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# AAPG Bulletin

AAPG Bulletin, Preliminary version published online Ahead of Print 1 October 2022.

DOI:10.1306/eg08232121005

## CO2 Storage Efficiency involving Basalt-Sedimentary Interaction within the Parana Basin, Brazil

### Abraham-A M. Richardson and Colombo C. G. Tassinari

Carbon capture and storage (CCS) in underground structures depends on the quality of the geological reservoir. Factors including interconnectivity in the pore spaces, natural fractures, reservoir thicknesses/depths, pre-existing fluid (water or hydrocarbon), traps, and overburden integrity express the CO2 storage potentials of the geological reservoirs. The study presents the CO2 storage efficiency factors considering the associated geological parameters involving basalt, shale, carbonate, and siltstone. It evaluates the interactions between basalt-sedimentary rocks and their Impact on the complex, inhomogeneous and unconventional reservoir systems in the Parana Basin concerning CO2 storage. It considers the reservoir porosity (Ф), thickness (h) and area (A) with the associated uncertainties involving the efficiency factors (Ea, Eh and Ea) to propose the algorithm for capacity estimation. Each rock unit has its limitations concerning CO2 storage; however, the potentials for CO2 repositioning abound. Based on the storage efficiency parameters, the suggested reservoir options include the basalts and the hybrid geological reservoir of the Irati Formation considering; the shale-carbonate reservoir, the shale-siltstone reservoir, the carbonate-siltstone reservoir, and the shale-carbonate-siltstone reservoir. Reservoir options within the Rio Bonito Formation could include sandstone and the sandstone-siltstone hybrid. The hybrid reservoir option may increase the CO2 repositioning capacities by reducing some of the input parameters’ associated limitations. Prospects for CO2 injection wells and storage site monitoring and leakages detection abound, considering existing related programs in Brazil and the proximity of well-equipped institutions with the technical know-how. The Research Centre for Greenhouse Gas Innovation in the Polytechnic School and the Institute of Energy and Environment of the University of São Paulo have shown keen interest in CCS-related Research. No hydrocarbon production datasets are yet associated with the study location; therefore, the findings provide the basis for estimating the CO2 storage capacity associated with rock units of the Irati and Rio Bonito’s Formations.

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