Banca de DEFESA: LUCAS SILVA PEREIRA SÁTIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS SILVA PEREIRA SÁTIRO
DATE: 06/01/2026
TIME: 14:30
LOCAL: Remoto
TITLE:

Influence of CO2-rock-brine interaction on petrophysical and geomechanical properties for carbon storage in the Parnaíba Basin.

KEY WORDS:

Geological storage of CO2; rock-fluid interaction; geomechanics; petrophysics; reservoir integrity.

PAGES: 56
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Balanços Globais de Matéria e Energia
SUMMARY:

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 technological routes for decarbonization, 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. Therefore, this work investigated the possible petrophysical and geomechanical alterations in sandstone and diabase rocks from outcrops in the Parnaíba Basin, subjected to rock-fluid interaction tests with brine (formation water) and CO2. Core flooding and static reactor tests were conducted in different representative reservoir scenarios, including the wellbore scenario, the supercritical CO2 injection point, and the CO2 plume propagation front in the reservoir. Furthermore, experiments were performed at different CO2 storage periods in the rocks (1, 2, and 4 weeks) to better understand the geochemical reactions over time. Sandstone samples were exposed to CO2 in gas and brine flows in core holders. Diabase samples, due to their low permeability and porosity, were subjected to CO2 contact in static reactors. Petrophysical and geomechanical tests were conducted on rock samples before and after CO2 exposure to evaluate potential changes in the porous medium. The results demonstrated discrete petrophysical changes in the sandstone samples. Porosity showed maximum variations of 5% in the scenario around the well, and less than 7% in the scenario in front of the CO2 plume. For permeability, in the scenarios around the well, maximum reductions of 16% were observed. In the scenario in front of the CO2 plume diffusion, the variation in permeability was more subtle, with maximum variations of 9%. Geomechanical tests demonstrated that both sandstone and diabase samples underwent moderate or subtle changes in mechanical properties after exposure to CO2, with small reductions in uniaxial compressive strength (UCS) and modulus of elasticity. X-ray Diffraction (XRD) results showed that, under the evaluated conditions, no relevant mineral modifications were observed, corroborating that the observed changes are essentially due to physical mechanisms. Thus, the results provide support for evaluating the applicability and potential of the Parnaíba basin in CCS projects.

COMMITTEE MEMBERS:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Interno - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externa ao Programa - ***.025.404-** - LUANA RABELO HOLLANDA - NENHUMA
Externa à Instituição - MICHELLE SINARA GREGÓRIO DANTAS - IFRN