Organic geochemical study of the Upper Kimmeridge Clay of the Dorset type area

Farrimond, Paul; Comet, Paul A.; Eglinton, G.; Evershed, Richard P.; Hall, Michael A; Park, David W.; Wardroper, A.M.K.

doi:10.1016/0264-8172(84)90135-1

Cited by 35 publications

(8 citation statements)

References 19 publications

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“…Gallois (1979b) gives a range of 0.3 to 0.4% Ro for the oil shale bands with similar values of 0.31 to 0.36% Ro being reported for Kimmeridge Bay Section (Farrimond et al, 1984). Gallois (1979b) and Williams and Douglas (1979) report a trend of increasing organic maturity northwards from Dorset through Lincolnshire which is not supported by this study, the organic matter being immature over this section of the outcrop.…”

Section: Kerogen Compositionmentioning

confidence: 58%

“…Localized facies variations in the mudstones resulted from: (i) variations in detrital clay and carbonate inputs relative to organic input giving changes in overall lithology from organic-rich 1 Present address: Amoco (UK) Exploration Co, Amoco House, 1 Stephen Street, London W1P 2AU to carbonate-rich mudstones; (ii) sedimentation rate variations reflecting the overall Jurassic basin and swell subsidence pattern (Hallam, 1958;Hallam and Sellwood, 1976), resulting in variable dilution and preservation of the organic matter flux; and (iii) maximum burial depth variations affecting the level of both clay diagenesis and organic maturation. The organic matter content of the mudstones appears to be independent of the lithology, being determined by detrital dilution by clay and carbonate minerals and by subsequent diagenesis (Williams and Douglas, 1983;Farrimond et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Clay diagenesis in the Kimmeridge Clay Formation, onshore UK, and its relation to organic maturation

Scotchman

1987

Mineral. mag.

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Conversion of randomly ordered illite-smectite to ordered illite-smectite in the Upper Jurassic Kimmeridge Clay Formation from the North Sea has been recorded in the literature as occurring within the 'oil window' and has been suggested as an indicator of oil source rock maturity. Studies of authigenic clay minerals in the fine fraction (>0.5/xm) of the Kimmeridge Clay Formation mudstones from fourteen locations along the UK onshore outcrop between Dorset and North Yorkshire show that they comprise mainly ordered illite-smectites. The onshore Kimmeridge Clay section is organically immature, suggesting that the illite-smectite ordering reaction cannot be extrapolated between basins as an inorganic indicator of 'oil window' levels of maturity. These results also have important implications in source rock hydrocarbon expulsion and migration models which involve shale dewatering as a flushing agent. However, dewatering of shales may aid migration as it could cause fracturing of the shale bands separating the organic-rich layers within the source rock, prior to hydrocarbon generation.K E Y w 0 R D S" clay diagenesis, Kimmeridge Clay Formation, illite, smectite, organic maturation.

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Section: Kerogen Compositionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Clay diagenesis in the Kimmeridge Clay Formation, onshore UK, and its relation to organic maturation

Scotchman

1987

Mineral. mag.

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“…The Kimmeridge Clay has long been recognized as the major source rock for North Sea oil, although at its type locality in Dorset the succession is immature, having suffered only modest burial (e.g. Farrimond et al 1984;Scotchman, 1987;Ebukanson & Kinghorn, 1986;Saelen et al 2000.). The boreholes are situated on the flat-lying limb of the Purbeck monocline, close to coastal exposures, at Swanworth Quarry [SY 9675 7823] and at Metherhills [SY 9112 7911], these sites chosen to make best use of the comprehensive palaeontological, sedimentological and geochemical work already carried out on the type section (e.g.…”

Section: Introductionmentioning

confidence: 99%

Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, UK

et al. 2001

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For the purposes of a high-resolution multi-disciplinary study of the Upper Jurassic Kimmeridge Clay Formation, two boreholes were drilled at Swanworth Quarry and one at Metherhills, south Dorset, UK. Together, the cores represent the first complete section through the entire formation close to the type section. We present graphic logs that record the stratigraphy of the cores, and outline the complementary geophysical and analytical data sets (gamma ray, magnetic susceptibility, total organic carbon, carbonate, δ13Corg). Of particular note are the new borehole data from the lowermost part of the formation which does not crop out in the type area. Detailed logs are available for download from the Kimmeridge Drilling Project web-site at http://kimmeridge.earth.ox.ac.uk/. Of further interest is a mid-eudoxus Zone positive shift in the δ13Corg record, a feature that is also registered in Tethyan carbonate successions, suggesting that it is a regional event and may therefore be useful for correlation. The lithostratigraphy of the cores has been precisely correlated with the nearby cliff section, which has also been examined and re-described. Magnetic-susceptibility and spectral gamma-ray measurements were made at a regular spacing through the succession, and facilitate core-to-exposure correlation. The strata of the exposure and core have been subdivided into four main mudrock lithological types: (a) medium-dark–dark-grey marl; (b) medium-dark–dark grey–greenish black shale; (c) dark-grey–olive-black laminated shale; (d) greyish-black–brownish-black mudstone. The sections also contain subordinate amounts of siltstone, limestone and dolostone. Comparison of the type section with the cores reveals slight lithological variation and notable thickness differences between the coeval strata. The proximity of the boreholes and different parts of the type section to the Purbeck–Isle of Wight Disturbance is proposed as a likely control on the thickness changes.

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“…If the rock has a significant organic carbon content, it readily absorbs moisture and hence the risk/rate of oxidation is increased (Farrimond et al 1984). Many of the test results reported on dark grey/black rocks which contain pyrite have organic contents in the range of 2-5 %.…”

Section: Organic Contentmentioning

confidence: 99%

Implications of Pyrite Oxidation for Engineering Works

Hawkins¹,

John²

2014

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Organic geochemical study of the Upper Kimmeridge Clay of the Dorset type area

Cited by 35 publications

References 19 publications

Clay diagenesis in the Kimmeridge Clay Formation, onshore UK, and its relation to organic maturation

Clay diagenesis in the Kimmeridge Clay Formation, onshore UK, and its relation to organic maturation

Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, UK

Implications of Pyrite Oxidation for Engineering Works

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