Occurrence and origin of “ultralaminar” structures in “amorphous” kerogens of various source rocks and oil shales

Largeau, Claude; Derenne, Sylvie; Casadevall, E.; Berkaloff, Claire; Corolleur, M.; Lugardon, Bernard; Raynaud, J.F.; Connan, Jacques

doi:10.1016/0146-6380(90)90125-j

Cited by 100 publications

(33 citation statements)

References 20 publications

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“…The orange AOM is interpreted as resulting from natural vulcanization, a.k.a. sulfurization (reaction with sulfides and polysulfides, see below), whereas brown AOM is interpreted to result from selective preservation of resistant biopolymers (selective oxidation of metabolizable constituents; Boussafir et al, 1994Boussafir et al, , 1995aDerenne et al, 1991;Largeau et al, 1990;Mongenot et al, 1997). Natural sulfurization is an early diagenetic process leading to the inter-or intramolecular incorporation of reduced inorganic sulfur species into low-molecular-weight functionalized lipids resulting in the formation of resistant high molecular weight abiotic "geopolymers" (Tegelaar et al, 1989).…”

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Hatem¹,

Tribovillard²,

Averbuch³

et al. 2017

Bull. Soc. géol. Fr.

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-We studied a potential petroleum source rock deposited in a clastic-dominated ramp environment: the Argiles de Châtillon Formation (Kimmeridgian-Tithonian, Boulonnais area, northern France). The formation was deposited along a proximal-distal gradient on this ramp affected by synsedimentary fault movements. A sedimentological, mineralogical and geochemical study was conducted to decipher the distribution patterns of sedimentary parameters along such a depth increase over the ramp. It comes out that smectite distribution unexpectedly mimics the lateral depth evolution despite the good floatability of the mineral. It is also observed that the Argiles de Châtillon could accumulate noticeable amounts of organic matter in spite of paleoenvironmental conditions that were not specifically prone to organic matter preservation and burial (sedimentation rate, mineral particle grain size, productivity, oxygenation level...). Conversely, reactive iron, when being present in limited abundance, must have allowed sulfide ions to react with organic molecules instead of forming iron sulfides, which fostered organic matter preservation and accumulation. This protecting role of organic sulfide incorporation (additional to other favorable factors) cannot exist if reactive iron is relatively abundant. Lastly, our results (still fragmentary) suggest that smectite minerals could carry reactive iron, which would have occasionally hampered organic-matter preservation.Keywords: Kimmeridgian-Tithonian / Boulonnais / organic matter / petroleum source rocks / geochemistry / clay minerals Résumé -Importance des variations latérales discrètes dans les apports détritiques, observées dans des faciès de rampe sédimentaire riches en matière organique (Jurassique supérieur du Boulonnais). La formation des Argiles de Châtillon (Kimméridgien-Tithonien, Boulonnais) est un bon analogue géologique de roche mère pétrolière déposée en contexte de rampe clastique. Ces dépôts se sont mis en place le long d'un transect proximal-distal sur une rampe affectée par des mouvements tectoniques synsédimentaires. Pour mettre en évidence et comprendre la distribution des paramètres sédimentaires en fonction de l'évolution de la profondeur, une étude sédimentologique, minéralogique et géochimique fut entreprise. Il en ressort que la distribution de la smectite au sein du cortège argileux respecte ce gradient, malgré la flottabilité reconnue de ce minéral. Il apparaît également que les Argiles de Châtillon ont pu accumuler des quantités sensibles de matière organique malgré un contexte de dépôt peu favorable à la préservation et à l'enfouissement de celle-ci. En revanche, le fer réactif, quand il était présent en faible quantité dans les sédiments, a pu permettre aux ions sulfures de réagir avec les molécules organiques, plutôt que de former des sulfures de fer. Cette sulfuration a pu accroître la résistance de la matière organique à la dégradation microbienne, ce qui explique la bonne préservation du carbone organique. Ce rôle protecteur de la vulcanisation...

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Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Hatem¹,

Tribovillard²,

Averbuch³

et al. 2017

Bull. Soc. géol. Fr.

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“…This is the only one-to-one correspondence so far established between a series of biomarkers and a living organism. C 34 botryococcane, (91), was first discovered in two Sumatran oils in a concentration (up to 1.4% of total crude oil) markedly higher than ever observed before for any individual biomarker (96,98). This alkane showed the same carbon skeleton as the C 34 botryococcene (16) occurring in large amount in several strains of the B race of B. braunii.…”

Section: Role Of B Braunii Hydrocarbons As Biomarkersmentioning

confidence: 86%

Lipids and Macromolecular Lipids of the Hydrocarbon-rich Microalga Botryococcus braunii. Chemical Structure and Biosynthesis. Geochemical and Biotechnological Importance

Metzger

Largeau

Casadevall

1991

Fortschritte Der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products

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“…biomacromolecules) (Tegelaar et al, 1989;Largeau et al, 1990;Derenne et al, 1991;Lichtfouse et al, 1998a). The ubiquitous occurrence of lipid biomarker products like hopanes and steranes in kerogen and petroleum (Tissot and Welte, 1984) as well as in specific sedimentary environments (such as the studied Kiritimati mat) demonstrates the existence of the first process.…”

Section: Sources Of Alkylated Structures In Protokerogen and Lipids Imentioning

confidence: 99%

Organic matter preservation in the carbonate matrix of a recent microbial mat – Is there a ‘mat seal effect’?

Blumenberg

Thiel

Reitner

2015

Organic Geochemistry

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Occurrence and origin of “ultralaminar” structures in “amorphous” kerogens of various source rocks and oil shales

Cited by 100 publications

References 20 publications

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Lipids and Macromolecular Lipids of the Hydrocarbon-rich Microalga Botryococcus braunii. Chemical Structure and Biosynthesis. Geochemical and Biotechnological Importance

Organic matter preservation in the carbonate matrix of a recent microbial mat – Is there a ‘mat seal effect’?

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