The purpose of this paper is threefold:(1) to present a method of buildup analysis (RHM) that can determine the percentage of reservoir column open to the wellbore which is contributing reservoir fluid, (2) to determine the average permeability of the permeable portion of the reservoir open to the wellbore and (3) to determine the possible existence of a dual porosity system and the characteristics of the fracture or vugular system that might produce reservoir fluid into the wellbore. Since RHM is a relatively new concept, two appendices are attached to explain the general aspects of the RHM procedure. The writer presented a paper related to this one at the 1987 SPE Regional California Meeting in April, 1987, (see reference 4).

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