The Jurassic petroleum system north and west of Britain: a geochemical oil-source correlation study

Scotchman, I. C.; Griffith, Christine; Holmes, Arthur; Jones, Dorian P

doi:10.1016/s0146-6380(98)00183-1

Cited by 72 publications

(69 citation statements)

References 22 publications

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“…The simple pattern of n-alkanes with a maximum at nC 14 is comparable with chromatograms derived from Kimmeridgian shale samples and Kimmeridgian-sourced oils (Scotchman et al 1998). Given that this is the major source in the region, it is inferred that the Cretaceous-hosted inclusion oil was derived from the Kimmeridgian.…”

Section: Timing Of Oil Chargesupporting

confidence: 55%

“…The pore oil from well 204/24-1 shows a longer (heavier) suite of n-alkanes and an additional n-alkane maximum at nC 29 , which is consistent with the addition of a waxy component of oil such as would have been generated from the mid-Jurassic (Scotchman et al 1998). Unfortunately, the Cenozoic-hosted inclusion oil chromatograms are inadequate to assess their character and sources fully.…”

Section: Timing Of Oil Chargementioning

confidence: 73%

“…This appears to be a mixture of a degraded and a fresh oil, respresented by the complex mixture and the well-defined n-alkanes, respectively. Other published organic geochemical data for oils from the West of Shetland region also show evidence for mixture from two sources, believed to be Kimmeridgian (late Jurassic) and mid-Jurassic (Scotchman et al 1998;Goodchild et al 1999).…”

Section: Organic Geochemistrymentioning

confidence: 76%

“…Given that this is the major source in the region, it is inferred that the Cretaceous-hosted inclusion oil was derived from the Kimmeridgian. As present-day oils in the region are a mixture from two sources, identified by Scotchman et al (1998) as Kimmeridgian and mid-Jurassic, the observations indicate that the Kimmeridgian oil was the first of the two to migrate into the Cretaceous sandstones and elsewhere. Although the Kimmeridgian is the stratigraphically shallower of the two sources, it may have generated oil first for kinetic reasons or because the kitchen for the first oil charge is located where the mid-Jurassic source is missing.…”

Section: Timing Of Oil Chargementioning

confidence: 94%

“…Models for oil charge in the West of Shetland region include (1) temporary residence in Mesozoic reservoirs followed by remigration into the Paleocene ('motel' model of Lamers & Carmichael 1999); (2) overpressure build-up in Cretaceous sandbodies followed by hydraulic fracturing and leakage into the Paleocene (Iliffe et al 1999); and (3) direct migration into the Paleocene due to overpressure retardation of hydrocarbon generation (Carr & Scotchman 2003). Evidence from organic geochemistry (Scotchman et al 1998;Holmes et al 1999;Goodchild et al 1999), basin modelling (Jowitt et al 1999) and fluid inclusion petrography (Parnell et al 1998) indicates that more than one oil generation is present.…”

Section: Introductionmentioning

confidence: 99%

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Thermal history and oil charge on the UK Atlantic margin

Parnell

Green²,

Watt

et al. 2005

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Integrated apatite fission track analysis and vitrinite reflectance data show that well 204/19-1 in the West of Shetland region, UK Atlantic margin, has experienced only limited additional burial beyond present-day depths. Uplift and cooling to present-day levels probably occurred during late Cenozoic (Eocene to Miocene) basin inversion. Fluid inclusion data indicate that Paleocene-Eocene sandstones have experienced temperatures much higher than can be explained by burial alone. Temperatures up to 200 C indicate the passage of hot fluid through Cenozoic sandstones, which by-passed the pre-Cenozoic section in this and other wells. The hot fluid event must have been of very brief duration (up to 100 years) to show no record in the fission track and reflectance data, implying that the fluids migrated through fracture systems.Oil inclusions in the Cretaceous of well 204/19-1 have a chemistry that suggests derivation from a Kimmeridgian-aged source rock. They occur in cements that show no evidence for the hot fluid event and it is concluded that the cements pre-date the event. Oil inclusions in Cenozoic sandstones have a heavy, degraded character and were trapped at high temperature, suggesting that degradation was related to the hot fluid event. Present-day oils in the West of Shetland region are mixtures, which could reflect components from the two charges distinguished by the integrated thermal and geochemical histories. The inference of fracture-bound flow is consistent with existing models of overpressure development and hydrofracturing.

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Section: Timing Of Oil Chargesupporting

confidence: 55%

Section: Timing Of Oil Chargementioning

confidence: 73%

Section: Organic Geochemistrymentioning

confidence: 76%

Section: Timing Of Oil Chargementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Thermal history and oil charge on the UK Atlantic margin

Parnell

Green²,

Watt

et al. 2005

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Potential of Palaeofluid Analysis for Understanding Oil Charge History

Parnell

2010

Frontiers in Geofluids

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Comparison of geochemical parameters derived from comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry and conventional gas chromatography-mass spectrometry

Wang

Weng

Zhang

et al. 2011

Sci. China Earth Sci.

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The saturated and aromatic hydrocarbon fractions of crude oil samples have been analyzed by using comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry (GC×GC-TOFMS) and conventional gas chromatography-mass spectrometry (GC-MS). In order to investigate the consistency and discrepancy of the obtained data from the two instruments, some petroleum geochemical parameters have been compared. A comparison of 23 geochemical parameters indicates that 10 parameters are comparable from the two instruments with less than 5% deviations. Therefore, GC×GC-TOFMS is equivalent to conventional GC-MS in some geochemical parameter acquisitions. However, the other 13 parameters are discrepant, including gammacerane / -hopane, Ts/Tm, 2-ethyl-naphthalene / 1-ethyl-naphthalene (ENR), (2, 6-dimethyl-naphthalene +2,7-dimethyl-naphthalene) / 1,5-dimethyl-naphthalene (DNR), etc. Furthermore, compared to GC× GC-TOFMS, some low concentration compounds could not be detected by the conventional GC-MS, which results in the missing of related geochemical data. Normally, this is caused by the limited separation power and peak capacity of the conventional GC column. Besides, the co-eluting peak integrations are also affected significantly due to the incomplete separation of the compounds. Some low concentration compounds might not be detected because of the interference from the baseline noise or from other substances. GC×GC-TOFMS prevails in compound separation against the conventional GC-MS by avoiding co-elution, which achieves more accurate and precise peak area measurement with the presence of a true baseline. So petroleum geochemical parameters obtained from the GC×GC-TOFMS are more reliable than those from the conventional GC-MS. GC×GC-TOFMS may become one of the most effective analytical tools for the oil and gas geochemical study.comprehensive two-dimensional gas chromatography, time-of-flight mass spectrometry, gas chromatography-mass spectrometry, geochemical parameters Citation:Wang H T, Weng N, Zhang S C, et al. Comparison of geochemical parameters derived from comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry and conventional gas chromatography-mass spectrometry.

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The Jurassic petroleum system north and west of Britain: a geochemical oil-source correlation study

Cited by 72 publications

References 22 publications

Thermal history and oil charge on the UK Atlantic margin

Thermal history and oil charge on the UK Atlantic margin

Potential of Palaeofluid Analysis for Understanding Oil Charge History

Comparison of geochemical parameters derived from comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry and conventional gas chromatography-mass spectrometry

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