Scientific Drilling


WW185-Bohranlage

(Copyright: H.A.S. GmbH)

One of the most excting aspects of INFLUINS is the scientific drilling campaign into the Thuringian Basin. This provides invaluable subsurface data for nearly every project within INFLUINS. The borehole allows underground studies, experiments and measurements of numerous rock and fluid properties, and adds the "depth" dimension to the project as a whole.

To determine a suitable location for the hole, we used existing 2D seismic data dating from the 1990s and completed this data with our own successful seismic measurement campaign in 2011. We also included existing neighbouring bore hole information from the vicinity to predict the geological conditions we expect to find while drilling. The data from existing bore holes give us a lot of information but it is not possible to answer all scientific questions INFLUINS wants to solve. And - drilling a new bore hole affords us unique scientific opportunities to collect samples, and employ the most advanced geophysical techniques to gather scientific data.

Based on all the presurvey information the bore hole is located in the north of Erfurt and therefore in the centre of the Thuringian Basin where a nearly complete sedimentary sequence from the basin extending to the bottom of Buntsandstein will be encountered.

Information abaout the drinlling campain is available here: Bohrungsablauf (only in German).

Core samples and Cuttings:

Core samples give us insights in the geological history and the sedimentation of the Thuringian basin. Rock fissures are clues to tectonic movement in the basin. Among others we will also gather information about the permeability of the rocks with scientific measurements on the nanometer to micrometer scale. Chemical investigations help us to understand fluid-related processes, for instance concerning neomineralisations.

Online-Gasmonitoring:

Online Monitoring of Gas Drilling Mud (OLGA ) for scientific drilling allows the determination of crustal gases such as Helium, hydrogen, CO2, hydrocarbons, and radon in the drilling fluid. This allows the identification of fluid-conducting horizons and fault zone sections of increased porosity and / or permeability. Later studies on gas samples (eg noble gas isotopes 13C, H/D) help to better understand the origin and evolution of crustal fluids.

Geophysical monitoring:

In the bore hole we use logs to monitor the geophysical characteristics of the aquifers, for instance pressure and temperature profiles. The monitoring will continue for several years both in order to get long-term information and to monitor variations caused by seasonal temperature and precipitation changes. For this work we cooperate with Thüringer Landesanstalt für Umwelt und Geologie (geological survey of Thuringia).


We will construct a groundwater model combining all results in INFLUINS - including groundwater flow, their directions and influencing factors. The bore hole will be open for additional scientific investigations as well.