Applications of steranes, terpanes and monoaromatics to the maturation, migration and source of crude oils

Seifert, Wolfgang; Moldowan, J. Michael

doi:10.1016/0016-7037(78)90219-3

Cited by 1,204 publications

(397 citation statements)

References 16 publications

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“…The contents of tricyclic and tetracyclic terpanes in crude oils are closely related to the nature of their organic source (Seifert and Moldowan, 1978) and C 24 tetracyclic terpane/(C 24 tetracyclic terpane þ C 26 tricyclic terpane) have been used to determine the oil-formation organic source. In the Tarim Basin, the marine and non-marine oils are distinguished according to the cross plot of C 24 tetracyclic terpane/(C 24 tetracyclic terpane þ C 26 tricyclic terpane) vs. C 23 tricyclic terpane/(C 23 tricyclic terpane þ C 30 hopane) ratios (Hanson et al, 2000;Duan et al, 2008).…”

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

137

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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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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

137

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“…A mature state for the organic matter in all samples can also be inferred from the C 29 (20S/(20S+20R)) sterane index, which range from 0.54 to 0.65 (Peters et al, 2005). As Tm is unstable during diagenesis and decreases with maturity, the Ts/Tm ratio and Ts/(Ts+Tm) index can also be used as maturation indicators (Seifert and Moldowan, 1978). The Ts/(Ts+Tm) index values (0.40-0.62) and the Ts/Tm values (0.67-1.66) indicate that both Ordovician and Silurian samples are mature ( Table 2).…”

Section: Maturitymentioning

confidence: 99%

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Mustafa

Sephton

Watson

et al. 2015

Marine and Petroleum Geology

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Black shales in the Holy Cross Mountains area of Poland provide a record of environmental change across the Ordovician-Silurian boundary. The changing depositional conditions have generated a variation in organic matter contents above and below the boundary. Investigating the organic constitution of these black shales has the potential to reveal how their organic matter contents were generated and how suitable these rocks and their lateral equivalents may be for exploitation as shale and Silurian rocks, these rocks were buried and subjected to thermal maturation. Rock Eval and Mustafa, K.A., Sephton M.A., Spathopoulos, F., Watson, J.S., Krzywiec, P. Organic geochemical characteristics of black shales across the Ordovician-Silurian boundary in the Holy Cross Mountains, Central Poland, Marine and Petroleum Geology, doi:10.1016/j.marpetgeo.2015.08.018. 2 biomarker thermal maturity parameters all indicate that the organic matter is mature and lies within the oil window. The Ordovician and Silurian shales have direct relevance to recent attempts to discover and exploit shale gas reservoirs in Poland. Our data and interpretations suggest that the relatively low TOC values (<2%) and low maturities for gas generation render these rocks unsuitable for commercial shale gas production. The progressive improvement in conditions for preserving organic matter across the Ordovician-Silurian boundary does, however, leave the possibility that more suitable deposits occur in Early Silurian rocks in other parts of the basin.

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“…Thus, the hopane fingerprint of sludges is typical of highly mature fossil fuels, as evidenced by the predominance of the geologically mature αβS configuration versus the immature ββR configuration (undetected here). Geological maturity parameters such as C 31 -αβ S/R (56%) and Ts/Tm (54%) give average values typical of organic matter which has undergone a high thermal stress during geological times (Seifert and Moldowan, 1978). Therefore, the occurrence of mature hopanes in sludges clearly confirms the input of a fossil fuel contamination.…”

Section: Hopanesmentioning

confidence: 96%

Fossil Fuel Biomarkers in Sewage Sludges: Environmental Significance

Payet

Bryselbout

Morel

et al. 1999

Naturwissenschaften

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Fossil fuel biomarkers, or "molecular fossils", are specific organic substances found in coals, petroleums and sedimentary rocks. They are formed during millions of years of sedimentary burial by geochemical alteration of biological molecules, e.g. cholesterol, under the effect of biodegradation, temperature, pressure and mineral catalysis, to produce geochemically mature molecules, e.g. aromatic steroids (Figure 1). Since fossil fuel biomarkers have a very specific molecular structure betraying fossil fuel sources, such markers should be useful to assess the fossil fuel contamination of various modern media such as soils, plants, waters and modern sediments. Here, the identification of fossil fuel biomarkers of high geothermal maturity in sewage sludges gives evidence for the contamination of sludges by petroleum products. The most likely sources of contamination are contaminated vegetal food, road dust, and soil particles carried by rain water.

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Applications of steranes, terpanes and monoaromatics to the maturation, migration and source of crude oils

Cited by 1,204 publications

References 16 publications

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

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

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Fossil Fuel Biomarkers in Sewage Sludges: Environmental Significance

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