Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II
Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore e...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | http://www.osti.gov/servlets/purl/1532976 https://www.osti.gov/biblio/1532976 https://doi.org/10.1002/2016gc006582 |
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ftosti:oai:osti.gov:1532976 2023-07-30T04:04:03+02:00 Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II Ruppel, Carolyn D. Herman, Bruce M. Brothers, Laura L. Hart, Patrick E. 2021-08-02 application/pdf http://www.osti.gov/servlets/purl/1532976 https://www.osti.gov/biblio/1532976 https://doi.org/10.1002/2016gc006582 unknown http://www.osti.gov/servlets/purl/1532976 https://www.osti.gov/biblio/1532976 https://doi.org/10.1002/2016gc006582 doi:10.1002/2016gc006582 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1002/2016gc006582 2023-07-11T09:34:46Z Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore extent. Most usable borehole data were acquired on a ~500 km stretch of the margin and within 30 km of the contemporary coastline from north of Lake Teshekpuk to nearly the U.S.-Canada border. Relying primarily on deep resistivity logs that should be largely unaffected by drilling fluids and hole conditions, the analysis reveals the persistence of several hundred vertical meters of ice-bonded permafrost in nearshore wells near Prudhoe Bay and Foggy Island Bay, with less permafrost detected to the east and west. Permafrost is inferred beneath many barrier islands and in some nearshore and lagoonal (back-barrier) wells. The analysis of borehole logs confirms the offshore pattern of ice-bearing subsea permafrost distribution determined based on regional seismic analyses and reveals that ice content generally diminishes with distance from the coastline. Lacking better well distribution, it is not possible to determine the absolute seaward extent of ice-bearing permafrost, nor the distribution of permafrost beneath the present-day continental shelf at the end of the Pleistocene. However, the recovery of gas hydrate from an outer shelf well (Belcher) and previous delineation of a log signature possibly indicating gas hydrate in an inner shelf well (Hammerhead 2) imply that permafrost may once have extended across much of the shelf offshore Camden Bay. Other/Unknown Material Ice permafrost Prudhoe Bay SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Canada Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Belcher ENVELOPE(-94.172,-94.172,57.936,57.936) Barrier Islands ENVELOPE(-92.283,-92.283,62.784,62.784) Geochemistry, Geophysics, Geosystems 17 11 4333 4353 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Ruppel, Carolyn D. Herman, Bruce M. Brothers, Laura L. Hart, Patrick E. Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Borehole logging data from legacy wells directly constrain the contemporary distribution of subsea permafrost in the sedimentary section at discrete locations on the U.S. Beaufort Margin and complement recent regional analyses of exploration seismic data to delineate the permafrost's offshore extent. Most usable borehole data were acquired on a ~500 km stretch of the margin and within 30 km of the contemporary coastline from north of Lake Teshekpuk to nearly the U.S.-Canada border. Relying primarily on deep resistivity logs that should be largely unaffected by drilling fluids and hole conditions, the analysis reveals the persistence of several hundred vertical meters of ice-bonded permafrost in nearshore wells near Prudhoe Bay and Foggy Island Bay, with less permafrost detected to the east and west. Permafrost is inferred beneath many barrier islands and in some nearshore and lagoonal (back-barrier) wells. The analysis of borehole logs confirms the offshore pattern of ice-bearing subsea permafrost distribution determined based on regional seismic analyses and reveals that ice content generally diminishes with distance from the coastline. Lacking better well distribution, it is not possible to determine the absolute seaward extent of ice-bearing permafrost, nor the distribution of permafrost beneath the present-day continental shelf at the end of the Pleistocene. However, the recovery of gas hydrate from an outer shelf well (Belcher) and previous delineation of a log signature possibly indicating gas hydrate in an inner shelf well (Hammerhead 2) imply that permafrost may once have extended across much of the shelf offshore Camden Bay. |
author |
Ruppel, Carolyn D. Herman, Bruce M. Brothers, Laura L. Hart, Patrick E. |
author_facet |
Ruppel, Carolyn D. Herman, Bruce M. Brothers, Laura L. Hart, Patrick E. |
author_sort |
Ruppel, Carolyn D. |
title |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
title_short |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
title_full |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
title_fullStr |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
title_full_unstemmed |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 2. Borehole constraints: SUBSEA PERMAFROST IN U.S. BEAUFORT II |
title_sort |
subsea ice-bearing permafrost on the u.s. beaufort margin: 2. borehole constraints: subsea permafrost in u.s. beaufort ii |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1532976 https://www.osti.gov/biblio/1532976 https://doi.org/10.1002/2016gc006582 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-94.172,-94.172,57.936,57.936) ENVELOPE(-92.283,-92.283,62.784,62.784) |
geographic |
Canada Island Bay Belcher Barrier Islands |
geographic_facet |
Canada Island Bay Belcher Barrier Islands |
genre |
Ice permafrost Prudhoe Bay |
genre_facet |
Ice permafrost Prudhoe Bay |
op_relation |
http://www.osti.gov/servlets/purl/1532976 https://www.osti.gov/biblio/1532976 https://doi.org/10.1002/2016gc006582 doi:10.1002/2016gc006582 |
op_doi |
https://doi.org/10.1002/2016gc006582 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
11 |
container_start_page |
4333 |
op_container_end_page |
4353 |
_version_ |
1772815219659112448 |