Assessment of the geothermal energy production potential, in an early decision stage of a development project, is subjected to great uncertainty due to the often sparse data coverage. By using all available data i.e. wireline logs, core analysis data and seismic interpretations to construct a preliminary geological model for the area of interest, the basis for decision is strengthen. The geological model forms the basis for subsequent reservoir simulation, where the uncertainty in water flow rates from the various input parameters can be quantified. Different production strategies can be examined and optimized. Furthermore, any identified faults or geological baffles potentially constraining fluid flow may be incorporated and evaluated. The present paper illustrates the construction and use of a subsurface model to address uncertainties in early decision making for geothermal energy production projects.


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