Exploration-relevant sandstones of the Valanginium in Lower Saxony 1: 500 000 — Porosity from core data

The overview map shows the distribution of the Valanginium (lower chalk) in the Lower Saxony Basin and presents in particular exploration-relevant sandstones and their properties. Regionally contiguous sandstones with a thickness of at least five metres are referred to as exploration relevant. For these units, a potential as geothermally usable aquifers can be presumed, which, however, must be demonstrated on a site-by-case basis. This is shown on the overview map of claystones, siltstones, clay-silty sandstones and low-powered sandstones. Porosity, permeability and transmissivity of lithologies have not been taken into account during mapping, but are indicated as drill-related parameters where available. Porosities of the sandstones were calculated from the information from the hydrocarbon database from drill core data and, if available, from well measurements. Porosities from drill core data are to be understood as effective porosities (%) and from well measurements as total porosity (%).