Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica
A suite of petropysical measurements - velocity versus pressure, bulk density, porosity, matrix density, and magnetic susceptibility -was undertaken on 63 core plugs from CRP-2A. These data are used to calibrate neutron, resistivity, and magnetic susceptibility well logs. Agreement between core-plug...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.510751 2023-05-15T13:42:09+02:00 Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica Brink, Jason Jarrard, Richard D LATITUDE: -77.005980 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-16T07:30:00 * DATE/TIME END: 1998-11-25T14:20:00 2000-08-30 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.510751 https://doi.org/10.1594/PANGAEA.510751 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.510751 https://doi.org/10.1594/PANGAEA.510751 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Brink, Jason; Jarrard, Richard D (2000): Petrophysics of core plugs from CRP-2A drillhole, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 231-240, hdl:10013/epic.28278.d001 14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.510751 2023-01-20T07:30:59Z A suite of petropysical measurements - velocity versus pressure, bulk density, porosity, matrix density, and magnetic susceptibility -was undertaken on 63 core plugs from CRP-2A. These data are used to calibrate neutron, resistivity, and magnetic susceptibility well logs. Agreement between core-plug magnetic susceptibility measurements and both well-log and whole-core data is excellent. Comparison of core-plug bulk densities with continious well-log density records shows very good agreement. Core-plug measurements of matrix density permit conversion of the well-log and whole-core density records to porosity. Sands and muds exhibit similar downhole compaction patterns, and both patterns are consistent with 250 ± 150 m of exhumation. Pervasive cementation, particularly in the lower half of the core, has affected many CRP-2A petrophysical parameters: (1) fractional porosities are reduced by about 0.05 - 0.10 in the lower part of the hole; (2) velocity and porosity rebound are much smaller than is usually observed for unconsolidated sediments with burial depths similar to CRP-2A; (3) velocities are unusually insensitive to pressure, suggesting that any exhumation-induced microcracks have been scaled subsequently; (4) the velocity/porosity relationship lacks the characteristic signature of exhumation-induced microcracks; (5) the velocity/porosity relationship changes with depth, indicating downhole increase in consolidation; (6) Vp/Vs ratios of the highest-porosity sediments are unusually low, implying enhancement of framework stiffness. Dataset Antarc* Antarctica Ross Sea PANGAEA - Data Publisher for Earth & Environmental Science Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) Roberts Cape ENVELOPE(163.200,163.200,-77.033,-77.033) Ross Sea ENVELOPE(163.719450,163.719450,-77.005980,-77.005980) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice |
spellingShingle |
14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice Brink, Jason Jarrard, Richard D Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
topic_facet |
14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice |
description |
A suite of petropysical measurements - velocity versus pressure, bulk density, porosity, matrix density, and magnetic susceptibility -was undertaken on 63 core plugs from CRP-2A. These data are used to calibrate neutron, resistivity, and magnetic susceptibility well logs. Agreement between core-plug magnetic susceptibility measurements and both well-log and whole-core data is excellent. Comparison of core-plug bulk densities with continious well-log density records shows very good agreement. Core-plug measurements of matrix density permit conversion of the well-log and whole-core density records to porosity. Sands and muds exhibit similar downhole compaction patterns, and both patterns are consistent with 250 ± 150 m of exhumation. Pervasive cementation, particularly in the lower half of the core, has affected many CRP-2A petrophysical parameters: (1) fractional porosities are reduced by about 0.05 - 0.10 in the lower part of the hole; (2) velocity and porosity rebound are much smaller than is usually observed for unconsolidated sediments with burial depths similar to CRP-2A; (3) velocities are unusually insensitive to pressure, suggesting that any exhumation-induced microcracks have been scaled subsequently; (4) the velocity/porosity relationship lacks the characteristic signature of exhumation-induced microcracks; (5) the velocity/porosity relationship changes with depth, indicating downhole increase in consolidation; (6) Vp/Vs ratios of the highest-porosity sediments are unusually low, implying enhancement of framework stiffness. |
format |
Dataset |
author |
Brink, Jason Jarrard, Richard D |
author_facet |
Brink, Jason Jarrard, Richard D |
author_sort |
Brink, Jason |
title |
Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
title_short |
Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
title_full |
Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
title_fullStr |
Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
title_full_unstemmed |
Petrophysical investigations on sediment core CRP-2A from the Ross Sea, Antarctica |
title_sort |
petrophysical investigations on sediment core crp-2a from the ross sea, antarctica |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.510751 https://doi.org/10.1594/PANGAEA.510751 |
op_coverage |
LATITUDE: -77.005980 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-16T07:30:00 * DATE/TIME END: 1998-11-25T14:20:00 |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(163.200,163.200,-77.033,-77.033) ENVELOPE(163.719450,163.719450,-77.005980,-77.005980) |
geographic |
Cape Roberts Roberts Cape Ross Sea |
geographic_facet |
Cape Roberts Roberts Cape Ross Sea |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_source |
Supplement to: Brink, Jason; Jarrard, Richard D (2000): Petrophysics of core plugs from CRP-2A drillhole, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 231-240, hdl:10013/epic.28278.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.510751 https://doi.org/10.1594/PANGAEA.510751 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.510751 |
_version_ |
1766163124664139776 |