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Hydrocarbon source rock potential of the Devonian rocks of the Orcadian Basin

J. E. A. Marshall, J. F. Brown and S. Hindmarsh
Scottish Journal of Geology, 21, 301-320, 1 February 1985, https://doi.org/10.1144/sjg21030301
J. E. A. Marshall
1Department of Geology, University of Southampton, Highfield, Southampton, SO9 5NH
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J. F. Brown
2Mobil Oil Libya Ltd., P.O. Box 690, Tripoli, Libya
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S. Hindmarsh
3Gearhart Geo Consultants Ltd., Howe Moss Drive, Kirkhill Industrial Estate, Dyce, Aberdeen, AB2 0GL
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Synopsis

Potential hydrocarbon source rocks are evaluated from the Devonian Orcadian Basin (plus a small suite from the Hornelen Basin, Norway) for organic matter richness, type and maturation level. Techniques used include total organic carbon determination, pyrolysis, visual kerogen typing, spore colour and vitrinite reflectance. The sequences of SE Shetland, the Walls Sandstone, Fair Isle and the Hornelen Basin only contain small amounts of organic matter and were probably thermally mature before any significant cover was established and any minor hydrocarbons generated were soon lost. The main development of the Orcadian Basin does contain significant Middle Devonian and minor Lower Devonian hydrocarbon source rocks with oil and gas prone materials which are still in the oil window for the majority of the succession. Speculations are made concerning the possibility of hydrocarbons accumulating from this part of the sequence and prospects include reservoirs in the Upper Old Red Sandstone, Eday Beds, John O'Groats Sandstone, and the Lower Old Red Sandstone although deep ‘weathering’ effects are probably detrimental to preservation. Aeolian beds associated with extensive organic rich units may also be significant. Possible sites for hydrocarbon accumulation are the offshore half graben structures beneath the Moray Firth and in the onshore Devonian sequence. The timing of hydrocarbon generation is thought to be early.

  • © 1985 Scottish Journal of Geology

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Scottish Journal of Geology: 21 (3)
Scottish Journal of Geology
Volume 21, Issue 3
February 1985
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Hydrocarbon source rock potential of the Devonian rocks of the Orcadian Basin

J. E. A. Marshall, J. F. Brown and S. Hindmarsh
Scottish Journal of Geology, 21, 301-320, 1 February 1985, https://doi.org/10.1144/sjg21030301
J. E. A. Marshall
1Department of Geology, University of Southampton, Highfield, Southampton, SO9 5NH
  • Find this author on Google Scholar
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J. F. Brown
2Mobil Oil Libya Ltd., P.O. Box 690, Tripoli, Libya
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S. Hindmarsh
3Gearhart Geo Consultants Ltd., Howe Moss Drive, Kirkhill Industrial Estate, Dyce, Aberdeen, AB2 0GL
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  • Search for this author on this site

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Hydrocarbon source rock potential of the Devonian rocks of the Orcadian Basin

J. E. A. Marshall, J. F. Brown and S. Hindmarsh
Scottish Journal of Geology, 21, 301-320, 1 February 1985, https://doi.org/10.1144/sjg21030301
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