{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T18:52:40Z","timestamp":1767034360005,"version":"3.28.0"},"reference-count":49,"publisher":"Geological Society of London","issue":"3","license":[{"start":{"date-parts":[[1985,2,1]],"date-time":"1985-02-01T00:00:00Z","timestamp":476064000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["SJG"],"published-print":{"date-parts":[[1985,2]]},"abstract":"<jats:title>Synopsis<\/jats:title>\n          <jats:p>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 \u2018weathering\u2019 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.<\/jats:p>","DOI":"10.1144\/sjg21030301","type":"journal-article","created":{"date-parts":[[2010,1,15]],"date-time":"2010-01-15T00:30:59Z","timestamp":1263515459000},"page":"301-320","update-policy":"http:\/\/dx.doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":31,"title":["Hydrocarbon source rock potential of the Devonian rocks of the Orcadian Basin"],"prefix":"10.1144","volume":"21","author":[{"given":"J. E. A.","family":"Marshall","sequence":"first","affiliation":[{"name":"Department of Geology, University of Southampton, Highfield, Southampton, SO9 5NH"}]},{"given":"J. F.","family":"Brown","sequence":"additional","affiliation":[{"name":"Mobil Oil Libya Ltd., P.O. Box 690, Tripoli, Libya"}]},{"given":"S.","family":"Hindmarsh","sequence":"additional","affiliation":[{"name":"Gearhart Geo Consultants Ltd., Howe Moss Drive, Kirkhill Industrial Estate, Dyce, Aberdeen, AB2 0GL"}]}],"member":"1881","published-online":{"date-parts":[[2022,6,7]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1144\/sjg17040257"},{"key":"e_1_2_1_3_1","first-page":"271","volume-title":"Organic Maturation Studies and Fossil Fuel Exploration","author":"BARNARD P. C.","year":"1981","unstructured":"BARNARD P. C., COLLINS A. G., COOPER B. S. 1981. Identification and distribution of kerogen facies in a source rock horizon\u2014examples from the North Sea Basin. In , Brooks J. (ed), Organic Maturation Studies and Fossil Fuel Exploration, 271\u201382, Academic Press."},{"key":"e_1_2_1_4_1","first-page":"169","volume-title":"Petroleum Geology of the Continental Shelf of North West Europe","author":"BARNARD P. C.","year":"1981","unstructured":"BARNARD P. 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Experimental diagenesis of spores, pollen and phytoplasts\u2014the role of metal ions in the diagenesis and analysis of polynomorphs. IV Int. Palynol. Conf. Lucknow (1976\u201377), 2, 545\u201350.","journal-title":"IV Int. Palynol. Conf. Lucknow (1976\u201377)"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1144\/sjg11030259"},{"key":"e_1_2_1_9_1","first-page":"295","volume-title":"Petroleum Geochemistry and Exploration of Europe, Spec. Pub. Geol. Soc. Lond","author":"BUISKOOL TOXOPEUS J. M. A.","year":"1983","unstructured":"BUISKOOL TOXOPEUS J. M. A. 1983. Selection criteria for the use of vitrinite reflectance as a maturity tool. In , Brooks J. (ed), Petroleum Geochemistry and Exploration of Europe, Spec. Pub. Geol. Soc. Lond. 12, 295\u2013307. Blackwell."},{"key":"e_1_2_1_10_1","first-page":"171","volume-title":"Introduction to the Petroleum Geology of the North Sea","author":"CORNFORD C.","year":"1984","unstructured":"CORNFORD C. 1984. 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