Geotechnical sampling and testing of gas-charged marine sediments atin situ pressures |
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| Authors: | Mark W Johns Elliott Taylor William R Bryant |
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| Institution: | (1) Department of Oceanography, Texas A & M University, 77843 College Station, TX |
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| Abstract: | Gas-charged marine sediments were sampled using a pressure core barrel and a new technique involving standard wireline sampling
procedures. Pressure core barrel sampling provides sediments atin situ pressures with no degassing. Analysis of gas content, geotechnical properties and microfabric were performed for samples
atin situ pressures and compared with degassed results. Methane concentrations ranged from 3,450 to 137,140 ppm for pressurized samples.
Microfabric analyses reveal highly nonoriented clay particles and grains in degassed samples. Degassing of these methane-rich
sediments increases porosities and compression indices, while reducing undrained shear strengths and computed preconsolidation
pressures. |
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