Reservoir quality in porous and fractured tight sandstones and carbonates
- Ansprechperson:
Ivy Becker, Prof. Dr. Christoph Hilgers
- Projektbeteiligte:
Wintershall Holding GmbH
- Endtermin:
2019
Reducing uncertainties in reservoir characterization can immensely benefit from using quantitative outcrop analog data. The comparison of outcrop analogs with subsurface data from well cores enables the delineation of reservoir heterogeneities over basin-scale distances. We focus on the characterization of tight gas sandstone and carbonate formations in NW Germany.
The investigated Upper Carboniferous sandstones exposed in the Ibbenbüren-Osnabrück area reflect the sedimentology, stratigraphy, structure, and diagenesis of tight gas reservoirs some 50 km further north. They expose fining upwards fluvial cycles of coarse-grained sandstones into siltstones and coal seams. We show how the variation of porosity and permeability of surface and subsurface data links to the diagenetic and structural evolution of tight sandstone reservoirs.
Our methods include He-pycnometry and single-phase gas flow in an isostatic flow cell to depict potential vertical and lateral reservoir quality variations. Results are linked to diagenetic characteristics derived from thin-section analyses. We use LiDAR (terrestrial laser scanning) together with a newly developed digital workflow to semi-automatically depict fracture pattern.