Oil Family Typing, Biodegradation and Source Rock Affinity of Liquid Petroleum in the Danish North Sea

Petersen, Henrik I.; Hertle, M.; Juhasz, Atilla; Krabbe, Helle

doi:10.1111/jpg.12645

Cited by 23 publications

(16 citation statements)

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“…(v) the sulphur content is on average 0.07 wt%. The mixed oils/condensates with a clear coaly contribution (oil families 5D/E-B and 4B-D/E; Petersen et al, 2016) can likewise be identified by these geochemical parameters, although the characteristics are slightly less pronounced than in oils belonging to family 6D/E-F) ( Fig. 5; Table 1).…”

Section: Composition and Occurrence Of Coaly Hydrocarbons Oilmentioning

confidence: 86%

“…A comprehensive and detailed classification of oil types (oil family typing) in the Danish Central Graben based on evaluation of organofacies-specific biomarkers, stable carbon isotopes and principal component analysis (PCA) was recently published by Petersen et al (2016). In summary, the Danish Central Graben contains several oil families of which the majority can be typed to different facies of the marine shales of the Farsund Formation.…”

Section: Composition and Occurrence Of Coaly Hydrocarbons Oilmentioning

confidence: 99%

“…Very heavy δ 13 C propane isotope value (-20‰), heavy δD methane (-155‰), high i-butane/n-butane ratio (i/nC4) Likely high mature Middle Jurassic coaly Bryne and Lulu Fms; potentially cracked gas *Only one sample, limited data Oil families after Petersen et al (2016) coaly-sourced fl uids encountered in the Danish Central Graben, but the Lulita oilfi eld stands out. As shown above, the source rock potential of the coal-bearing successions in the West Lulu-2 and Lulita-1X wells are of almost similar quality, although the upper part in Lulita-1X contains more oil-prone intervals, and the source rocks would basically generate the same fl uid phases (same Condensate-Gas Ratio, CGR) under the same thermal conditions.…”

Section: Most Likely Coaly Source Rocksmentioning

confidence: 99%

“…The primary source rocks in the North Sea are the Upper Jurassic -lowermost Cretaceous marine shales of the Farsund, Mandal and Kimmeridge Clay Formations and equivalents (Damtoft et al, 1992;Cornford, 1998;Ineson et al, 2003;Justwan et al, 2005;Petersen et al, 2010Petersen et al, , 2016Petersen et al, , 2017. In the Danish Central Graben, these world-class source rocks have charged the major chalk fields which account for the vast majority of the daily production of approximately 150,000 brl of oil and 3.9 billion Sm 3 (c. 71,000 brl oil-equivalent) of gas (Danish Energy Agency, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Petroleum System) ( Fig. 1b) (Petersen et al, , 2000(Petersen et al, , 2011(Petersen et al, , 2016Petersen and Brekke, 2001;Odden, 1999;Carr and Petersen, 2004). In contrast to the oils generated from the marine shales, these coaly sourced hydrocarbons are recognised by a typical terrigenous geochemical composition such as Pr/Ph ratios generally >3, sterane C 27 /C 29 ratios around unity or less, waxy n-alkane distributions, and relatively heavy stable carbon isotopes.…”

Section: Introductionmentioning

confidence: 99%

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A Review of the Coaly Source Rocks and Generated Petroleums in the Danish North Sea: An Underexplored Middle Jurassic Petroleum System?

Petersen

Hertle

2018

Journal of Petroleum Geology

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This paper reviews the Middle Jurassic petroleum system in the Danish Central Graben with a focus on source rock quality, fluid compositions and distributions, and the maturation and generation history. The North Sea including the Danish Central Graben is a mature oil province where the primary source rock is composed of Upper Jurassic – lowermost Cretaceous marine shales. Most of the shale‐sourced structures have been drilled and, to accommodate continued value creation, additional exploration opportunities are increasingly considered in E&P strategies. Triassic and Jurassic sandstone plays charged from coaly Middle Jurassic source rocks have proven to be economically viable in the North Sea. In the Danish‐Norwegian Søgne Basin, coal‐derived gas/condensate is produced from the Harald and Trym fields and oil from the Lulita field; the giant Culzean gas‐condensate field is under development in the UK Central North Sea; and in the Norwegian South Viking Graben, coal‐derived gas and gas‐condensate occur in several fields. The coaly source rock of the Middle Jurassic petroleum system in the greater North Sea is included in the Bryne/Lulu Formations (in Denmark), the Pentland Formation (in the UK), and the Sleipner and Hugin Formations in Norway. In the Danish Central Graben, the coal‐bearing unit is composed of coals, coaly shales and carbonaceous shales, has a regional distribution and can be mapped seismically as the ‘Coal Marker’. The coaly source rocks are primarily gas‐prone but the coals have an average Hydrogen Index value of c. 280 mg HC/g TOC and values above 300 mg HC/g TOC are not uncommon, which underpins the coals' capacity to generate liquid hydrocarbons (condensate and oil). The coal‐sourced liquids are differentiated from the common marine‐sourced oils by characteristic biomarker and isotope compositions, and in the Danish Central Graben are grouped into specific oil families composed of coal‐sourced oil and mixed oils with a significant coaly contribution. Similarly, the coal‐sourced gases are recognized by a normally heavier isotope signature and a relatively high dryness coefficient compared to oil‐associated gas derived from marine shales. The coal‐derived and mixed coaly gases are likewise assigned to well‐defined gas families. Coal‐derived liquids and gas discoveries and shows in Middle Jurassic strata suggest that the coaly Middle Jurassic petroleum system has a regional distribution. A 3D petroleum systems model was constructed covering the Danish Central Graben. The model shows that present‐day temperatures for the Middle Jurassic coal source rock ('Coal Marker') are relatively high (>150 °C) throughout most of the Danish Central Graben, and expulsion of hydrocarbons from the ‘Coal Marker’ was initiated in Late Jurassic time in the deep Tail End Graben. In the Cretaceous, the area of mature coaly source rocks expanded, and at present day nearly the whole area is mature. Hydrocarbon expulsion rates were low in the Paleocene to Late Oligocene, followed by significant expulsion in the Miocene up...

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Section: Composition and Occurrence Of Coaly Hydrocarbons Oilmentioning

confidence: 86%

Section: Composition and Occurrence Of Coaly Hydrocarbons Oilmentioning

confidence: 99%

Section: Most Likely Coaly Source Rocksmentioning

confidence: 99%