3D Seismic Interpretation and Modeling to Assess Regional Geothermal Potential in Lower Saxony

The Uppermost Maastrichtian calcarenites in the North German Basin are considered a promising mid-depth geothermal reservoir. However, their subsurface architecture is highly variable due to a complex tectono-stratigraphic evolution, making it difficult to predict reservoir geometry and quality based solely on borehole data, especially in structurally heterogeneous areas.

To enhance spatial understanding and reduce geological uncertainty, 3D seismic data originally acquired for hydrocarbon exploration were reinterpreted and analyzed using OpendTect software. The seismic interpretation workflow involved the application of various filtering techniques aimed at reducing noise and improving the visibility of geological structures. Filters were applied to highlight discontinuities and improve the resolution of fault patterns. In addition, parametrized volumes were generated to assist in identifying and delineating potential fault zones. A suite of seismic attributes was used to further analyze and characterize the reservoir’s structural and stratigraphic framework. Key reservoir horizons were tracked using the ‘Inversion+’ method, allowing for more accurate and geologically consistent horizon interpretation.

These methods significantly improved the visualization of critical geological features, including fault systems, stratigraphic boundaries, and lateral thickness variations. By integrating seismic interpretation with borehole data, a detailed 3D subsurface model was developed. Based on the model, the evolution of the reservoir should be reconstructed, the structural framework should be checked for consistency, and zones with enhanced geothermal potential should be identified. The combined approach enables more accurate reservoir characterization and helps reduce exploration risk in complex geological settings. Our presentation will provide initial insights into our ongoing work.