Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin
About 97 400km of the coastal and offshore areas of the Beaufort-Mackenzie Basin were studied in the region from 68° to 71°N, and 130° to 137°30′W. Salinity of formation waters ranges up to 46 000mg/l at depths of 4km and shows evidence of extensive flushing by meteoric waters. Statistical multi-res...
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Canadian Society of Petroleum Geologists
1990
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:318740 2023-05-15T17:09:25+02:00 Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin Hitchon, B. Underschultz, J. R. Bachu, S. Sauveplane, C. M. 1990-06-01 https://espace.library.uq.edu.au/view/UQ:318740 eng eng Canadian Society of Petroleum Geologists issn:0007-4802 orcid:0000-0003-2151-1478 Energy & Fuels Engineering Petroleum Geosciences Multidisciplinary Geology 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1907 Geology 2102 Energy Engineering and Power Technology Journal Article 1990 ftunivqespace 2020-08-05T08:49:23Z About 97 400km of the coastal and offshore areas of the Beaufort-Mackenzie Basin were studied in the region from 68° to 71°N, and 130° to 137°30′W. Salinity of formation waters ranges up to 46 000mg/l at depths of 4km and shows evidence of extensive flushing by meteoric waters. Statistical multi-response permutation procedures demonstrate that, despite this deep flushing, it is also possible to distinguish formation waters from geopressure zones that had their composition modified by the membrane effects of shales. The top of the main geopressure zone lies at depths of about 2km beneath Richards island and increases in depth basinward to ~5km/ It is suggested that the main geopressure zone was already in existence sometime during the middle of the Tertiary, with its top lying at about 2km depth. Basinal uplift and erosion in the period from 6 to 5Ma was associated with extensive influx of meteoric water, which biodegraded the earlier formed hydrocrabons. Pliocene to Recent sediments of the Iperk sequence were deposited during a major basinal downwarp, with up to 3.5km being deposited far offshore. The geothermal regime has been able to adjust to this downwarping but the pre-Pliocene geopressure zone has not, and as a result still lies about 2km below the base of the Iperk sequence. Hydrocarbons, in the Mackenzie Bay and Kugmallit sequences (Miocene and Oligocene, respectively) occur above the main geopressure zone. -from Authors Article in Journal/Newspaper Mackenzie Basin Mackenzie Bay Richards Island The University of Queensland: UQ eSpace Mackenzie Bay ENVELOPE(70.583,70.583,-68.617,-68.617) |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Energy & Fuels Engineering Petroleum Geosciences Multidisciplinary Geology 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1907 Geology 2102 Energy Engineering and Power Technology |
spellingShingle |
Energy & Fuels Engineering Petroleum Geosciences Multidisciplinary Geology 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1907 Geology 2102 Energy Engineering and Power Technology Hitchon, B. Underschultz, J. R. Bachu, S. Sauveplane, C. M. Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
topic_facet |
Energy & Fuels Engineering Petroleum Geosciences Multidisciplinary Geology 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1907 Geology 2102 Energy Engineering and Power Technology |
description |
About 97 400km of the coastal and offshore areas of the Beaufort-Mackenzie Basin were studied in the region from 68° to 71°N, and 130° to 137°30′W. Salinity of formation waters ranges up to 46 000mg/l at depths of 4km and shows evidence of extensive flushing by meteoric waters. Statistical multi-response permutation procedures demonstrate that, despite this deep flushing, it is also possible to distinguish formation waters from geopressure zones that had their composition modified by the membrane effects of shales. The top of the main geopressure zone lies at depths of about 2km beneath Richards island and increases in depth basinward to ~5km/ It is suggested that the main geopressure zone was already in existence sometime during the middle of the Tertiary, with its top lying at about 2km depth. Basinal uplift and erosion in the period from 6 to 5Ma was associated with extensive influx of meteoric water, which biodegraded the earlier formed hydrocrabons. Pliocene to Recent sediments of the Iperk sequence were deposited during a major basinal downwarp, with up to 3.5km being deposited far offshore. The geothermal regime has been able to adjust to this downwarping but the pre-Pliocene geopressure zone has not, and as a result still lies about 2km below the base of the Iperk sequence. Hydrocarbons, in the Mackenzie Bay and Kugmallit sequences (Miocene and Oligocene, respectively) occur above the main geopressure zone. -from Authors |
format |
Article in Journal/Newspaper |
author |
Hitchon, B. Underschultz, J. R. Bachu, S. Sauveplane, C. M. |
author_facet |
Hitchon, B. Underschultz, J. R. Bachu, S. Sauveplane, C. M. |
author_sort |
Hitchon, B. |
title |
Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
title_short |
Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
title_full |
Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
title_fullStr |
Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
title_full_unstemmed |
Hydrogeology, geopressures and hydrocarbon occurrences, Beaufort-Mackenzie Basin |
title_sort |
hydrogeology, geopressures and hydrocarbon occurrences, beaufort-mackenzie basin |
publisher |
Canadian Society of Petroleum Geologists |
publishDate |
1990 |
url |
https://espace.library.uq.edu.au/view/UQ:318740 |
long_lat |
ENVELOPE(70.583,70.583,-68.617,-68.617) |
geographic |
Mackenzie Bay |
geographic_facet |
Mackenzie Bay |
genre |
Mackenzie Basin Mackenzie Bay Richards Island |
genre_facet |
Mackenzie Basin Mackenzie Bay Richards Island |
op_relation |
issn:0007-4802 orcid:0000-0003-2151-1478 |
_version_ |
1766065515765170176 |