Potencial das rochas da Bacia dos Parecis na região de Tangará da Serra - MT como reservatório para o armazenamento geológico de CO₂

Abstract

The dependence on continuous economic growth has driven industrialization and increased greenhouse gas emissions, leading to climate change and socio-economic risks. The fight against global warming involves reducing greenhouse gas emissions and using carbon dioxide removal technologies from the atmosphere. Brazil has high per capita emissions, highlighting the need for these actions, and within this context geological CO2 storage is a potential solution. This study investigates the potential of Mesozoic volcanicsedimentary sequences in Tangará da Serra region, as reservoirs for geological CO2 storage. The porosity, permeability, and chemical composition of these rocks were considered. The research evaluated the potential of igneous rocks through carbonate mineralization and the suitability of sedimentary rocks for storage in saline aquifers. For the Parecis Basin rocks, porosities range from 0.01 – 21%, with the higher values found in sandstones of Rio Ávila Formation. The rock analysis within the Parecis Basin reveals significant potential for geological CO2 storage, but complex challenges should be considered. The Tapirapuã Formation stands out as a possible reservoir with high porosity and high concentrations of divalent cations favoring mineral carbonation processes. However, low groundwater pH and scarcity of water resource during dry periods must be carefully considered. For the siliciclastic reservoirs, challenges such low porosity, presence of clay, and intense cementation, make some of the intervals unsuitable for CO2 storage. The upper portion of the Salto das Nuvens Formation shows great potential given suitable reservoir properties, but its viability depends on the presence of seals and the depth of occurrence. Geological carbon storage is a crucial component in the fight against global warming. Therefore, future studies considering the potential of rocks in the Parecis Basin as reservoirs for geological CO2 storage should detail interval properties, considering the diversity of challenges and points presented in this work.