Abstract
Simple models of fluid flow and dispersion in a porous rock matrix are compared and used to match the results of tracer tests at the Wairakei (New Zealand) geothermal field. It is found that models which allow transient diffusion from fractures into the surrounding rock matrix give a better match to test results than either a model which allows only longitudinal dispersion or a pseudo steady state double porosity model. For some tests a model which includes two fractures is required to match the field data.
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