Optically Active Spirotriterpane in Petroleum Distillates

Hills, I. R.; Smith, George W.; Whitehead, E. V.

doi:10.1038/219243a0

Cited by 35 publications

(6 citation statements)

References 24 publications

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“…Under our GC-conditions 17a(H), 21b(H)-22S-25-norhomohopane co-elutes with oleananes and 17a(H), 21b(H)-22R-25-norhomohopane coelutes with 17a(H), 21b(H)-hopane. In a case like this, the various rearranged oleananes (peaks 3,8 and 9; Hills et al, 1968;Smith et al, 1995;Nytoft et al, 2010 and references therein) which are formed from the same 3-oxygenated oleanoids are more reliable markers for higher plant input. They elute much earlier than the oleananes (peaks 15 and 16) and can be identified using GC-MS-MS ( Fig.…”

Section: Bitumen Biomarkersmentioning

confidence: 95%

Bitumen biomarkers in the Mid-Proterozoic Ilímaussaq intrusion, Southwest Greenland – A challenge to the mantle gas theory

Laier

Nytoft

2012

Marine and Petroleum Geology

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Section: Bitumen Biomarkersmentioning

confidence: 95%

Bitumen biomarkers in the Mid-Proterozoic Ilímaussaq intrusion, Southwest Greenland – A challenge to the mantle gas theory

Laier

Nytoft

2012

Marine and Petroleum Geology

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“…Four of the five rings B, C, 0 and E appear to be sixmembered with trans-ring fusions and chair configuration. The configuration of the fIfth ring is now established (R value = 14.9 percent) and we hope to publish the detailed structure of hydrocarbon "E" when the present investigation, which is proceeding without the incorporation of a heavy atom, is complete [206].…”

Section: (191)mentioning

confidence: 99%

Crude Petroleum

Speers

Whitehead

1969

Organic Geochemistry

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“…Of the triterpanoids unrelated to the hopanes, Rullk6tter et al (1982) finally confirmed the presence of lupanes in Tertiary sediments from west Greenland and from the Gulf of Suez, although Hills & Whitehead (1966) had first tentatively identified the compounds in Nigerian crude oils. The Greenland occurrence of bisnorlupanes possibly formed as a result of microbial action during early diagenesis.…”

Section: Pentacyclic Triterpanoidsmentioning

confidence: 99%

“…In a specific study of triterpanes in crude oils from the Mahakam Delta, Grantham et al (1983) recognized the triterpanes 18~(H)-oleanane and 'compound J' (Hills & Whitehead 1966), both of which point strongly to the presence of terrestrial organic matter in the source rocks. Three unusual C30 pentacyclic compounds (but no further identification) also occurred in some of the crudes.…”

Section: The Far Eastmentioning

confidence: 99%

“…In the Nigerian crudes only 18~(H)-oleanane and 'compound J' are present, with no trace of the C30 pentacyclic hydrocarbons found by Grantham et al (1983) in Far East crudes, testifying to yet another variation of the resin source. Other triterpanes have been identified (Hills et al 1968); for example, relatively large abundances of the very common 17~(H),21 fl(H)-hopfines are present in Nigerian crudes compared with Far Eastern crudes.…”

Section: The Niger Deltamentioning

confidence: 99%

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Recent advances in organic petrology and organic geochemistry: an overview with some reference to ‘oil from coal’

Murchison¹

1987

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A B S T R A C T : Although organic petrology and organic geochemistry differ greatly in age, it is during the last 25 years that there has been an almost exponential expansion of research and literature in both fields. Much of the support for the developments that have taken place has come from industrial sources. The steel industry underpinned applied coal petrology in the 1960s to improve carbonization practice related to the production of metallurgical cokes. The petroleum industry has generally supported both organic petrology and organic geochemistry, with a principal aim of improving methods to assess rank (level of maturity) and type (source input) of both coals and kerogens. As precise a determination as possible of both these parameters is as essential in hydrocarbon-prospect appraisal as it is in the raising of coke quality.In organic petrology the construction of fully automated microscope fluorometric systems has been a major advance that has helped to define more precisely the low maturity levels that exist prior to and through most of the 'oil window'. The same optical systems have not been so successful in producing an acceptable single petrographic typing method for kerogens. Used in conjunction with chemical methods, however, microscope fluorometry has certainly contributed substantially towards more precise kerogen typing, allowing more satisfactory discrimination of the liptinite macerals, several of which are known 'oil formers'. Another group of potentially economic rocks, the oil shales, has also been successfully classified, principally through fluorescence methods.Within organic geochemistry, the growth and application of analytical pyrolysis methods have been of relevance and importance. While not capable of high chemical resolution, bulkflow pyrolysis systems (cf 'Rock-Eval') are now widely used to gain a preliminary estimation of maturity level, source input and generating potential of source rocks by the screening of large numbers of samples. The most important single advance in the pyrolysis field, however, has probably been the evolution of a typing method, which, although it utilizes information from both petrography and bulk-flow pyrolysis has, as its essential core, quantitative highresolution pyrolysis data. Kerogens can now be subdivided into eight different end-members and referred to specific depositional environments.When these fluorometric and pyrolysis data are combined with information from biological-marker studies, which have expanded rapidly as a result of the advances in computerized gas chromatography-mass spectrometry over the past decade, it is not surprising that hydrocarbon exploration efforts are better rewarded. There is now less doubt that terrestrial sources have generated economic accumulations of oil. The principal areas where oil has been generated from land-plant material are the Australian and the Canadian Frontier sedimentary basins, and the Chinese intermonbane basins, but other similar environments have been identified and no doubt other basins with te...

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Optically Active Spirotriterpane in Petroleum Distillates

Cited by 35 publications

References 24 publications

Bitumen biomarkers in the Mid-Proterozoic Ilímaussaq intrusion, Southwest Greenland – A challenge to the mantle gas theory

Bitumen biomarkers in the Mid-Proterozoic Ilímaussaq intrusion, Southwest Greenland – A challenge to the mantle gas theory

Crude Petroleum

Recent advances in organic petrology and organic geochemistry: an overview with some reference to ‘oil from coal’

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