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A MUltiple Space and Time scale approach for the quAntification of deep saliNe formations for CO2 storaGe


In North-Germany sedimentary basin, a single-well site is available for HCM [hydro-chemo-mechanical] and solute transport testing. The abandoned gas well Horstberg mainly serves as a test well for the geothermal project “GeneSys”. The objectives of the project “GeneSys“ are the demonstration of geothermal heat extraction from low permeable sedimentary rocks and the testing of new single well concepts for the recovery of geothermal energy. The well Horstberg Z1 was drilled in 1987 and is located some 80 km north-east of Hannover.

Horstberg location is not, strictly-speaking, adequate for CO2 storage. The abandoned gas well Z1 has been previously used as a test well for geothermal purposes. The site displays low permeable aquifers at great depth and high temperatures in connection to a complex inversion structure related to salt domes. A fault cutting through the well provides investigations on migration. Two sandstone layers the 20 m thick Volpriehausen sandstone and the 55 m thick Detfurth sandstone to be considered to be the main reservoirs for CO2.

Horstberg site – data (LIAG, Christian Sperber)

Role of Horstbert site in the MUSTANG project:

For the GeneSys-project a comprehensive dataset characterizing this particular reservoir was produced. This dataset is now being used in the MUSTANG project to perform theoretical model-studies of the CO2 spreading behavior in fractured sedimentary rocks of low permeability by applying the standard tools developed in the MUSTANG project.

In the strictly scientific MUSTANG project there are no plans to inject CO2 in Horstberg or to perform any further experiments at this site.

Horstberg site -Stratigraphic column. Four different sandstone intervals separated by seal units. Data gathered from these. Sonic and GR show an alternating sequence of sandstone and claystone bed. (LIAG, Christian Sperber)

©Mustang - 2009