Banca de QUALIFICAÇÃO: JOÃO AUGUSTO DE OLIVEIRA CUNHA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOÃO AUGUSTO DE OLIVEIRA CUNHA
DATA : 19/12/2017
HORA: 09:00
LOCAL: Laboratório de Geologia e Geofísica do Petróleo I
TÍTULO:

Stratigraphic evolution of the Drift Regressive Supersequence of the Potiguar Basin (NE of Brazil)

PALAVRAS-CHAVES:

Potiguar Basin; Drift Regressive Supersequence; Sequence Stratigraphy

PÁGINAS: 30
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The Potiguar Basin is located at the intersection between the east and equatorial Brazilian borders, covering almost totally the Rio Grande do Norte State and occupying only a portion of the Ceará State. The sedimentary record of this basin is represented by rocks that were deposited from the Neocomian to the Pleistocene, during different tectonosedimentary stages, being them: Rift, Post-Rift and Drift. The Drift stage, in particular, refers to a subsidence period controlled by thermal and isostatic mechanisms, which allowed the deposition, in an open sea context, of a Drift Supersequence, which can be subdivided in the transgressive and regressive phases. This last phase is characterized by the sedimentation of the Barreiras, Tibau, Guamaré and Ubarana formations, which depict a depositional configuration marked by coastal, platform, slope and deep marine systems. In this context, the main purpose of the work was to perform a stratigraphic analysis of this Drift Regressive Supersequence, based on a Sequence Stratigraphy perspective, aiming at a better understanding of its sedimentary evolution. For this purpose, the information contained in well folders, the logs and lithological profile data from four wells, were used during a 1D analysis phase. Then, the information from the previous phase was integrated into four seismic lines, which were interpreted during a 2D analysis phase. From the integration of these two analyzes, it was possible to identify five depositional sequences in the study succession, which are constituted by the Lowstand Systems Tract (LST), Transgressive Systems Tract (TST) and Highstand Systems Tract (HST). Within these genetic units, eight seismic facies were characterized, which could be subdivided according to the predominant lithologic class found in the wells, into sandstone (A1 and A2), pelitic (P1 and P2), carbonate (C1, C2 and C3) and mixed (M1). In general, the two older sequences (1 and 2) were characterized by a preponderance of slope facies, designated by strongly progradational patterns. Sequences 3 and 4, on the other hand, were evidenced by the sedimentation of more platform facies with a greater aggradational tendency, the first being marked by a large development of the carbonate factory and the second by a significant siliciclastic influx. Finally, Sequence 5 was only observed in the seismic domain, comprising the filling deposits of an incised valley

MEMBROS DA BANCA:
Presidente - 1149363 - VALERIA CENTURION CORDOBA
Externo ao Programa - 2490483 - ALEX FRANCISCO ANTUNES
Externo à Instituição - LILIANE RABELO CRUZ - PETROBRAS