Organic geochemistry and petrography of Tertiary coals and carbonaceous shales from Argentina

Villar, Héctor J.; Püttmann, Wilhelm; Wolf, Monika

doi:10.1016/0146-6380(88)90283-5

Cited by 40 publications

(4 citation statements)

References 18 publications

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“…This scenario best matches the calibration data and is also consistent with the geological evolution and with measured Eocene coal samples from the Rio Turbio Formation in the Santa Cruz Province (0.5-0.58%VR r ; Villar et al,1988) Thermo-chronological measurements on outcrop samples from the western Magallanes Basin (Fosdick et al, 2014) indicated maximum burial between 54 and 46 Ma, corresponding to palaeo temperatures for the Maastrichtian Dorotea Formation of 164-180 °C. Based on this information, a "Scenario 4" was created, assuming 800 m of erosion since the late Miocene and a total erosion of 2000 m for the Eocene.…”

Section: Sensitivity Analysessupporting

confidence: 85%

Burial, Temperature and Maturation History of the Austral and Western Malvinas Basins, Southern Argentina, Based on 3d Basin Modelling

Sachse

Anka

Littke

et al. 2016

Journal of Petroleum Geology

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Section: Sensitivity Analysessupporting

confidence: 85%

Burial, Temperature and Maturation History of the Austral and Western Malvinas Basins, Southern Argentina, Based on 3d Basin Modelling

Sachse

Anka

Littke

et al. 2016

Journal of Petroleum Geology

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“…Benzohopanes may be ubiquitous components, especially abundant in confined and reducing environments. 86,87 The predominance of the C 34 counterpart among benzohopanes has been reported in evaporitic rock samples; however, the carbon isotope depletion of C 32 to C 35 benzohopanes in oils is tentatively attributed to migration effects of hydrocarbons. 84 4.2.2.…”

Section: Samples and Methodsmentioning

confidence: 99%

Origin and Geochemical Implications of Hopanoids in Saline Lacustrine Crude Oils from Huanghekou East Sag and Laizhouwan Northeastern Sag, Bohai Bay Basin

et al. 2021

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A suite of low-mature crude oils (five high-sulfur oils and six low-sulfur oils) from the Huanghekou and the Laizhouwan Sags, Bohai Bay Basin, are analyzed to investigate the fate of the hopanoids. Abundant hopanes, such as secohopanes, 25-norhopanes, benzohopanes, aromatized secohopanes, and sulfide hopanes, are identified, and their carbon isotope compositions are determined. Varying 13C isotope values of C31 hopane (−38.7–34.0‰) and C29‑30 hopanes (−38.5–31.5‰) suggest different bacterial sources of these compounds. The presence of 25-norhopanes with enriched heavy carbon isotopes in severely biodegraded oils suggests that they are microbially mediated products. The detection of the isotopically depleted C29 and C30 D-ring-8,14-secohopanes (−45.6–41.2‰) indicates that secohopanes are from methane-oxidizing bacteria (methanotrophs). The presence of isorenieratane, lower aryl isoprenoid ratios, and a good correlation between the sulfur content and the gammacerane index indicate the presence of green sulfur bacteria (Chlorobiaceae) under photic zone euxinic conditions. Water column stratification results in good preservation of the organic matter, and it is in favor of diversity of aquatic microorganisms. The ratios of C35/C34 sulfide hopane, C35 sulfide hopane-2/C35 sulfide hopane-1, and C35/C34 benzohopane are influenced by the reducing environments in this region. In addition, the D-ring monoaromatized 8,14-secohopanoid/(D-ring monoaromatized 8,14-secohopanoid + benzohopanes) and C31–C35 secomoretanes/secohopanes are affected by the maturity. We hypothesize that the reducing environments and thermal effects are important markers for the hopanoid transformation, including the incorporation of inorganic sulfur in substituting functional groups, cyclizing, aromatizing, and opening ring C of the hopanoids.

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“…17α (H) -homohopane ratios are essential as a paleoclimate indicator (Waples and Machihara, 1991). Decrease in the C 31 -C 35 extended hopanes reflects a clastic facies, and the C 31 hopane rate can be correlated with peat and coal (Villar et al, 1988). Clastic materials and peat-forming environments both imply materials derived from lacustrine terrains.…”

Section: Peakmentioning

confidence: 95%

Relationships between coal-quality and organic-geochemical parameters: A case study of the Hafik coal deposits (Sivas Basin, Turkey)

Erik

Sancar

2010

International Journal of Coal Geology

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Organic geochemistry and petrography of Tertiary coals and carbonaceous shales from Argentina

Cited by 40 publications

References 18 publications

Burial, Temperature and Maturation History of the Austral and Western Malvinas Basins, Southern Argentina, Based on 3d Basin Modelling

Burial, Temperature and Maturation History of the Austral and Western Malvinas Basins, Southern Argentina, Based on 3d Basin Modelling

Origin and Geochemical Implications of Hopanoids in Saline Lacustrine Crude Oils from Huanghekou East Sag and Laizhouwan Northeastern Sag, Bohai Bay Basin

Relationships between coal-quality and organic-geochemical parameters: A case study of the Hafik coal deposits (Sivas Basin, Turkey)

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