Variation and significance of the C27 and C28 triterpane content of a North Sea core and various North Sea crude oils

Organic geochemistry in exploration of the Northern North Sea

“…As already stated, the Kimmeridge Clay Formation is believed to be the prime source of the majority of hydrocarbon accumulations in the Northern North Sea. Oil-to-source correlations by Fuller (1975), Oudin (1976), Grantham et al (1980), Van den Bark and Thomas (1980), Bissada (1983) and Reitsema (1983) confirm this observation.…”

Geochemical characterisation and genetic origin of oils and condensates in the South Viking Graben, Norway

“…This observation is supported by low ratios of C 34 over C 35 homohopanes, also associated with reducing conditions (Peters and Moldowan, 1991) and the occurrence of bisnorhopane. 17a(H),21b(H)-28,30-bisnorhopane is often called a marker for Upper Jurassic sourced oils in the North Sea (Grantham et al, 1980;Huc et al, 1985;Dahl, 2004) and although its exact origin is still under debate, it appears to be associated with anoxic environments of deposition (Katz and Elrod, 1983;Curiale and Odermatt, 1989). The Draupne Formation appears to be dominated by marine algal organic matter, as reflected by dominance of C 27 regular steranes over the C 29 homologues (Huang and Meinschein, 1979) and the strong dominance of C 30 hopane over C 30 moretane (Isaksen and Bohacs, 1995).…”

C27–C30 neohop-13(18)-enes and their saturated and aromatic derivatives in sediments: Indicators for diagenesis and water column stratification

“…Several authors have associated the presence of C 28 DNH in sediments and oils with production by anaerobic bacteria in an anoxic depositional environment (e.g., Grantham et al, 1980;Katz and Elrod, 1982;Mello et al, 1988Mello et al, , 1989Schoell et al, 1992;Nytoft et al, 2000). High contents of the C 28 DNH occur in pelagic carbonates deposited in the Lower Cambrian Sinyaya Formation together with smaller amounts of the C 27 -C 32 homologues (Parfenova et al, 2010).…”