Banca de DEFESA: RODRIGO RUAN SILVEIRA DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RODRIGO RUAN SILVEIRA DE SOUZA
DATA : 04/09/2019
HORA: 09:00
LOCAL: Auditório do LGGP II
TÍTULO:

Structural evolution of the eastern border of the onshore Potiguar Rift, Potiguar Basin (NE Brazil)

PALAVRAS-CHAVES:

Onshore Potiguar Rift; relay ramps; connecting fault; physical modeling

PÁGINAS: 98
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The onshore Potiguar Rift is the result of the first rifting phase (Berriasiano - Barremiano) that gave rise to the Potiguar Basin. Its structural framework is complex, consisting of semi-grabens, internal highs and important interacting fault systems. A relatively younger rifting phase is attributed to the Aptian. Two major fault systems have controlled the origin and evolution of the basin: the Baixa Grande and Carnaubais fault systems, which delimit the Umbuzeiro semi-graben, the main depocenter of the rift. Despite the existence of a well-established structural framework, there is still no consensus on how these structures evolved. This work aimed to analyze the eastern margin of the onshore Potiguar basin, where the main faults and depocenters systems of the rift stage are located. Analysis of seismic data (2D and 3D) and available geophysical profiles of some wells showed that both fault systems evolved through nucleation, relay ramp interaction, and connection of diachronic and echelon fault segments of a smaller order. Each diachronic segment conditioned the accumulation of sedimentary sequences and, when they interacted with each other, an angular discontinuity was formed. The mechanical connection of the diachronic normal fault segments occurred by second-order fault nucleation (connection failure) in response to stress fields located in a contractional bridge between fault segments. The connection fault developed over the basement weakness zones (mylonitic fabrics) with a relatively smoother dip in relation to the main faults, resulting after a mechanical connection, in faults with ramp-flat-ramp geometry. This geometry induced the formation of anticlinals found in the vicinity of fault systems. The physical models corroborated the interpretations obtained with the seismic data and showed the importance of relay-ramp formation. A new model for the evolution of the eastern margin of the onshore Potiguar Rift and possible implications for the opening kinematics of the basin as well as for the exploration of hydrocarbons is proposed.

MEMBROS DA BANCA:
Presidente - 1217847 - FERNANDO CESAR ALVES DA SILVA
Interno - 350640 - FRANCISCO HILARIO REGO BEZERRA
Externo à Instituição - Pedro Xavier Neto - PETROBRAS