OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM
In this study, we assess the oil generation potential of Lower Carboniferous, liptinite‐rich coals in the Tettegras Formation on the Finnmark Platform, southern Norwegian Barents Sea. Oil from these coals has been expelled into intercalated sandstones. The coals may have contributed to petroleum rec...
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crwiley:10.1111/j.1747-5457.2010.00471.x 2024-09-15T17:57:47+00:00 OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM Van Koeverden, J.H. Karlsen, D.A. Schwark, L. Chpitsglouz, A. Backer‐Owe, K. 2010 http://dx.doi.org/10.1111/j.1747-5457.2010.00471.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1747-5457.2010.00471.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1747-5457.2010.00471.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Petroleum Geology volume 33, issue 2, page 155-181 ISSN 0141-6421 1747-5457 journal-article 2010 crwiley https://doi.org/10.1111/j.1747-5457.2010.00471.x 2024-08-01T04:23:46Z In this study, we assess the oil generation potential of Lower Carboniferous, liptinite‐rich coals in the Tettegras Formation on the Finnmark Platform, southern Norwegian Barents Sea. Oil from these coals has been expelled into intercalated sandstones. The coals may have contributed to petroleum recorded in well 7128/4–1 on the Finnmark Platform and may constitute a new Palaeozoic source rock in the Barents Sea. The Tettegras Formation coals contain up to 80 vol.% liptinite (mineral matter free base) and have low oxygen indices. Hydrogen indices up to 367 mg HC/g TOC indicate liquid hydrocarbon potential. In wells 7128/4–1 and 7128/6–1, the coals have vitrinite reflectance R o = 0.75–0.85 %. Compared to shale and carbonate source rocks, expulsion from coal in general begins at higher maturities (R o = 0.8–0.9% and T max = 444–453°C). Thus, the coals in the wells are mostly immature with regard to oil expulsion. The oil in well 7128/4–1 most likely originates from a more mature part of the Tettegras Formation in the deeper northern part of the Finnmark Platform. Wide variations in biomarker facies parameters and δ 13 C isotope values indicate a heterogeneous paralic depositional setting. The preferential retention by coal strata of naphthenes (e.g. terpanes and steranes) and aromatic compounds, compared to n‐alkanes and acyclic isoprenoids, results in a terrigenous and waxy oil. This oil however contains marine biomarkers derived from the intercalated shales and siltstones. It is therefore important to consider the entire coal‐bearing sequence, including the intercalated shales, in terms of source rock potential. Coals of similar age occur on Svalbard and Bjørnøya. The results of this study therefore suggest that a Lower Carboniferous coaly source rock may extend over large areas of the Norwegian Barents Sea. This source rock is mature in areas where the otherwise prolific Upper Jurassic marine shales are either immature or missing and may constitute a new Palaeozoic coal‐sourced petroleum system in the Barents ... Article in Journal/Newspaper Barents Sea Bjørnøya Finnmark Svalbard Finnmark Wiley Online Library Journal of Petroleum Geology 33 2 155 181 |
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Wiley Online Library |
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English |
description |
In this study, we assess the oil generation potential of Lower Carboniferous, liptinite‐rich coals in the Tettegras Formation on the Finnmark Platform, southern Norwegian Barents Sea. Oil from these coals has been expelled into intercalated sandstones. The coals may have contributed to petroleum recorded in well 7128/4–1 on the Finnmark Platform and may constitute a new Palaeozoic source rock in the Barents Sea. The Tettegras Formation coals contain up to 80 vol.% liptinite (mineral matter free base) and have low oxygen indices. Hydrogen indices up to 367 mg HC/g TOC indicate liquid hydrocarbon potential. In wells 7128/4–1 and 7128/6–1, the coals have vitrinite reflectance R o = 0.75–0.85 %. Compared to shale and carbonate source rocks, expulsion from coal in general begins at higher maturities (R o = 0.8–0.9% and T max = 444–453°C). Thus, the coals in the wells are mostly immature with regard to oil expulsion. The oil in well 7128/4–1 most likely originates from a more mature part of the Tettegras Formation in the deeper northern part of the Finnmark Platform. Wide variations in biomarker facies parameters and δ 13 C isotope values indicate a heterogeneous paralic depositional setting. The preferential retention by coal strata of naphthenes (e.g. terpanes and steranes) and aromatic compounds, compared to n‐alkanes and acyclic isoprenoids, results in a terrigenous and waxy oil. This oil however contains marine biomarkers derived from the intercalated shales and siltstones. It is therefore important to consider the entire coal‐bearing sequence, including the intercalated shales, in terms of source rock potential. Coals of similar age occur on Svalbard and Bjørnøya. The results of this study therefore suggest that a Lower Carboniferous coaly source rock may extend over large areas of the Norwegian Barents Sea. This source rock is mature in areas where the otherwise prolific Upper Jurassic marine shales are either immature or missing and may constitute a new Palaeozoic coal‐sourced petroleum system in the Barents ... |
format |
Article in Journal/Newspaper |
author |
Van Koeverden, J.H. Karlsen, D.A. Schwark, L. Chpitsglouz, A. Backer‐Owe, K. |
spellingShingle |
Van Koeverden, J.H. Karlsen, D.A. Schwark, L. Chpitsglouz, A. Backer‐Owe, K. OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
author_facet |
Van Koeverden, J.H. Karlsen, D.A. Schwark, L. Chpitsglouz, A. Backer‐Owe, K. |
author_sort |
Van Koeverden, J.H. |
title |
OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
title_short |
OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
title_full |
OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
title_fullStr |
OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
title_full_unstemmed |
OIL‐PRONE LOWER CARBONIFEROUS COALS IN THE NORWEGIAN BARENTS SEA: IMPLICATIONS FOR A PALAEOZOIC PETROLEUM SYSTEM |
title_sort |
oil‐prone lower carboniferous coals in the norwegian barents sea: implications for a palaeozoic petroleum system |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1747-5457.2010.00471.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1747-5457.2010.00471.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1747-5457.2010.00471.x |
genre |
Barents Sea Bjørnøya Finnmark Svalbard Finnmark |
genre_facet |
Barents Sea Bjørnøya Finnmark Svalbard Finnmark |
op_source |
Journal of Petroleum Geology volume 33, issue 2, page 155-181 ISSN 0141-6421 1747-5457 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1747-5457.2010.00471.x |
container_title |
Journal of Petroleum Geology |
container_volume |
33 |
container_issue |
2 |
container_start_page |
155 |
op_container_end_page |
181 |
_version_ |
1810433970521767936 |