For the realization of a geothermal system it is important to have a global but proper idea of the geothermal potential of the subsurface and the heat demand at the surface.
Geological study
An initial view of the geothermal potential of the study area can be obtained with the tool ThermoGIS, developed by TNO. In addition, Dinoloket offers the possibility to view the regional depth maps, which also underlie the ThermoGIS model, to get a general impression of the subsurface.
Seismic interpretations make it possible to map the subsurface in more detail. The required data, 2D and 3D seismics, is available at TNO, provided it is publicly available. If the seismic data in the study area is not sufficient, or there is no seismic data, it could be considered to do seismic acquisition. The availability of seismic data about the planned well trajectories reduces the uncertainty regarding the presence and subsequently the depth of target reservoirs, and the presence of fault systems.
Borehole data provides a local view of the subsurface. The required borehole data is available at TNO, provided it is publicly available. Log measurements, borehole cores and well tests provide information about the quality of the target reservoirs. Borehole data can be supportive to seismic data, and vice versa.
Furthermore, awareness of the dangers and associated risks of drilling and exploiting the subsurface is important. What are the chances of finding hydrocarbons? Could there be interference with gas production? Are there areas with potable water or nature in the study area?
The data can be collected and compiled by (geo-)technical consultants in a so-called geological (preliminary) study or quick scan. An exploration licence is required to conduct further research of the geothermal potential of a specific area. The geological (preliminary) study can be used as a geotechnical foundation for the application of an exploration licence.