<p>Repurposing of oil and gas wells for geothermal energy involves several critical steps, including assessing the well’s structural integrity, evaluating the reservoir’s thermal properties, and modeling the potential energy output. The development of geothermal systems is naturally uncertain due to sub-state conditions, thermal conductivity, and inequalities in fluid flow behavior. Reliable performance forecasting and optimal well design depend on this rigorous modeling and simulation. As a result, global interest in sustainable energy has accelerated the use of abandoned oil and gas wells as viable resources for geothermal energy production. This study investigates the feasibility of repurposing abandoned oil wells in the Volve oil field in the North Sea as geothermal energy sources. This research shows the effects of petrophysical properties (i.e., permeability and porosity) on enthalpy production derived from reservoir modeling, and examines the uncertainty in these properties to achieve more accurate reservoir characterization and modeling. The following methodological framework was employed: First, reliable and coherent three-dimensional models of petrophysical properties were developed using geostatistical sequential simulations to improve well log data and spatial patterns as revealed by spatial covariances and variograms. Next, these models were updated to align with historical production data. After validation, the models were utilized to forecast enthalpy production. Based on the results, the Volve reservoir can produce an average of 2,094&#xa0;MWh of geothermal energy each year, yielding a total energy output of about 41,877&#xa0;MWh over a 20-year operating period.</p>