8 Works

Geochemical control of hydraulic and mechanical reservoir sandstone properties

Maria Wetzel , Thomas Kempka & Michael Kühn
University of Potsdam, Institute of Geosciences(2);Geochemical processes such as mineral dissolution and precipitation alter the microstructure of rocks, and thereby affect their hydraulic and mechanical behaviour. Quantifying and considering these property changes in reservoir simulations substantially supports risk assessments related to geological subsurface utilization. In our virtual laboratory, 3D pore-scale models of typical reservoir sandstones are applied to determine the effective hydraulic and elastic properties of sandstones. In order to adequately depict characteristic distributions of...

Quantification of uranium diffusion and sorption within a geochemical gradient in the Opalinus Clay on the host rock scale

Theresa Hennig & Michael Kühn
In Claystones, the storage concept for spent nuclear fuel mainly consisting of uranium is based among others on the isolation of the radionuclides within the effective containment zone due to the high retention capacity of the host rock. The transport properties are typically determined in laboratory experiments representing the host rock and for defined geochemical conditions. However, previous numerical studies have shown for the Swiss Opalinus Clay, that sorption of uranium and with that the...

Investigating Nitrate Pollution Sources and NaturalBackground in Groundwater of the Densu Basin: A Model-based Approach

George Yamoah Afrifa , Larry-pax Chegbeleh , Patrick Asamoah Sakyi , Mark Sandow Yidana , Yvonne Sena Akosua Loh , Theophilus Ansah-Narh & Evans Manu
Nitrate is one of the dominant chemical pollutants of groundwater, and there is a need to mitigate groundwater pollution in rural, urban and industrial terrains in an aquifer system. The study assesses the extent of nitrate pollution in the Densu Basin because of its predominance in agriculture and urbanized vicinities by employing robust techniques for estimating both the natural background and human-induced concentrations. The statistical methods used to estimate these concentrations are the pre-selection method,...

Digging into Eocene hothouse climate variability: Linking X-ray fluorescence (XRF) scanning and palynology of Messel sediment cores

Stefanie Kaboth-Bahr , André Bahr , Olaf Lenz , Volker Wilde , Sonja Wedmann & Jörg Pross
The late early to early middle Eocene (~48 Ma) maar lake sediments of the famous Messel fossil-pit, located near Darmstadt, SW Germany, represent a prime archive for climate dynamics operating during the geologically most recent greenhouse period of the Earth. In this study, we investigate the potential of geochemical data obtained via high-resolution XRF core scanning to decipher hydrologic variability from the Messel sediments. Such data have the potential to yield insight into the paleoenvironmental...

Inverse geochemical modelling demonstrates how weathering and ion surface exchange control groundwater chemistry in the Pra Basin (Ghana)

Evans Manu , Michael Kühn , Thomas Kempka & Marco De Lucia
Effective implementation of sustainable water resources management is one of the daunting tasks in most parts of the world. The Pra Basin has a high economic importance, hosting most of Ghana’s mineral resources, including gold, bauxite, iron, manganese, and diamonds. Currently, the basin is faced with several water resources management issues, especially pollution arising from the discharge of untreated waste into water bodies and illegal artisanal mining. Considering this background, the present study aims to...

The image of geoscience among student teachers of geography

Simon Schneider & Richard Dahlbock
Within the framework of a study focusing on teacher training in geography at the University of Potsdam, the range of perspectives on the topics of physical geography was investigated. The starting point is that physical geography and human geography represent the main components of school geography teaching . This idea is motivated by the model of geography by Weichert (2003). Initially, physical and human geography content seemed to be present in the curriculum in roughly...

Simulation study of hydrate formation from dissolved methane in the LArge-scale Reservoir Simulator (LARS)

Zhen Li , Thomas Kempka , Erik Spangenberg & Judith Schicks
Hydrate formation from dissolved methane in saline solutions is a hydrochemical process, resulting in the accumulation of gas hydrates in sedimentary strata under the seafloor or overlain by permafrost regions. In the scope of the SUGAR framework, LARS has been established to study gas hydrate formation processes and dissociation strategies under in-situ conditions. In the latest hydrate formation experiments, key parameters have been applied to mimic the local marine environment of the Mallik site, Canada....

Revised and improved geological model of the Waiwera geothermal reservoir, New Zealand

Andreas Grafe , Thomas Kempka , Michael Schneider & Michael Kühn
Following a thermal and photogrammetric outcrop mapping campaign undertaken at the Waiwera geothermal reservoir in 2019, a pre-existing 3D hydrogeological model was revised in the present study to assess the impact of the updated structural and lithological interpretation on the existing numerical model calibration. For the latter, well data comprising measured temperature and salinity profiles were employed to reconstruct the reservoir’s natural thermal state and spatial distribution of salinity, supported by numerical simulations of density-driven...

Registration Year

  • 2022

Resource Types

  • Text


  • University of Potsdam
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • Senckenberg Society for Nature Research
  • Ghana Atomic Energy Commission
  • University of Ghana
  • Senckenberg Research Institute and Natural History Museum Frankfurt/M
  • Heidelberg University
  • Council for Scientific and Industrial Research
  • Freie Universität Berlin
  • Karlsruhe Institute of Technology