Experimental study of CO₂–rock–fluid interaction in sandstone and diabase from the Parnaíba Basin for geological carbon storage.
Geological storage of CO2; rock-fluid interaction; geomechanics; petrophysics; reservoir integrity.
The intensification of carbon dioxide (CO2) emissions in recent decades, mainly from anthropogenic activities, has reinforced the need to develop technologies capable of mitigating its impacts. Among the alternatives, geological carbon storage (Carbon Capture and Storage - CCS) stands out for its ability to reduce CO2 emissions into the atmosphere, promoting the permanent trapping of CO2 in geological formations. The Parnaíba Basin presents sandstones with potential for storage and rocks such as diabase, which have suitable characteristics to act as a seal. In this context, it becomes fundamental to understand the chemical, physical, and geomechanical alterations that can occur and impact the integrity of the reservoir rock and seal rock. Thus, this project proposes to evaluate the possible geomechanical and petrophysical alterations resulting from the contact of CO₂ with rock samples from the Parnaíba Basin. To this end, a core flooding system and static reactors will be used to perform rock-fluid interaction tests involving CO₂, brine, and rock; in addition to equipment for petrophysical and geomechanical tests. Complementary characterizations will include XRD and XRF, aiming to identify possible mechanisms of dissolution, precipitation, and mineralization. In this way, it is expected to understand the effects of rock-fluid reactivity and its implications for reservoir and seal integrity over time, contributing to the advancement of solutions applicable on an industrial scale.