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Open AccessArticle

Classical Biomarker and Quantitative Extended Diamondoid Analysis Fingerprints for Crude Oils from Deepwater Developments in Block 17, Lower Congo Basin, Angola

1
Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain
2
Department of Geochemistry, Petrology and Geological Exploration, University of Barcelona, 08028 Barcelona, Spain
3
Energy, Environment and Health Research Unity, University Fernando Pessoa, 4249-004 Porto, Portugal
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(19), 7204; https://doi.org/10.3390/ijerph17197204
Received: 5 August 2020 / Revised: 14 September 2020 / Accepted: 28 September 2020 / Published: 1 October 2020
(This article belongs to the Section Environmental Science and Engineering)
The organic geochemistry of six oil samples from the offshore Block 17 (Lower Congo Basin, northwestern Angola) was studied by a combination of classical biomarker and extended diamondoid analyses to elucidate source rock facies, the extent of biodegradation, and thermal maturity. Based on molecular data, oils are interpreted as depicting a mixture of two pulses of hydrocarbon generation probably from the Bucomazi and Malembo formations. Geochemical results also gave evidence of mixing of a lacustrine siliciclastic-sourced oil charge and a second more terrestrially derived oil type in the samples analyzed. A single genetic oil family was identified through hierarchical cluster analysis; however, two groups of oils were identified on the basis of their biodegradation levels using the Peters/Moldowan scale. Lower and upper Malembo oils have a slight depletion and a notable absence of n-alkanes, suggesting PM levels of 1 and 2, respectively. Most molecular maturity parameters of the oil samples suggest a maturity level equivalent to the onset of the peak of the oil generative window. View Full-Text
Keywords: Block 17; mixed oils; QEDA analysis; PM biodegradation scale; Lower Congo Basin Block 17; mixed oils; QEDA analysis; PM biodegradation scale; Lower Congo Basin
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MDPI and ACS Style

Boente, C.; Márquez, G.; Marín, P.; Romero, E.; Rodrigues, C.; Guzmán, M.A. Classical Biomarker and Quantitative Extended Diamondoid Analysis Fingerprints for Crude Oils from Deepwater Developments in Block 17, Lower Congo Basin, Angola. Int. J. Environ. Res. Public Health 2020, 17, 7204.

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