Skip to main content
U.S. flag

An official website of the United States government

Physical properties of repressurized samples recovered during the 2006 National Gas Hydrate Program expedition offshore India

July 17, 2008

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.

Citation Information

Publication Year 2008
Title Physical properties of repressurized samples recovered during the 2006 National Gas Hydrate Program expedition offshore India
DOI 10.14288/1.0041098
Authors William J. Winters, William F. Waite, David H. Mason, P. Kumar
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title
Series Number
Index ID 70178100
Record Source USGS Publications Warehouse
USGS Organization Woods Hole Coastal and Marine Science Center