Oil-source rock correlation in the North Viking Graben

Deciphering biodegradation effects on light hydrocarbons in crude oils using their stable carbon isotopic composition: A case study from the Gullfaks oil field, offshore Norway

“…3). A comparison of our d 13 C data of pristane and phytane with those for the whole oils (Gormly et al, 1994) reveals depletion in 13 C of $3& for these isoprenoids.…”

“…Crude oils in the North Viking Graben are either sourced from the Draupne or the Heather Formation, or represent mixed oils originating in variable proportions from both of these two source rocks (Gormly et al, 1994;Horstad et al, 1995). Gormly et al (1994) demonstrated that pristane/phytane (Pr/Ph) ratios and whole oil carbon isotopic signatures are diagnostic for oil-oil and oil-source correlations in the North Viking Graben.…”

“…Gormly et al (1994) demonstrated that pristane/phytane (Pr/Ph) ratios and whole oil carbon isotopic signatures are diagnostic for oil-oil and oil-source correlations in the North Viking Graben. Draupne-sourced oils were shown to have lower Pr/Ph ratios (1.0-1.5) and lower d 13 C values (À31 to À28&) in comparison to Heather-sourced oils (Pr/Ph ratios 2.15 to 4.0; whole oil d 13 C À28 to À25&).…”

“…The main source rock in the Tampen Spur area is the Upper Jurassic Draupne Formation (Gormly et al, 1994). Also the underlying Heather Formation locally represents a source rock with high oil potential (Gormly et al, 1994;Horstad et al, 1995; see Section 4.1 for details). The organic rich shales (5-10% total organic carbon) of the Draupne Formation are the regional Kimmeridge Clay equivalents.…”

Petroleum geology features and research developments of hydrocarbon accumulation in deep petroliferous basins

“…When a deep fluid dynamic field is uplifted to middleshallow formation due to the denudation of overlying strata, the oil and gas exploration potential is weakened below a depth of 4,500 m. For example, the limited fluid dynamic field is currently above a depth of 4,500 m in the Chu-Saleisu Basin, Kazakhstan, resulting from the overall uplifting caused by the denudation of overlying strata. So the bound fluid dynamic field, which is unfavorable for oil and gas exploration, is currently developed below a depth of 4,500 m. P c is capillary pressure in a tight reservoir P w is water column pressure above oil-gas reservoir P e is inner pressure of oil-gas reservoir fingerprints, n-and iso-alkane hydrocarbon ratios, steroids/ terpenoids, aromatics, non-aromatics, as well as family composition and carbon isotope studies (Gormly et al 1994;Telnaes and Cooper 1991;Stahl 1978;Seifert 1978;Hirner et al 1981); index comparison using aromatics and thiophene compounds (Michael et al 1989;Mukhopadhyay et al 1995;Jing 2005) and comprehensive crude oil light hydrocarbon analysis for multi-period and multisource reservoirs Philippi 1981;Odden et al 1998;Chen et al 2003).…”