Banca de QUALIFICAÇÃO: MARIA CLARA DE MENESES LOURENÇO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARIA CLARA DE MENESES LOURENÇO
DATE: 30/01/2025
TIME: 09:00
LOCAL: Auditório do LGGP II
TITLE:

CO2 Storage in Onshore Basins of Northeastern Brazil: Identification of Potential Areas, Geological Modeling, and Rock-Fluid Interaction Assessment

KEY WORDS:

Geological Carbon Storage; Parnaíba Basin; Multiscale Geological Assessment

PAGES: 68
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

With climate change, reducing greenhouse gases in the atmosphere has become an emerging global goal.
One of the most effective approaches is carbon capture and geological storage, where gas quantities in the range of mega to gigatons can be stored. A major challenge in these operations lies in understanding the interactions between rocks, CO2, and other fluids, as well as their implications for estimating storage capacities and safety. This study presents initial results related to the identification and geological evaluation of a site for carbon storage within the onshore sedimentary basins of northeastern Brazil. The site selection process included regional analysis, area screening, and the ultimate selection of a target site, heavily reliant on the availability of pre-existing geological data. The chosen study area encompasses the 3D seismic data area of Capinzal do Norte, in the Parnaíba Basin, with the Poti Formation identified as the reservoir and the Sardinha Formation diabase as the sealing rock. At this stage, subsurface aspects were analyzed using data from three wells located within the seismic volume area, as well as preliminary seismic-structural and seismic-stratigraphic interpretations of this volume. Well analysis revealed the presence of three significant diabase intervals, with one well showing the Poti
Formation intruded by the upper diabase level, indicating a configuration of interest for carbon storage. Based on well data, the Poti Formation exhibits interbedded sandstones and mudstones with lateral facies variation. Seismic interpretation identified four main faults, oriented approximately N-S to NW-SE, interpreted as strike-slip faults. Four horizons were tracked based on key reflectors, with seismic-to-well ties suggesting that the shallowest horizon corresponds to a surface of the Early Carboniferous–Early Triassic sequence, while the other three horizons relate to different diabase sill levels. The upper sill level was mapped as the most structured, showing arched and ramp-like structures, which characterize the site of interest. In some cases, these geometries are associated with faults. In parallel with the subsurface analysis, sandstone samples from the Poti Formation outcrop and diabase samples from three Sardinha Formation outcrops were collected to support laboratory evaluations. The samples were characterized for their petrography and petrophysics and will be used in future experimental carbon storage tests. Outcrop sandstone from the Poti Formation exhibits tidal flat facies, characterized as lithic arkosic sandstone, predominantly composed of K-feldspars, quartz, rock fragments, and significant clay mineral content. The analyzed samples showed an average effective porosity of 25% and permeability ranging from 20 to 100 mD, indicating satisfactory permoporosity for reservoir representation. In the case of the Sardinha Formation, compositional and textural variations were observed among the three outcrop samples, but all consist of diabase composed primarily of labradorite-type plagioclase, augite-type clinopyroxene, and opaque minerals. Diabase samples showed effective porosity below 0.01% and permeability below 0.001 mD, representing excellent sealing rock properties. Elastic properties of the outcrop samples were also measured. Poti Formation sandstone exhibited P-wave velocity (Vp) of about 2700 m/s and S-wave velocity (Vs) of 1650 m/s. For diabases, Vp values ranged from approximately 5400 to 6000 m/s, and Vs values ranged from 2400 to 3100 m/s. Although still ongoing, experimental storage tests will be conducted using the CO2 Storage 700 equipment, which simulates subsurface pressure and temperature conditions, considering saline aquifer scenarios. CO2 storage tests are planned for durations of 1, 2, 4, and 8 weeks. The next steps of this research involve refining the stratigraphic and seismic-structural interpretation of subsurface data, conducting storage experiments, characterizing rock samples post-tests, evaluating rock-fluid interaction mechanisms, and assessing the implications of observed alterations at the scale of subsurface data.  

COMMITTEE MEMBERS:
Interno - 1451214 - ADERSON FARIAS DO NASCIMENTO
Presidente - 2490483 - ALEX FRANCISCO ANTUNES
Externo ao Programa - 1754344 - MARCOS ALLYSON FELIPE RODRIGUES - nullInterna - 1149363 - VALERIA CENTURION CORDOBA
Interno - ***.901.818-** - YOE ALAIN REYES PEREZ - UFRN