Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps?
This thesis examined gas flares found in the Cruise log 20-2 from CAGE and correlated them to subsurface seismic data in south of Barents Sea. The cruise log passed several hydrocarbon discoveries/fields such as Goliat, Caurus/Langlitinden, Norvarg and Wisting/Hanssen. The aim of the thesis is to in...
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UiT Norges arktiske universitet
2021
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ftunivtroemsoe:oai:munin.uit.no:10037/22393 2023-05-15T15:38:50+02:00 Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? Nguyen, Hieu Khanh 2021-07-15 https://hdl.handle.net/10037/22393 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/22393 openAccess Copyright 2021 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 GEO-3900 Master thesis Mastergradsoppgave 2021 ftunivtroemsoe 2021-09-08T22:53:43Z This thesis examined gas flares found in the Cruise log 20-2 from CAGE and correlated them to subsurface seismic data in south of Barents Sea. The cruise log passed several hydrocarbon discoveries/fields such as Goliat, Caurus/Langlitinden, Norvarg and Wisting/Hanssen. The aim of the thesis is to investigate the relationship between shallow geology and the observed gas flares and seabed leakages. Multibeam echosounder data and Water Column Imaging (WCI) is used to hunt the flares along the cruise, 12 flare locations are detected mostly over the hydrocarbon discoveries/fields. Well data is also used to investigate if or how some of the flares might be connected to the drilling activities. However, not all amplitude anomalies in the WCI are gas flares, thus a protocol to define gas flares in WCI is applied. Tectonic movements and uplift in the study area cause faulting and fault reactivation, which open migration pathways from reservoir levels and fluids escape towards the seabed. Additionally, erosion and removal of as much as 2km sediments reduce the overburden pressure, causing the reservoir fluids to expand and escape. Repeated glaciation events during the last ice age formed an unconformity surface (URU) where many potential shallow gas accumulations locate. Shallow accumulation/seismic anomaly along the URU is the main target of this thesis. Some of the observed gas flares are closely related to hydrocarbon wells in the study area, gas might migrate through well-induced fractures along the wellpath. The relationship between deeper gas accumulations, hydrocarbon wells, shallow gas accumulation and potential leakage of gas into the water column is not straight forward. More empirical data and investigations needs to be applied to increase the knowledge of these interrelated and complicated processes Master Thesis Barents Sea Langlitinden Norvarg University of Tromsø: Munin Open Research Archive Barents Sea Hanssen ENVELOPE(-164.467,-164.467,-85.983,-85.983) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 GEO-3900 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 GEO-3900 Nguyen, Hieu Khanh Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 GEO-3900 |
description |
This thesis examined gas flares found in the Cruise log 20-2 from CAGE and correlated them to subsurface seismic data in south of Barents Sea. The cruise log passed several hydrocarbon discoveries/fields such as Goliat, Caurus/Langlitinden, Norvarg and Wisting/Hanssen. The aim of the thesis is to investigate the relationship between shallow geology and the observed gas flares and seabed leakages. Multibeam echosounder data and Water Column Imaging (WCI) is used to hunt the flares along the cruise, 12 flare locations are detected mostly over the hydrocarbon discoveries/fields. Well data is also used to investigate if or how some of the flares might be connected to the drilling activities. However, not all amplitude anomalies in the WCI are gas flares, thus a protocol to define gas flares in WCI is applied. Tectonic movements and uplift in the study area cause faulting and fault reactivation, which open migration pathways from reservoir levels and fluids escape towards the seabed. Additionally, erosion and removal of as much as 2km sediments reduce the overburden pressure, causing the reservoir fluids to expand and escape. Repeated glaciation events during the last ice age formed an unconformity surface (URU) where many potential shallow gas accumulations locate. Shallow accumulation/seismic anomaly along the URU is the main target of this thesis. Some of the observed gas flares are closely related to hydrocarbon wells in the study area, gas might migrate through well-induced fractures along the wellpath. The relationship between deeper gas accumulations, hydrocarbon wells, shallow gas accumulation and potential leakage of gas into the water column is not straight forward. More empirical data and investigations needs to be applied to increase the knowledge of these interrelated and complicated processes |
format |
Master Thesis |
author |
Nguyen, Hieu Khanh |
author_facet |
Nguyen, Hieu Khanh |
author_sort |
Nguyen, Hieu Khanh |
title |
Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
title_short |
Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
title_full |
Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
title_fullStr |
Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
title_full_unstemmed |
Gas seeps in the Barents Sea – how does the geology influence the natural and well related seeps? |
title_sort |
gas seeps in the barents sea – how does the geology influence the natural and well related seeps? |
publisher |
UiT Norges arktiske universitet |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/22393 |
long_lat |
ENVELOPE(-164.467,-164.467,-85.983,-85.983) |
geographic |
Barents Sea Hanssen |
geographic_facet |
Barents Sea Hanssen |
genre |
Barents Sea Langlitinden Norvarg |
genre_facet |
Barents Sea Langlitinden Norvarg |
op_relation |
https://hdl.handle.net/10037/22393 |
op_rights |
openAccess Copyright 2021 The Author(s) |
_version_ |
1766370198969909248 |