Banca de QUALIFICAÇÃO: HERISCARTH MARCELL DANTAS PINHEIRO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : HERISCARTH MARCELL DANTAS PINHEIRO
DATE: 25/12/2025
TIME: 14:00
LOCAL: Auditório - Depto Geologia
TITLE:

Geophysical-Geological Study of Volcanic Bodies in the Potiguar Basin

KEY WORDS:

Potential Methods; UAV; 3D Modeling; Magnetic Susceptibility; Potiguar Basin.

PAGES: 51
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

In the Potiguar Basin, diabase and basalt plugs and dikes intrude sandstones and carbonates, causing metamorphic halos, silicification, and karstification, in processes that can be efficiently mapped by high-resolution magnetic surveys, especially with the use of UAVs, which combine precision, low cost, and minimum environmental impact. Through the integration of geophysical methods, such as gravimetry, magnetometry, and electrical resistivity, combined with morphostructural, petrographic, and petrophysical analyses, the goal is to map magmatic bodies and elucidate their relationships with hydrothermal alteration zones, faults, and petrophysical parameters in carbonates. This multidisciplinary approach allows for understanding the role of magmatic intrusions in the formation and reactivation of geological structures, providing support for the development of predictive models that assess the quality of oil reservoirs. This doctoral work, inserted into the REFRAS Project – PoroCarste Phase II, is dedicated to the detailed study of the influence of intrusive magmatism on hydrocarbon source and reservoir rocks in outcrop analogs of the Pre-Salt of the Potiguar Basin. The interaction between magmatism and sedimentation is fundamental for understanding the petroleum systems of the Brazilian Pre-Salt, where volcanic bodies act as heat sources and structural traps, favoring the generation and accumulation of hydrocarbons. To optimize the mapping of critical structures, ideal grid and altitude parameters were evaluated in magnetic surveys of three volcanic bodies in the region, using magnetic susceptibility data to constrain a 3D model and deepen the investigation of intrusive bodies in carbonate rocks. Preliminary results indicate a flight line grid of 100 x 100 m, with a flight height of 75 m, as the arrangement that provides the most efficient resolution. Of the total of 260 magnetic susceptibility measurements in the three areas, 58 performed in the São João area show a gradation of values with an increase toward the volcanic cores, corroborating previous petrographic and petrological studies. The halo of influence of magmatism in the carbonate rocks could be preliminarily inferred to be between 0.010 x 10-3and 8.9 x 10-3 SI. Currently, the refinement of the aeromagnetic data of the Analogues-F and the gravimetric and electrical resistivity surveys in the regions of Nova Conquista, Serrinha, and São João are underway. Simultaneously, five boreholes were drilled, whose core samples will be analyzed to determine density, porosity, and permeability, integrating geophysical and petrophysical information to compose multidisciplinary models. It is expected that the processing and interpretation of these data will result in the production of articles for international publication, presentations at scientific events, and, ultimately, the defense of the thesis to obtain the title of Doctor.

COMMITTEE MEMBERS:
Externa à Instituição - ALANNY CHRISTINY COSTA DE MELO
Presidente - 1315614 - DAVID LOPES DE CASTRO
Interno - 349684 - WALTER EUGENIO DE MEDEIROS
Interno - 350630 - ZORANO SERGIO DE SOUZA