Ultra Deep Geothermal EnergyTo meet the industrial heat demand in a sustainable way it is necessary to extract geothermal energy from greater depths than has been done so far. Compared to conventional deep geothermal energy, for Ultra Deep Geothermal (UDG) energy we are looking for much higher temperatures of at least 150°C. Such high temperatures are not feasible for the currently existing geothermal plants in the Netherlands, but for industrial application and the production of electricity values of 150°C and more are essential.
In the Netherlands the average geothemal gradient is about 31°C per kilometer. Therfore, for UDG we need look for reservoirs at a depth of at least four kilometers. A promising reservoir at these depths are the limestone layers of the Lower Carboniferous. This rock formation is currently seen as the potential reservoir for UDG application.
T&A Survey's study
T&A Survey has done research to the potentials and risks of Ultra Deep Geothermal in the Netherlands, focussing mainly on the Lower Carboniferous. Using seismics, borehole information and literature, we developed a unique spatial insight into the presence of layers of potential reservoir rock at UDG depths in the Netherlands. In addition, we performed a petrophysical analysis in order to determine the quality of the reservoir. Based on the results and the risk assesment, a detailed map of UDG potential has been developed. With what we have learned form the research, we will be able to fulfill an advisory role in future UDG project.
The Dutch government, research institutes and seven business consortiums on June 19th 2017 signed the so called Green Deal Ultra Deep Geothermal Energy, stating that 30% of the industrial heat demand can in the future be met by UDG. This is an important step towards mapping the UDG potential in te Netherlands and lays the foundations for further development of the technology.
If you want more information or have questions about this promising new technology, please don't hesitate to contact us.
Image: carbonate platform at a depth of 4 to 5 kilometers in the Dutch underground.