Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure

Master's thesis in Petroleum Geosciences Engineering Prominent high-value gamma-ray spikes in the maximum flooding surfaces of the Alge Member of the Hekkingen Formation display an uncommon stratigraphic and regional variation in the southwestern Barents Sea. The variation in the gamma-ray spik...

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Main Author: Helleren, Solveig
Other Authors: Marín Restrepo, Dora Luz, Augustsson, Carita, Ohm, Sverre Ekrene
Format: Master Thesis
Language:English
Published: University of Stavanger, Norway 2019
Subjects:
Online Access:http://hdl.handle.net/11250/2619398
id ftunivstavanger:oai:uis.brage.unit.no:11250/2619398
record_format openpolar
spelling ftunivstavanger:oai:uis.brage.unit.no:11250/2619398 2023-06-11T04:10:33+02:00 Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure Helleren, Solveig Marín Restrepo, Dora Luz Augustsson, Carita Ohm, Sverre Ekrene 2019-06 application/pdf http://hdl.handle.net/11250/2619398 eng eng University of Stavanger, Norway Masteroppgave/UIS-TN-IER/2019; http://hdl.handle.net/11250/2619398 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no petroleumsgeologi Hekkingen Formation Alge Member source rock composition high-value gamma-ray spikes uranium southwestern Barents Sea petroleum geology VDP::Technology: 500::Rock and petroleum disciplines: 510::Geological engineering: 513 VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 Master thesis 2019 ftunivstavanger 2023-05-29T16:01:57Z Master's thesis in Petroleum Geosciences Engineering Prominent high-value gamma-ray spikes in the maximum flooding surfaces of the Alge Member of the Hekkingen Formation display an uncommon stratigraphic and regional variation in the southwestern Barents Sea. The variation in the gamma-ray spikes indicates compositional variation in the Alge Member, thus, challenging the common perception that the Upper Jurassic source rock is a homogenous succession of black shale. The purpose of this study is to identify the compositional variation in the source rock that causes the high-value gamma-ray spikes in the Alge Member, and by comparing the lateral compositional changes in the Alge Member – be able to develop an improved understanding of the depositional environment and the paleogeography in the area during deposition. This study integrates data from X-ray diffraction of clay minerals, geochemical analysis, maceral analysis, seismic reflection data, well logs and sedimentary core logs. The studied compositional elements of the Alge Member show no correaltion to the high-value gamma-ray spike. However, their geographical distribution correlates with the depositional environments interpreted from the sedimentary core logs and the seismic facies observed in the Alge Member. West and northwest of the Loppa High, the composition of the Alge Member reveal that the deposition of the member was influenced by the ongoing rifting and uplift of the Loppa High. Whereas, in the Hammerfest Basin and in the area eastward toward and surrounding the Nordkapp Basin, the Alge Member experienced a low energy deposition in hypoxic to anoxic bottom conditions. The high-value gamma-ray spikes are present when the Alge Member has been deposited in a hypoxic to anoxic environment. Moreover, the high-value gamma-ray spikes correlate to the uranium content in the member. The conditions that are required for uranium precipitation in the sediments could be used to reconstruct the development of the anoxic zone in the southwestern Barents Sea ... Master Thesis Barents Sea Hammerfest Hammerfest Basin Loppa Nordkapp Nordkapp Basin University of Stavanger: UiS Brage Barents Sea Hekkingen ENVELOPE(17.832,17.832,69.597,69.597) Loppa ENVELOPE(22.351,22.351,70.240,70.240)
institution Open Polar
collection University of Stavanger: UiS Brage
op_collection_id ftunivstavanger
language English
topic petroleumsgeologi
Hekkingen Formation
Alge Member
source rock composition
high-value gamma-ray spikes
uranium
southwestern Barents Sea
petroleum geology
VDP::Technology: 500::Rock and petroleum disciplines: 510::Geological engineering: 513
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464
spellingShingle petroleumsgeologi
Hekkingen Formation
Alge Member
source rock composition
high-value gamma-ray spikes
uranium
southwestern Barents Sea
petroleum geology
VDP::Technology: 500::Rock and petroleum disciplines: 510::Geological engineering: 513
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464
Helleren, Solveig
Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
topic_facet petroleumsgeologi
Hekkingen Formation
Alge Member
source rock composition
high-value gamma-ray spikes
uranium
southwestern Barents Sea
petroleum geology
VDP::Technology: 500::Rock and petroleum disciplines: 510::Geological engineering: 513
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464
description Master's thesis in Petroleum Geosciences Engineering Prominent high-value gamma-ray spikes in the maximum flooding surfaces of the Alge Member of the Hekkingen Formation display an uncommon stratigraphic and regional variation in the southwestern Barents Sea. The variation in the gamma-ray spikes indicates compositional variation in the Alge Member, thus, challenging the common perception that the Upper Jurassic source rock is a homogenous succession of black shale. The purpose of this study is to identify the compositional variation in the source rock that causes the high-value gamma-ray spikes in the Alge Member, and by comparing the lateral compositional changes in the Alge Member – be able to develop an improved understanding of the depositional environment and the paleogeography in the area during deposition. This study integrates data from X-ray diffraction of clay minerals, geochemical analysis, maceral analysis, seismic reflection data, well logs and sedimentary core logs. The studied compositional elements of the Alge Member show no correaltion to the high-value gamma-ray spike. However, their geographical distribution correlates with the depositional environments interpreted from the sedimentary core logs and the seismic facies observed in the Alge Member. West and northwest of the Loppa High, the composition of the Alge Member reveal that the deposition of the member was influenced by the ongoing rifting and uplift of the Loppa High. Whereas, in the Hammerfest Basin and in the area eastward toward and surrounding the Nordkapp Basin, the Alge Member experienced a low energy deposition in hypoxic to anoxic bottom conditions. The high-value gamma-ray spikes are present when the Alge Member has been deposited in a hypoxic to anoxic environment. Moreover, the high-value gamma-ray spikes correlate to the uranium content in the member. The conditions that are required for uranium precipitation in the sediments could be used to reconstruct the development of the anoxic zone in the southwestern Barents Sea ...
author2 Marín Restrepo, Dora Luz
Augustsson, Carita
Ohm, Sverre Ekrene
format Master Thesis
author Helleren, Solveig
author_facet Helleren, Solveig
author_sort Helleren, Solveig
title Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
title_short Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
title_full Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
title_fullStr Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
title_full_unstemmed Lateral compositional variations in the Upper Jurassic source rock in the southwestern Barents Sea – an organic or inorganic disclosure
title_sort lateral compositional variations in the upper jurassic source rock in the southwestern barents sea – an organic or inorganic disclosure
publisher University of Stavanger, Norway
publishDate 2019
url http://hdl.handle.net/11250/2619398
long_lat ENVELOPE(17.832,17.832,69.597,69.597)
ENVELOPE(22.351,22.351,70.240,70.240)
geographic Barents Sea
Hekkingen
Loppa
geographic_facet Barents Sea
Hekkingen
Loppa
genre Barents Sea
Hammerfest
Hammerfest Basin
Loppa
Nordkapp
Nordkapp Basin
genre_facet Barents Sea
Hammerfest
Hammerfest Basin
Loppa
Nordkapp
Nordkapp Basin
op_relation Masteroppgave/UIS-TN-IER/2019;
http://hdl.handle.net/11250/2619398
op_rights Navngivelse 4.0 Internasjonal
http://creativecommons.org/licenses/by/4.0/deed.no
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