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This study evaluates, at basin scale, the CO2 storage potential of the Early Cretaceous Serra Geral basalts in the Paraná Basin, Brazil. We couple common chance mapping with storage resource estimation to map the Total Storage Resource (TSR) and refine to a Prospective Storage Resource (PSR) by incorporating supercritical CO2 conditions, freshwater constraints, and pressure limitations. Porosity is derived from density and inverted sonic logs and cross-checked against empirical velocity-porosity relationships. Geochemistry is used to frame mineralisation potential and informs efficiency factors. Results indicate extensive plausible-likely fairways for storage, with basin-wide TSR and PSR values comparable in order of magnitude to other flood basalt provinces. These screening outputs provide a practical framework for focusing site-scale appraisal.
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