Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf
Upper Palaeozoic strata are potential sources for hydrocarbon plays on the Norwegian Barents Shelf. The island of Bjørnøya (Bear Island) is located on the western margin of the Barents Shelf and represents an exposed part of the Stappen High, which makes it an excellent location to investigate the s...
Published in: | Marine and Petroleum Geology |
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2024
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Online Access: | http://hdl.handle.net/10852/110167 https://doi.org/10.1016/j.marpetgeo.2024.106768 |
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ftoslouniv:oai:www.duo.uio.no:10852/110167 2024-09-15T17:58:19+00:00 Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf ENEngelskEnglishDepositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. 2024-02-27T12:50:27Z http://hdl.handle.net/10852/110167 https://doi.org/10.1016/j.marpetgeo.2024.106768 EN eng NFR/295208 NFR/228107 Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. . Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf. Marine and Petroleum Geology. 2024, 163 http://hdl.handle.net/10852/110167 2250216 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Marine and Petroleum Geology&rft.volume=163&rft.spage=&rft.date=2024 Marine and Petroleum Geology 163 20 https://doi.org/10.1016/j.marpetgeo.2024.106768 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 0264-8172 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2024 ftoslouniv https://doi.org/10.1016/j.marpetgeo.2024.106768 2024-08-05T14:09:29Z Upper Palaeozoic strata are potential sources for hydrocarbon plays on the Norwegian Barents Shelf. The island of Bjørnøya (Bear Island) is located on the western margin of the Barents Shelf and represents an exposed part of the Stappen High, which makes it an excellent location to investigate the source rock potential of this succession. Here, we investigate the organic geochemical composition and source rock potential of coals and organic-rich mudstones of Late Devonian to middle Permian ages. The thermal maturity of the analysed samples ranges from mature to overmature with some samples being in the late oil generation window, and thus exhibiting higher maturities than age and facies equivalent strata in central Spitsbergen in the NW corner of the Barents Shelf and on the Finnmark Platform to the south. The high maturities and thermal cracking may thus have negatively affected the applied isoprenoid and biomarker-based source facies parameters, which potentially inhibit correct source facies interpretation. However, our results and comparisons with previous studies indicate that the vitrinite- and inertinite-dominated humic coals occurring in the lower part of the succession formed by the accumulation of peat in fluvially-influenced, humid wetlands at paleo-equatorial latitudes during a pronounced episode of rifting in the Late Devonian (Famennian) to earliest Carboniferous (Mississippian). Our source rock evaluation indicates a good potential for liquid hydrocarbon generation for the coals of the Upper Devonian Røedvika Formation prior to maturation. The oil-prone organic matter of these coals is primarily considered as terrestrial and non-aqueous. Because of renewed rifting in the middle Carboniferous combined with a shift to arid climatic conditions, as well as an environmental change from dominantly terrestrial and marginal marine clastic to marine carbonate platform environments, the accumulation of wetland peats effectively came to an end. Thus, the overlying Carboniferous and Permian strata generally ... Article in Journal/Newspaper Bear Island Bjørnøya Finnmark Finnmark Spitsbergen Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Marine and Petroleum Geology 163 106768 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Upper Palaeozoic strata are potential sources for hydrocarbon plays on the Norwegian Barents Shelf. The island of Bjørnøya (Bear Island) is located on the western margin of the Barents Shelf and represents an exposed part of the Stappen High, which makes it an excellent location to investigate the source rock potential of this succession. Here, we investigate the organic geochemical composition and source rock potential of coals and organic-rich mudstones of Late Devonian to middle Permian ages. The thermal maturity of the analysed samples ranges from mature to overmature with some samples being in the late oil generation window, and thus exhibiting higher maturities than age and facies equivalent strata in central Spitsbergen in the NW corner of the Barents Shelf and on the Finnmark Platform to the south. The high maturities and thermal cracking may thus have negatively affected the applied isoprenoid and biomarker-based source facies parameters, which potentially inhibit correct source facies interpretation. However, our results and comparisons with previous studies indicate that the vitrinite- and inertinite-dominated humic coals occurring in the lower part of the succession formed by the accumulation of peat in fluvially-influenced, humid wetlands at paleo-equatorial latitudes during a pronounced episode of rifting in the Late Devonian (Famennian) to earliest Carboniferous (Mississippian). Our source rock evaluation indicates a good potential for liquid hydrocarbon generation for the coals of the Upper Devonian Røedvika Formation prior to maturation. The oil-prone organic matter of these coals is primarily considered as terrestrial and non-aqueous. Because of renewed rifting in the middle Carboniferous combined with a shift to arid climatic conditions, as well as an environmental change from dominantly terrestrial and marginal marine clastic to marine carbonate platform environments, the accumulation of wetland peats effectively came to an end. Thus, the overlying Carboniferous and Permian strata generally ... |
format |
Article in Journal/Newspaper |
author |
Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. |
spellingShingle |
Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
author_facet |
Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. |
author_sort |
Janocha, Julian |
title |
Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
title_short |
Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
title_full |
Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
title_fullStr |
Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
title_full_unstemmed |
Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf |
title_sort |
depositional environments and source rock potential of some upper palaeozoic (devonian) coals on bjørnøya, western barents shelf |
publishDate |
2024 |
url |
http://hdl.handle.net/10852/110167 https://doi.org/10.1016/j.marpetgeo.2024.106768 |
genre |
Bear Island Bjørnøya Finnmark Finnmark Spitsbergen |
genre_facet |
Bear Island Bjørnøya Finnmark Finnmark Spitsbergen |
op_source |
0264-8172 |
op_relation |
NFR/295208 NFR/228107 Janocha, Julian Wesenlund, Fredrik Thießen, Olaf Grundvåg, Sten-Andreas Koehl, Jean-Baptiste Philippe Johannessen, Erik P. . Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf. Marine and Petroleum Geology. 2024, 163 http://hdl.handle.net/10852/110167 2250216 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Marine and Petroleum Geology&rft.volume=163&rft.spage=&rft.date=2024 Marine and Petroleum Geology 163 20 https://doi.org/10.1016/j.marpetgeo.2024.106768 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2024.106768 |
container_title |
Marine and Petroleum Geology |
container_volume |
163 |
container_start_page |
106768 |
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1810434706154455040 |