Improving Seismic Sections quality by Detailed Velocity Analysis and NU-CNS: A Case Study from Jinding Zinc-Lead Mining Area
Improved Seismic Sectioins using Updated Velocity Stacks
Keywords:
2-D seismic reflection survey, Velocity Analysis, low SNR data, mineral exploration, Jinding Zn-Pb ore depositAbstract
The giant Jinding Zn-Pb deposit, located in the Meso-Cenozoic Lanping Basin, SW China, is structurally controlled by complex fault systems and evaporite-related deformation. However, the deep (>500 m) geological architecture remains poorly constrained. This study presents results from 2-D seismic reflection data processed using an enhanced workflow including coherent noise attenuation, surface-consistent amplitude compensation, detailed velocity analysis, and post-stack migration. Pre- and post-processing comparisons show significant improvement in reflector continuity and signal-to-noise ratio (SNR). Amplitude spectra analysis indicates suppression of low-frequency noise (<15 Hz) and preservation of structural frequencies between 20-45 Hz. Refined semblance analysis improved velocity picking stability, resulting in clearer imaging of reflections between 0.5-3.0 s TWT (approximately 500-3000 m depth). The processed sections reveal gently dipping stratigraphic reflections intersected by steep reverse and strike-slip faults. These structures correlate with known ore-controlling faults and suggest deep fluid migration pathways. Depth-converted sections and 3-D modeling highlight structural doming and fault intersections that likely controlled mineralization. The results refine the structural model of the Jinding deposit and demonstrate that optimized seismic processing can effectively image complex mineral systems in tectonically deformed basins.
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