| Title | Controlling Role of Salt Tectonics on the Architecture of a Mid-Depth Geothermal Reservoir Based on 3D Seismic Interpretation in the North German Basin |
|---|---|
| Authors | Michael Erb |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | Seismic Interpretation, Geodynamics, Reservoir Architecture, North German Basin |
| Abstract | The calcarenitic units of the Upper Maastrichtian Reitbrook Formation in the North German Basin represent a promising mid-depth geothermal reservoir. Borehole data from previous hydrocarbon exploration reveal a complex reservoir structure, with significant variations in depth and thickness, due to tectonic and sedimentary processes. To enhance reservoir characterization and reduce geological uncertainty, a legacy 3D seismic dataset was reinterpreted using advanced techniques in OpendTect. The seismic interpretation workflow included the application of noise-reducing filters, seismic attribute analysis, and the ‘Inversion+’ method to trace key reflectors, supported and validated by the integration of interpreted borehole data. These methods enabled enhanced 3D imaging of structural discontinuities such as faults, significant variations in stratigraphic thickness and depth, as well as the geometry of salt bodies. The results demonstrate that salt tectonics significantly controlled reservoir architecture during both syn- and post-sedimentary processes. Variations in accumulation space driven by synsedimentary salt movement led to the development of minibasins and the relocation of depocenters, producing spatial heterogeneity in sediment thickness and distribution. Post-sedimentary salt dynamics further reconfigured the reservoir through folding, faulting, and ongoing subsidence. The study emphasizes the importance of salt tectonics in controlling reservoir heterogeneity and highlights the value of interpreted 3D seismic data for geothermal exploration. Our findings highlight that a thorough understanding of geodynamic processes is essential for developing reliable geothermal reservoir models and optimizing exploration strategies, including the identification of thick, well-preserved sedimentary units, fault zones, and deeper regions with favourable thermal conditions. |