  A geothermal well doublet, designed for two primary aims of research and
commercial heat supply, is planned to be constructed on the campus of Delft
University of Technology. The plans include a comprehensive research programme,
including installation of a wide range of instruments alongside a comprehensive
logging and coring programme and an extensive surface monitoring network. The
wells will be cored, with samples from all representative geological units down
to the reservoir. An extensive suite of well-logs is planned to provide
detailed information on the properties of the various units. Fibre-optic cables
will be installed in both wells all the way down to the reservoir section,
which is anticipated to be at 2200m, in the Lower Cretaceous Delft Sandstone.
The Delft sandstone is well-known as a reservoir rock for natural gas in the
West Netherlands Basin. The wells will be operated by a commercial entity, but
the infrastructure is designed and explicitly installed as a research
infrastructure. As such it will become part of the European EPOS (European
Plate Observing System, https://www.epos-ip.org), such that accessibility and
data availability will not be limited to TU Delft researchers. The university
has made a decision in principle to start drilling no later than 2020.
