The paper focuses on the petrophysical evaluation of wells for the development of a geothermal district heating plant in Tønder,Denmark. The evaluation was carried out by analysis and interpretation of available data. The data used included completion reports, well logs, conventional core and side wall core data. The results from interpretation of the data include total porosity, permeability, clay volume and effective porosity for three wells. An unusual finding was the inverse relationship between porosity and permeability in the targeted layer of the reservoir. This inverse relationship, maybe attributed to the precipitation of salt and the presence of caverns or fractures.


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