Banca de DEFESA: KAREN CRIVELLANI

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : KAREN CRIVELLANI
DATA : 29/09/2020
HORA: 09:00
LOCAL: defesa remota
TÍTULO:

HYDROPYROLYSIS OF ASPHALTENES AND RECOVERY OF GEOCHEMICAL INFORMATION - OIL FROM THE PIRAMBÓIA FORMATION, PARANÁ BASIN, BRAZIL

PALAVRAS-CHAVES:

Biomarkers, maturity, pyrolysis, kerogen.

PÁGINAS: 223
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Geologia
ESPECIALIDADE: Geoquímica
RESUMO:

Hydrous Pyrolysis technique is a hydrothermal experiment widely used in the oil industry. Based on principles that simulate the formation of oil in laboratory, this technique can be applied to asphaltenes to obtain biomarkers that have been destroyed by the effects of biodegradation. In order to reconstruct the paraffinic fraction of biodegraded oils and to permit correlation with its source rock, the main objective of this work is to perform asphaltenes hydrous pyrolysis experiments - extracted and precipitated from three Pirambóia Formation tar sands samples (70 to 85% of resins and asphaltenes), and immature organic-rich shale sample (Total Organic Carbon = 6.16 wt%, R_o = 0.42%) of Irati Formation (Paraná Basin, in the State of São Paulo, Brazil). The geochemical and petrographic parameters calculated for the pyrolyzed products are available in this work, and offer new understandings about the Irati-Pirambóia Petroleum System (!), and about the physical-chemical transformations of organic matter under hydrous pyrolysis conditions. The calculated geochemical ratios indicate that Pirambóia Formation oil origin is associated with an anoxic sedimentation environment (Pr/Fi<1), with strong evidence of anaerobic bacteria precursors (Hop/Est>1) in saline environment (Tric/Hop, C₂₄ tetracyclic/C₂₆ tricyclic, Gam/Hop). The salinity is probably related to the stratification of the water column and other different geological and environmental conditions that occurred during the deposition of the Irati Formation at the end of the Permian. The percentages of C₂₇, C₂₈ and C₂₉ steranes exhibit a very expressive geochemical correlation between the oils expelled by the hydrous pyrolysis of asphaltenes and kerogen, probably indicating the predominance of algal input / superior terrestrial vegetables. Maturity biomarkers parameters values of 22S/(22S + 22R) C₃₂ 17α-hopano, S/(S+R) (C₂₉ ααα) and ββ/(αα+ββ) (C₂₉) ratios, did not show significant differences with the increase of the thermal stress experiments. Concluding, the structure of asphaltenes and kerogen can be thermally altered under hydrous pyrolysis conditions and generate expelled oils, releasing physically trapped or chemically bound biomarkers in their respective structures.

MEMBROS DA BANCA:
Presidente - 6285989 - ANTONIO FERNANDO DE SOUZA QUEIROZ
Externo à Instituição - JOALICE DE OLIVEIRA MENDONÇA
Externo à Instituição - JOÃO GRACIANO MENDONÇA FILHO
Interno - 1649202 - LEONARDO SENA GOMES TEIXEIRA
Interno - 2322888 - OLIVIA MARIA CORDEIRO DE OLIVEIRA
Externo à Instituição - TAIS FREITAS DA SILVA