Rifted margin source rock deposition: a carbon isotope and biomarker study of a West African lower cretaceous “Lacustrine” section

Burwood, R.; Leplat, P.; Mycke, B.; Paulet, J.

doi:10.1016/0146-6380(92)90026-t

Cited by 74 publications

(20 citation statements)

References 18 publications

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“…terpane/(C 23 tricyclic terpane + C 30 hopane) ratios Zhang et al, 2000). Previous data have indicated that in general, C 25 /C 26 tricyclic terpane and C 25 tricyclic terpane/C 24 tetracyclic terpane ratios greater than 1 were associated with marine oils, whereas the values less than 1 inferred nonmarine oils (Burwood et al, 1992;Hanson et al, 2000). The two values of nonmarine crude oils from the Xifeng oilfield are in the range of 0.25-0.50 and 0.38-0.67, respectively (Table 4), supporting the effectiveness of these parameters as indicators of crude oil genesis.…”

Section: Source and Formation Environment Of Crude Oilsmentioning

confidence: 96%

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Duan

Wang

Chen

et al. 2008

Journal of Asian Earth Sciences

157

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Section: Source and Formation Environment Of Crude Oilsmentioning

confidence: 96%

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Duan

Wang

Chen

et al. 2008

Journal of Asian Earth Sciences

157

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“…5a). Previous data have indicated that in general, C 25 /C 26 tricyclic terpane (C 25 /C 26 TT) and C 25 tricyclic terpane/C 24 tetracyclic terpane (C 25 TT/C 24 TeT) ratios > 1 were associated with marine oils, whereas the values < 1 inferred nonmarine oils (Burwood et al, 1992;Hanson et al, 2000). It can be shown that the terrigenous oils, freshwater lacustrine oils, saline lacustrine and marine oils are well distinguished according to the cross plot of C 25 /C 26 TT vs. C 25 TT/C 24 TeT ratios (Fig.…”

Section: Source Dependent Parameters Based On the Distribution Tricycmentioning

confidence: 99%

Geochemical application of tricyclic and tetracyclic terpanes biomarkers in crude oils of NW China

Tao

Wang

et al. 2015

Marine and Petroleum Geology

136

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a b s t r a c tComposition and distribution of tricyclic terpanes, tetracyclic terpanes and hopane in crude oils from Tarim, Turpan, Ordos and Qaidam basins, NW China, were investigated, and some new source dependent parameters were developed and evaluated. C 19 and C 20 tricyclic terpanes are more abundant in terrigenous oils, with C 24 tetracyclic terpane dominant. Relatively higher carbon number tricyclic terpanes, especially C 23 tricyclic terpane, are often the dominant homologues in crude oils from saline lacustrine and marine sources. On the whole, the relative content of C 23 tricyclic terpane of crude oils follow the order of saline lacustrine oils > marine oils > freshwater lacustrine oils > terrigenous oils for C 19e23 tricyclic terpane. Some new parameters based on the tricyclic/hopane and tetracyclic/tricyclic terpane as well as tetracyclic/hopane ratios, could be used to distinguish the oils and source rocks with similar maturity deposited in different sedimentary environments.

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“…However, past studies of lacustrine source-rocks showed that a variation of medium-heavy paraffins concentration (i.e. n-C 14þ /n-C 6þ ) may be encountered within a single source-rock formation (Burwood, 1999;Burwood et al, 1992;Gaglianone and Trindade, 1988;Tissot and Welte, 1984). Furthermore, as lakes contain much smaller volumes of water and sediments than oceans, their environments is much more sensitive to climate, accommodation and river discharge changes (Bohacs et al, 2000;Johnson et al, 1987;Perlmutter and Matthews, 1990).…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironmental control on primary fluids characteristics of lacustrine source rocks in the Autun Permian Basin (France)

Garel¹,

Béhar²,

Schnyder³

et al. 2017

Bull. Soc. géol. Fr.

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-The Autunian (Late Gzhelian-Sakmarian, ∼295 Ma) of the Autun Basin (Saône-et-Loire, France) is well known for its lacustrine oil-shales and boghead that were exploited during the 19th and 20th centuries. A study of the kerogen geochemistry, palynofacies, hydrocarbon (HC) distribution of pyrolysates and kinetics on these organic-rich sediments gave indications on the control of lacustrine primary fluid characteristics by palaeoenvironmental settings. Palynofacies results have shown a Botryococcus algae dominance in the boghead, whereas the oil-shales were dominated either by a mixing of terrestrial particles and lacustrine phytoplanktonic/bacterial organic matter (OM), or by a lacustrine OM that suffered biodegradation within the water column. During the Autunian, an increasing trend of degraded lacustrine OM concentration is observed in the successive oil-shales. Geochemical and kinetics analyses showed that, except for the boghead, hydrogen index values were < 700 mg/g TOC and activation energies diagram showed multi-energetic profiles, unexpected for such a lacustrine OM. Along with pyrolysates primary fluids ones, these results unraveled two groups of oil-shale samples. On the one hand, samples dominated by well-preserved lacustrine and terrestrial OM produced primary fluids dominated by n-alkanes with (n-C 6 -n-C 14 ) /n-C 14þ n-alkanes ratio depending on the proportion of terrestrial OM. They were only encountered in the three oldest oil-shales. On the other hand, the HC profile of fluids originating from samples dominated by degraded lacustrine OM, which was obtained for the first time in this study, show low n-alkanes concentrations and a relatively prominent hump. These samples were only present in the three youngest oilshale levels. Finally, the boghead showed a link between strong concentration of the Pila genus of Botryococcus algae and a primary fluid dominated by n-C 6 -n-C 14 n-alkanes. By comparing these data with published palaeoenvironmental studies, it appears that the kind of dominant OM, and thus the HC distribution of primary fluids, is controlled by the lake level: a lower depth preventing the settlement of anoxic conditions in the bottom waters, and the subsequent good preservation of the OM. During the Autunian, the lake level decreased, consequence of a reduced tectonic activity and of the beginning of a dryer period. Finally, these changes will have caused a strong decrease of the nutrient influx to the lake, favoring the bloom of Botryococcus algae that accumulated to form the boghead. cinétiques ont montré que, excepté pour le boghead, les valeurs d'index d'hydrogène étaient < 700 mg/g COT et les énergies d'activation montraient des profils pluri-énergétiques, inhabituels pour une MO lacustre. Ajoutés à ceux des fluides primaires de pyrolysats, ces résultats ont mis en évidence deux groupes d'échantillons de schistes-bitumineux. Le premier est marqué par une dominance de la MO lacustre et terrestre bien préservée et produit des fluides primaires dominés par les n-alcanes ave...

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Rifted margin source rock deposition: a carbon isotope and biomarker study of a West African lower cretaceous “Lacustrine” section

Cited by 74 publications

References 18 publications

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Geochemical application of tricyclic and tetracyclic terpanes biomarkers in crude oils of NW China

Palaeoenvironmental control on primary fluids characteristics of lacustrine source rocks in the Autun Permian Basin (France)

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