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.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/1475 |
| Date | 07 1900 |
| Creators | Winters, W.J., Waite, W.F., Mason, D.H., Kumar, P. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
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