Analysis of Production Data from Fractured Liquid Dominated Geothermal Reservoirs in Iceland

Abstract

The functional relation between production mass flow and the resulting pressure decline furnishes important data on various reservoir properties. In conjunction with particular interpretational models these relations provide estimates of reservoir parameters. Since such results are contingent upon the models selected, were refer to the estimates as apparent values of the parameters. Using available production data form liquid dominated geothermal systems in Iceland we have obtained some estimates of the reservoir parameters of the Icelandic flood basalts. Based on simple free liquid surface interpretational models, the inferred apparent permeability of the flood basalts of north central Iceland is less than 10/-15 m2. The values for the southwest of Iceland are an order of magnitude higher.