Banca de QUALIFICAÇÃO: ISABELA CARVALHO VAZ

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ISABELA CARVALHO VAZ
DATE: 12/12/2025
TIME: 09:00
LOCAL: Videoconferência
TITLE:

Fault growth mechanisms and fault damage zone development in the region of Iracema Field, Santos Basin, Brazil

KEY WORDS:

Fault zones; fault linkage; rift evolution; seismic interpretation; Santos Basin

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

Fault zones are defined as deformed rock volumes characterized by slip surfaces and subsidiary structures in their damage zones. Studying their architecture and evolution is essential to understand deformation mechanisms and crustal behavior. This study investigates fault growth processes, specially segmentation, interaction, and linkage, in the region of Iracema Field, Santos Basin. The basin has been interpreted as a major relay zone between two diachronous rift segments formed during the Early Cretaceous during the Pangea breakup. The present research aims to understand the fault geometry relationships (i.e., fault displacement and length; fault displacement and damage zone width) and to assess how the tectonic setting influenced the fault growth processes. We performed lithostratigraphic and structural interpretations of the seismic volume available for the area, which resulted in the identification of five seismic horizons, representing the top of the formations of the pre-salt section. Additionally, we identified 1,258 faults, predominantly normal, with many of them presenting a dextral strike-slip component, associated with flower structures, as well as normal inverted faults. Two main fault sets in the NW–SE/NNW–SSE and NE–SW directions were characterized, which compose contrasting deformation sectors in the study area. From this dataset, we selected 51 faults for quantitative analysis of throw–length (D–L) relationships. Throw profiles show both symmetrical and asymmetrical geometries, the latter indicating segment linkage and interaction. A decrease in throw from the rift to the post-rift phases reflects a reduction in the deformation intensity upward in the section. In the phase that marks the Lower Barra formation deposition, the faults grow mainly in length, followed by a moment of a slight increasement in displacement for the Upper Barra Velha formation. However, the process of how faults evolved and connected with time will be discussed in the next steps of this research. Activities related to damage zone characterization using deep learning methods for automatic fault interpretation will be conducted in the further phases of this study. The results from this study will provide new insights into fault evolution within transfer zones and contribute to a better understanding of the tectonic development of the Santos Basin

COMMITTEE MEMBERS:
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG
Interno - 350640 - FRANCISCO HILARIO REGO BEZERRA
Externo à Instituição - THIAGO DA SILVA MARINHO
Interno - ***.785.944-** - VINCENZO LA BRUNA - NÃO INFORMADO
Presidente - 349684 - WALTER EUGENIO DE MEDEIROS