The oleananes: Origin, maturation and limits of occurrence in Southern Nigeria sedimentary basins

Ekweozor, C. M.; Udo, Onkel

doi:10.1016/b978-0-08-037236-5.50019-1

Cited by 38 publications

(34 citation statements)

References 3 publications

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“…An outstanding biomarker in the crude oils is the occurrence of 18α(H) oleanane, which is referred to an input of angiosperms (Ekweozor et al 1979;Ekweozor and Udo 1988;Riva et al 1988;Ekweozor and Telnaes 1990;Nwachukwu et al 1995;Haack et al 2000;Eneogwe and Ekundayo 2003;Eneogwe 2004). The oleanane index after Ekweozor and Telnaes (1990) (oleanane/C 30 hopane) is about 1 for all oils.…”

Section: Hopanes and Steranes As Maturity Parametermentioning

confidence: 97%

Geochemical characterization of crude oils from well ‘X’, Agbada formation, onshore Nigeria

Nyantakyi

Nagre

et al. 2016

Arab J Geosci

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This article characterizes crude oil samples from well 'X' in onshore Nigeria. The objective of this research is to characterize the geochemical features of crude oils. A total of 10 crude oil samples collected from well X, onshore Nigeria were characterized geochemically. The analytical results reveal that all crude oil samples are at the same stage of maturity and correspond to a vitrinite reflectance of about 0.8 % Ro. These oils show minor facies variations probably due to different terrestrial organic matter input indicated by their biomarker distributions. All biodegraded oil samples have similar facies pointing to the same oil with different ranks of biodegradation. The extent of biodegradation for the most degraded oils was from 1 to 4/5. The light hydrocarbon parameters distinguished unaltered from biodegraded oils. Biodegraded oils had higher initial saturations of solution gas, and therefore would lose more gas than black oils during evaporitic fractionation.

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Section: Hopanes and Steranes As Maturity Parametermentioning

confidence: 97%

Geochemical characterization of crude oils from well ‘X’, Agbada formation, onshore Nigeria

Nyantakyi

Nagre

et al. 2016

Arab J Geosci

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“…Contudo, a predominância dos alcanos lineares de alto peso molecular predominam no grupo (C 27, C 29 e C 31 ) observados no fragmentrograma m/z 85 (Figura 4A), com alto grau de imparidade, a alta abundância do hopano C 29 αβ sobre o norhopano C 30 αβ; as elevadas proporções entre os moretanos: trisnorhopano C 27 (17β), e C 30 βα; e a presença do terpano tricíclico C 24 , identifi cados no íon m/z 191, pressupõe uma contribuição predominante de matéria orgânica de origem terrestre para os folhelhos papiráceos (Bray & Evans, 1961). A presença de 18α (H)-Oleanano, composto característico de plantas terrestres da família das angiospermas (Ekweozor & Udo, 1988), ocorre principalmente em bacias terciárias em ambientes deltaicos (Brooks et al, 1969) ou em óleos do Cenozoico e Neocretáceo (Peters et al, 2005).…”

Section: -Depósitos Miocênicos Na Região Do Alto De Olivença Bahia unclassified

Revisão estratigráfica dos depósitos miocênicos aflorantes na região do Alto de Olivença, litoral sul do Estado da Bahia, Brasil

Sanabria¹,

Pereira²,

Antonioli³

2015

Rev. bras. paleontol.

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-STRATIGRAPHIC REVISION OF MIOCENE DEPOSITS OUTCROPPING IN THE ALTO OLIVENÇA REGION, SOUTH COAST BAHIA STATE, BRAZIL. The outcropping deposits on the southern coast of the Bahia State have been commonly described as predominantly continental and lithostratigraphically to the Barreiras Formation. Furthermore, despite its regional approach, this paper presents geological data suggesting a marine infl uence during deposition of these sediments. Faciological and palynological characterization, as well as geochemical studies were integrated to stratigraphically characterize the black shales exposed in the coastal region between Ilhéus and Una, Bahia State. Based on faciological interpretation, it was possible to generate a model of facies association consisting predominantly of subtidal/intertidal deposits. The shallow marine environment is suggested by the sedimentary structures attributed to tidal processes as well as by the presence of marine palynomorphs (microfaraminifers test linings) along with woody organic material. The presence of the species Lanagiopollis crassa, Multiareolites formosus, Deltoidospora adriennis, Retimonocolpites cf. R. maximus, and Psilatricolpites divisus suggests that the outcropping shales were deposited in the Miocene, within a progressive shallowing trend, in the context of a highstand system tract, which would have developed thick shallow water shale packages interspersed with tidal sand bars, in a tide-dominated estuarine system. Key words: marine palynomorph, stratigraphy, Barreiras Formation, Rio Doce Formation, biomarkers.RESUMO -Os depósitos afl orantes no litoral sul do Estado da Bahia têm sido comumente descritos como depósitos predominantemente continentais associados à Formação Barreiras. Embora ainda de caráter regional, o presente trabalho apresenta dados que sugerem uma infl uência marinha durante a deposição destes sedimentos. Análises faciológica, palinológica e geoquímica foram integradas com o objetivo de caracterizar estratigrafi camente os sedimentos afl orantes ao longo da faixa litorânea entre as cidades de Ilhéus e Una no Estado da Bahia. Com base nas informações faciológicas foi possível reconhecer uma associação de fácies indicativa de depósitos de inframaré/intermaré em contexto costeiro. O ambiente deposicional é sugerido pelas estruturas sedimentares atribuídas aos processos de maré, bem como pela presença de palinomorfos marinhos (microforaminíferos) junto com material orgânico lenhoso. A presença das espécies: Lanagiopollis crassa, Multiareolites formosus, Deltoidospora adriennis, Retimonocolpites cf. R. maximus, e Psilatricolpites divisus, sugerem que os folhelhos afl orantes foram depositados no Mioceno. Esta deposição ocorreu dentro de uma progressiva tendência de raseamento, no contexto de um trato de sistema de mar alto, onde teriam sido desenvolvidos espessos pacotes de sedimentos fi nos de água rasa, intercalados com barras arenosas num sistema estuarino.Palavras-chave: palinomorfos marinhos, estratigrafi a, Formação Barreiras, Formação Rio...

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“…Oleanane mainly originates from various terrigenous predecessors (Ekweozor and Udo, 1988;Riva et al, 1988;Fu and Sheng, 1989). It is a useful indicator reflecting the input of higher plants, especially in Cretaceous and younger strata (Peters et al, 2005).…”

Section: Effective Indices Of Biomarkersmentioning

confidence: 99%

Tracing early-charged oils and exploration directions for the Wenchang A sag, western Pearl River Mouth Basin, offshore South China Sea

Cheng

Tian

Huang³

et al. 2013

Organic Geochemistry

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The oleananes: Origin, maturation and limits of occurrence in Southern Nigeria sedimentary basins

Cited by 38 publications

References 3 publications

Geochemical characterization of crude oils from well ‘X’, Agbada formation, onshore Nigeria

Geochemical characterization of crude oils from well ‘X’, Agbada formation, onshore Nigeria

Revisão estratigráfica dos depósitos miocênicos aflorantes na região do Alto de Olivença, litoral sul do Estado da Bahia, Brasil

Tracing early-charged oils and exploration directions for the Wenchang A sag, western Pearl River Mouth Basin, offshore South China Sea

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