Banca de DEFESA: URÂNIA CATARINA FREIRE FAGUNDES DE BRITO CONCEIÇÃO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : URÂNIA CATARINA FREIRE FAGUNDES DE BRITO CONCEIÇÃO
DATA : 05/07/2019
HORA: 08:00
LOCAL: Instituto de Geociências
TÍTULO:

GEOCHEMICAL CHARACTERIZATION OF THE PETROLEUM SYSTEM SANTA BRÍGIDA-SERGI (?) FOR THE NORTH TUCANO SUB-BASIN AND JATOBÁ BASIN, BRAZIL

PALAVRAS-CHAVES:

Petroleum System Santa Brígida-Sergi (?), Tucano Norte Sub-Basin, Jatobá Basin Santa Brígida Formation.

PÁGINAS: 99
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Geologia
ESPECIALIDADE: Geoquímica
RESUMO:

The Santa Brígida Formation (Permian) occurs at the base of the stratigraphic column of the Tucano Norte Sub-Basin and the Jatobá Basin, along with other Paleozoic units. This unit appears in the Santa Brígida Graben, located around its homonymous city, east of the Tucano Norte Sub-Basin. The Ingá Member of the Santa Brigida Formation consists of pelitic facies, which were evaluated for their potential for oil. In the Jatobá Basin, near the city of Ibimirim/PE, there is an occurrence of Jurassic-Cretaceous sandstones with oil exudation in fractures, whose oil extract was analyzed geochemically, seeking to investigate the possible rock generating this exudation. Therefore, samples of the pellets of the Ingá Member were collected in the locality known as Fazenda Barriga, some of which presented Total Organic Carbon (TOC) levels varying from 1.89% to 6.7%, which allowed to classify these samples with levels of high to very high. Rock-Eval pyrolysis showed an excellent generating potential (S2 up to 46 kg / ton). Some samples are characteristically constituted by type I kerogen and others type II. However, such samples are immature (Tmax ~ 420°C). The sedimentological and palynological evidences indicate that the paleoenvironment predominant during the deposition was hot and dry. These samples predominantly present autochthonous components represented by globose amorphous organic matter (~ 90%), subordinated by pollen grains of bissacados-taenias, similar to conifers, spores and rare fragments of algae of the genus Botryococcus The organic and oily extracts present fingerprint with absence of the low and high molecular weight n-alkanes, showing that these fractions of the oil were biodegraded. The comparison between the mass chromatograms (m / z 191 and 217), as well as some saturated biomarkers, the organic extract of the pellets of the Ingá Member and the oily extract of the Jurassic-Cretaceous sandstones, indicative of the origin of the organic matter and conditions paleoenvironmental, show some correlation between both, allowing to interpret that the Ingá Member of the Santa Brígida Formation like the probable source rock of the oil exudation present in the Jurassic-Cretaceous sandstones in the Jatobá Basin. In the North Tucano Sub-basin, the analytical results indicate the probable existence of a very good source rock in the Permian sediments, configuring the possibility of a petroleum system Santa Brígida-Sergi (?). However, the North Tucano Sub-Basin has a sedimentary thickness of about only 3,000 m, which, at first, would be insufficient for the generation of oil only by the heat of thermal subsidence. In this way, it is interpreted that part of the overburden necessary for the generation of oil in this basin has been removed by erosion during the Alagoas (Aptiano).

MEMBROS DA BANCA:
Presidente - 2322888 - OLIVIA MARIA CORDEIRO DE OLIVEIRA
Interno - 950.990.506-20 - KARINA SANTOS GARCIA - UFF
Externo à Instituição - RODOLFO DINO