Banca de DEFESA: JOÃO FELIPE DE SOUSA NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOÃO FELIPE DE SOUSA NETO
DATE: 28/07/2025
TIME: 10:00
LOCAL: Videoconferência
TITLE:

Stratigraphic control over hydrothermal silicification in the Afonso Bezerra Fault, Potiguar Basin, Brazil

KEY WORDS:

Silicification; hydrothermal vents; seismic attributes; fluid escape

PAGES: 42
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Hydrothermal silicification has a significant impact on the key petrophysical properties of reservoir rocks. The main constraints on silica-rich fluids are the fault cores, their damage zones, and variations in the host lithology. However, the relationship between these factors and the resulting silicification, mainly the influence of host lithology, remains poorly understood. In this study, the Cretaceous sequences of the Potiguar Basin, including the sandstones of the Açu Formation and the limestones of the Jandaíra Formation, along with the Neoproterozoic basement, are crosscut by the Afonso Bezerra Fault System, where significant occurrences of hydrothermal silicification are observed from the basement to the surface. This study employed 2D and 3D seismic data, along with well data, and applied Automatic Gain Control (AGC) and Variance Attributes to enhance the visualization and mapping of stratigraphic units, faults, and the geometry of the silicified bodies within the seismic volume. A statistical spatial analysis of the silicified bodies was conducted to assess the relationship between silicification and stratigraphy. Results revealed that the thickness variations and heterogeneous geometry are directly related to stratigraphy and tectonic controls. Carbonate rocks exhibit extensive silicification associated with higher structural extent, whereas siliciclastic rocks show narrower and less pervasive silicification. In the crystalline basement, silicification is confined to fault zones. Additionally, silicified geobodies concentrate along the strike of the Afonso Bezerra Fault. This spatial distribution highlights the primary control of stratigraphy and tectonic on hydrothermal fluid flow, thereby enhancing our understanding of hydrothermal silicification compartmentalization and providing key insights into reservoir connectivity

COMMITTEE MEMBERS:
Externo à Instituição - DAVID LINO VASCONCELOS
Externo à Instituição - JOSÉ ANTONIO BARBOSA
Presidente - 2042405 - MOAB PRAXEDES GOMES
Externo à Instituição - PEDRO XAVIER NETO