Banca de QUALIFICAÇÃO: JOÃO AUGUSTO DE OLIVEIRA CUNHA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOÃO AUGUSTO DE OLIVEIRA CUNHA
DATE: 17/09/2021
TIME: 14:30
LOCAL: Vídeoconferência – www.youtube.com/watch?v=6X6244wwyWo
TITLE:

Seismic stratigraphy and seismic geomorphology of fluvial to shallow marine deposits of the Açu Formation, Albo-Cenomanian of the Potiguar Basin, Brazilian Equatorial Margin

KEY WORDS:

Açu Formation; Brazilian Equatorial Margin; seismic stratigraphy; sequence stratigraphy;

seismic geomorphology.

PAGES: 60
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The Açu Formation, part of the stratigraphic framework of the Potiguar Basin, corresponds to a siliciclastic succession deposited between the early Albian and the Cenomanian, through fluvial, deltaic, and estuarine systems. The deposits from that unit are especially important as they hold about 70% of the basin's hydrocarbon reserves. In this perspective, the main purpose of this research is the stratigraphic characterization of the Açu Formation deposits, from the recognition of surfaces and units of sequence stratigraphy. Furthermore, seismic geomorphology has been used in order to define the depositional architecture of the recognized units. For this purpose, this work has been applying, in a first stage, seismic (2D and 3D) and well data arranged on the continental shelf of the Potiguar Basin. The seismic-

stratigraphic interpretations, concatenated with observations in the geophysical and lithological profiles of the wells, led to the recognition of eleven seismic horizons representative of significant stratigraphic surfaces (sequence boundaries, maximum flooding and maximum regressive surfaces). These horizons limit three depositional sequences (1, 2 and 3), as well as subdividing each into three systems tracts: lowstand, transgressive, and highstand. The horizon slices and proportional slices techniques, inserted in the seismic geomorphology framework, are being applied to the recognized units and surfaces, together with the RMS amplitude and sweetness seismic attributes. These techniques allowed, so far, the identification of linear features parallel to the coastline, which were interpreted as shelf sand ridges. Such features present high to intermediate values of the seismic attributes and occur associated with the transgressive systems tracts of sequences 1 and 3, which suggests a genetic relationship with the transgression events. Shelf sand ridges can constitute important exploratory plays in shallow waters, considering that they correspond to sandstone bodies surrounded by marine mudstones.

BANKING MEMBERS:
Externo à Instituição - FÁBIO BERTON
Externa ao Programa - 1884342 - DEBORA DO CARMO SOUSA
Externa à Instituição - RENATA DOS SANTOS ALVARENGA - UFRGS
Presidente - 1149363 - VALERIA CENTURION CORDOBA