IDENTIFICATION OF POTENTIAL CO2 INJECTION ZONES IN THE SERRA GERAL GROUP: A GEOPHYSICAL ANALYSIS OF LEGACY DRILLED WELLS
DOI:
https://doi.org/10.5380/bpg.v83i2.99862Abstract
The basalts of the Serra Geral Group (SGG) in the Paraná Basin have gained attention due to their potential for CO2 mineralization. Despite its vast extent (~787,000 km²), geological data are limited, hindering the identification of suitable storage zones. This study proposes an integrated workflow based on geophysical log interpretation from four wells (1-PT-1-PR, 2-AN-1-PR, 1-API-1-PR and 1-AV-1-PR) located in a region with potential for CO2 geological storage. Well 1-PT-1-PR was used as a reference model and revealed distinct patterns of flow interiors and interflow horizons. Porosity was estimated using a velocity-porosity relationship based on P-wave velocities. High-porosity zones (Φ>10%) were identified, associated with flow tops or bases, and compound flows. High-porosity zones exhibited low density (~2 g/cm³), porosity values up to 30%, and low P-wave velocities (~3.1 km/s). Additional high-porosity intervals were identified in the other wells, with “net-to-gross” ratios ranging from 19% to 43%. Gamma ray peaks, caliper log excursions, and reduced resistivity values supported the presence of altered and porous zones. The recurrence of high-porosity intervals and their potential lateral continuity indicate the feasibility of future CO2 injection. The workflow applied in this study enhances the understanding of lava flow architecture in the SGG and provides a framework for identifying prospective CO2 injection zones. Future work will focus on sub-regional correlation to support site-specific mineralization projects.
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