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International Conference on Gas Hydrates (ICGH) (6th : 2008)
PHYSICAL PROPERTIES OF REPRESSURIZED SAMPLES RECOVERED DURING THE 2006 NATIONAL GAS HYDRATE PROGRAM EXPEDITION OFFSHORE INDIA Winters, W.J.; Waite, W.F.; Mason, D.H.; Kumar, P.
Abstract
As part of an international cooperative research program, the U.S. Geological Survey (USGS) and researchers from the National Gas Hydrate Program (NGHP) of India are studying the physical properties of sediment recovered during the NGHP-01 cruise conducted offshore India during 2006. Here we report on index property, acoustic velocity, and triaxial shear test results for samples recovered from the Krishna-Godavari Basin. In addition, we discuss the effects of sample storage temperature, handling, and change in structure of fine-grained sediment. Although complex, sub-vertical planar gas-hydrate structures were observed in the silty clay to clayey silt samples prior to entering the Gas Hydrate And Sediment Test Laboratory Instrument (GHASTLI), the samples yielded little gas post test. This suggests most, if not all, gas hydrate dissociated during sample transfer. Mechanical properties of hydrate-bearing marine sediment are best measured by avoiding sample depressurization. By contrast, mechanical properties of hydrate-free sediments, that are shipped and stored at atmospheric pressure can be approximated by consolidating core material to the original in situ effective stress.
Item Metadata
Title |
PHYSICAL PROPERTIES OF REPRESSURIZED SAMPLES RECOVERED DURING THE 2006 NATIONAL GAS HYDRATE PROGRAM EXPEDITION OFFSHORE INDIA
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Creator | |
Contributor | |
Date Issued |
2008-07
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Description |
As part of an international cooperative research program, the U.S. Geological Survey (USGS) and
researchers from the National Gas Hydrate Program (NGHP) of India are studying the physical
properties of sediment recovered during the NGHP-01 cruise conducted offshore India during
2006. Here we report on index property, acoustic velocity, and triaxial shear test results for
samples recovered from the Krishna-Godavari Basin. In addition, we discuss the effects of sample
storage temperature, handling, and change in structure of fine-grained sediment.
Although complex, sub-vertical planar gas-hydrate structures were observed in the silty clay to
clayey silt samples prior to entering the Gas Hydrate And Sediment Test Laboratory Instrument
(GHASTLI), the samples yielded little gas post test. This suggests most, if not all, gas hydrate
dissociated during sample transfer. Mechanical properties of hydrate-bearing marine sediment are
best measured by avoiding sample depressurization. By contrast, mechanical properties of
hydrate-free sediments, that are shipped and stored at atmospheric pressure can be approximated
by consolidating core material to the original in situ effective stress.
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Extent |
2796247 bytes
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Subject | |
Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2016-11-21
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0041098
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URI | |
Affiliation | |
Citation |
Winters, W.J.; Waite, W.F.; Mason, D.H.; Kumar, P. 2008. PHYSICAL PROPERTIES OF REPRESSURIZED SAMPLES RECOVERED DURING THE 2006 NATIONAL GAS HYDRATE PROGRAM EXPEDITION OFFSHORE INDIA. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
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Peer Review Status |
Unreviewed
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DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International