| Title | Power to the Operators: Further Development of a Robust Modelling Tool for the Management of Low- and Intermediate-temperature Geothermal Reservoirs |
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| Authors | Gautason B, Halldórsdóttir S, Miecznik M, Magnússon R L, Marteinsson K, Þorgilsson G, Pierzcha?a K |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | |
| Abstract | Low- and intermediate-temperature geothermal reservoirs in volcanic regions and sedimentary basins are increasingly being utilized for space-heating, food-production, balneology, leisure, tourism etc. In an effort to improve the long-term operation of such geothermal reservoirs, appropriate tools from the reservoir engineer’s toolbox should ideally be made available to the geothermal field operators. This may involve developing and designing robust and user-friendly interfaces to often finicky software packages that the "terminal-loving" reservoir engineer is accustomed to. If successful, such tools will undoubtedly improve the operator’s understanding of his reservoir and its response to utilization, thereby increasing the likelihood of sustainable utilization. In addition, it will also bring to light for the operator, the enormous importance of carefully collected continuous data of high quality (e.g., pressure, temperature, flow and fluid chemistry) to the sustainable operation of the field. In this paper we report on work carried out within the EEA & Norway Grants-funded GeoModel project, a collaboration between Iceland (primarily ÍSOR) and Poland (primarily MEERI PAS). The project commenced in late 2022 and was completed in early 2025. One aspect of the work dealt with developing further the well-known Lumpfit software that has been available to the geothermal community for decades. It is used to model and predict reservoir pressure changes (water-level changes) resulting from geothermal utilization. We present the theoretical background of the underlying methodology of this newly updated tool, now known as Lumpfit++, and demonstrate its effectiveness with examples from low-temperature fields in Iceland. |