Enhancing Crystalline Basement Characterization Using 3D Seismic Attributes and Spectral Decomposition: Unveiling Small-Scale Features and Complex Structures

The application of advanced 3D seismic interpretation techniques, including seismic attribute analysis and spectral decomposition, has proven to be highly effective in enhancing seismic resolution and resolving complex structural and stratigraphic features. While these methods were successfully applied in the DeepStor project to improve seismic resolution in a sedimentary basin, enabling the detection of narrow (25 m wide) paleochannels and small-scale faults, they also hold significant potential for the crystalline basement characterization, as demonstrated in the GeoLaB project. In the DeepStor area, spectral decomposition was employed to decompose seismic data into discrete frequency components, significantly improving vertical and lateral resolution. This approach, combined with coherence, curvature, and amplitude-based attributes, facilitated the identification of subtle stratigraphic and structural features, such as fault systems with throws as low as 10–15 m. Integration of RGB blending and time-frequency analysis further illuminated stratigraphic discontinuities and fault splays, offering insights into fluid migration pathways and reservoir compartmentalization. ... mehrThese techniques will be adapted for the GeoLaB project, where they can be used to identify and - possibly - to define basement structures, map major fracture networks, and resolve intricate fault systems in crystalline basement rocks. The results underscore the versatility of these workflows in both sedimentary and crystalline basement settings, supporting risk mitigation and resource exploration in the crystalline basement.