Banca de QUALIFICAÇÃO: LARISSA DOS SANTOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LARISSA DOS SANTOS
DATE: 26/12/2025
TIME: 09:00
LOCAL: Laboratório de geologia
TITLE:

THERMAL EFFECT OF CENOZOIC BASIC INTRUSIONS ON THE PERMEABLE-POROUS SYSTEM OF SANDSTONES AND LIMESTONES OF THE POTIGUAR BASIN

KEY WORDS:

Potiguar Basin; igneous intrusions; thermal effects; petrophysical properties; Nuclear Magnetic Resonance

PAGES: 34
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Cenozoic igneous intrusions are widely distributed in the Potiguar Basin and predominantly affect sedimentary rocks of the Açu and Jandaíra formations. The interaction between heat, hydrothermal fluids and host rocks can significantly modify reservoir petrophysical properties, with direct implications for hydrocarbon exploration. This study aims to identify and characterize variations in petrophysical properties (porosity and permeability), as well as petrographic, textural and geochemical changes in thermally affected siliciclastic and carbonate rocks intruded by basic igneous bodies, and to delimit the extent of thermal effects in the host rocks. The methodology included fieldwork, sampling of host and intrusive rocks, preparation of polished thin sections impregnated with blue epoxy resin, petrographic analysis under optical microscopy, gas porosity and permeability measurements (N₂), and Nuclear Magnetic Resonance (NMR) analyses. Preliminary results indicate that thermal effects associated with igneous intrusions generally lead to a reduction in porosity and permeability in both carbonate and siliciclastic rocks, particularly near intrusive contacts. NMR data reveal a decrease in pore fractions associated with larger pores and a relative increase in bound water, indicating progressive deterioration of reservoir quality. Petrographic observations show mineral recrystallization, silicification, dolomitization, and pore and fracture filling by secondary phases, supporting the petrophysical data. These results highlight the importance of integrated approaches to assess the impact of magmatism on the evolution of pore–permeability systems in sedimentary rocks of the Potiguar Basin.

COMMITTEE MEMBERS:
Presidente - 350630 - ZORANO SERGIO DE SOUZA
Interno - 1506706 - MILTON MORAIS XAVIER JUNIOR
Interna - 1149363 - VALERIA CENTURION CORDOBA
Externa à Instituição - CRISTIANE PAULINO DE MENEZES
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG