Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin
ABSTRACT Stacked basalt flows cover much of the NW European continental margin, including potentially prospective sediments of the Faroes shelf. Such flows attenuate seismic energy, hindering sub-basalt structural imaging which is critical for both exploration and tectonic studies. Low-frequency, lo...
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Geological Society of London
2016
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ftdatacite:10.6084/m9.figshare.3454907.v1 2023-05-15T16:11:16+02:00 Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin K. W. Helen Lau R. S. White P. A. F. Christie 2016 https://dx.doi.org/10.6084/m9.figshare.3454907.v1 https://geolsoc.figshare.com/articles/dataset/Integrating_streamer_and_ocean-bottom_seismic_data_for_sub-basalt_imaging_on_the_Atlantic_Margin/3454907/1 unknown Geological Society of London https://dx.doi.org/10.1144/1354-0793/10-023 https://dx.doi.org/10.6084/m9.figshare.3454907 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences dataset Dataset 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3454907.v1 https://doi.org/10.1144/1354-0793/10-023 https://doi.org/10.6084/m9.figshare.3454907 2021-11-05T12:55:41Z ABSTRACT Stacked basalt flows cover much of the NW European continental margin, including potentially prospective sediments of the Faroes shelf. Such flows attenuate seismic energy, hindering sub-basalt structural imaging which is critical for both exploration and tectonic studies. Low-frequency, long-offset reflection surveys have yielded improved images below top basalt, while coincident ocean-bottom seismometer (OBS) data have mapped low velocity zones (LVZ) from tomographic inversion. Image correlation in a common depth domain is challenged by low spatial resolution of the tomographic image, the absence of turning rays in a LVZ and the lack of wide-angle arrivals in the reflection data. We integrate densely sampled reflection data with deep velocities from OBS data to give a common velocity model in a new, iterated, pre-stack depth-migration workflow using complementary constraints from the two datasets. The matched velocity model and depth image enable interpretation of (i) a uniform flood basalt sequence, 2–4 km thick beneath the Fugloy Ridge, with velocities correlating with those in the Lopra 1/1A borehole and (ii) a sub-basalt LVZ with chaotic reflections corresponding to sill-intruded, probably syn-rift sediments. Such a workflow could be extended to targets beneath high velocity salt or basalt and could provide constraints for 3D datasets. Dataset Faroes Fugloy Fugloy* DataCite Metadata Store (German National Library of Science and Technology) Fugloy ENVELOPE(-6.305,-6.305,62.337,62.337) Lopra ENVELOPE(-6.771,-6.771,61.444,61.444) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences K. W. Helen Lau R. S. White P. A. F. Christie Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
ABSTRACT Stacked basalt flows cover much of the NW European continental margin, including potentially prospective sediments of the Faroes shelf. Such flows attenuate seismic energy, hindering sub-basalt structural imaging which is critical for both exploration and tectonic studies. Low-frequency, long-offset reflection surveys have yielded improved images below top basalt, while coincident ocean-bottom seismometer (OBS) data have mapped low velocity zones (LVZ) from tomographic inversion. Image correlation in a common depth domain is challenged by low spatial resolution of the tomographic image, the absence of turning rays in a LVZ and the lack of wide-angle arrivals in the reflection data. We integrate densely sampled reflection data with deep velocities from OBS data to give a common velocity model in a new, iterated, pre-stack depth-migration workflow using complementary constraints from the two datasets. The matched velocity model and depth image enable interpretation of (i) a uniform flood basalt sequence, 2–4 km thick beneath the Fugloy Ridge, with velocities correlating with those in the Lopra 1/1A borehole and (ii) a sub-basalt LVZ with chaotic reflections corresponding to sill-intruded, probably syn-rift sediments. Such a workflow could be extended to targets beneath high velocity salt or basalt and could provide constraints for 3D datasets. |
format |
Dataset |
author |
K. W. Helen Lau R. S. White P. A. F. Christie |
author_facet |
K. W. Helen Lau R. S. White P. A. F. Christie |
author_sort |
K. W. Helen Lau |
title |
Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
title_short |
Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
title_full |
Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
title_fullStr |
Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
title_full_unstemmed |
Integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the Atlantic Margin |
title_sort |
integrating streamer and ocean-bottom seismic data for sub-basalt imaging on the atlantic margin |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3454907.v1 https://geolsoc.figshare.com/articles/dataset/Integrating_streamer_and_ocean-bottom_seismic_data_for_sub-basalt_imaging_on_the_Atlantic_Margin/3454907/1 |
long_lat |
ENVELOPE(-6.305,-6.305,62.337,62.337) ENVELOPE(-6.771,-6.771,61.444,61.444) |
geographic |
Fugloy Lopra |
geographic_facet |
Fugloy Lopra |
genre |
Faroes Fugloy Fugloy* |
genre_facet |
Faroes Fugloy Fugloy* |
op_relation |
https://dx.doi.org/10.1144/1354-0793/10-023 https://dx.doi.org/10.6084/m9.figshare.3454907 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454907.v1 https://doi.org/10.1144/1354-0793/10-023 https://doi.org/10.6084/m9.figshare.3454907 |
_version_ |
1765996411205189632 |