Impact of sedimentary mineralogy on geophysical and geomechanical properties of hydrate-bearing sediments

Research output: Contribution to conferencePaper

Abstract

Gas production from gas hydrates and deepwater drilling through hydrate-bearing sediments could severely disturb seafloor stability. Instable seafloor may trigger local subsea landslides, which could lead to the release of large quantities of methane into atmosphere, or wellbore collapse damaging drilling facilities and also causing safety concerns. To have better understanding of the impact of sedimentary mineralogy on the stability of marine sediments containing gas hydrates, a series of experiments were conducted using various mineral compositions of sediments, including silica sand, sand + 7 mass% kaolinite clay, sand + 7 mass% smectite clay, sand + 20 mass% kaolinite clay, sand + 20 mass% smectite clay. Geophysical properties of the sediments were
determined after methane hydrate formation, including density, compressibility, acoustic velocities (both Vp and Vs), and bulk modulus and shear modulus. Results of the experiments show that the sediments containing high concentration of clays have significantly higher compressibility than others tested in this work. Furthermore, under low effective stress, sediments containing
kaolinite showed higher compressibility than those containing the same concentration of smectite. The presence of clays in sand packs seemed to have a greater impact on shear elasticity of hydratebearing sediments than bulk elasticity.
Original languageEnglish
Pages1-9
Number of pages9
Publication statusPublished - Jul 2008
Event6th International Conference on Gas Hydrates - Vancouver, Canada
Duration: 6 Jul 200810 Jul 2008

Conference

Conference6th International Conference on Gas Hydrates
CountryCanada
CityVancouver
Period6/07/0810/07/08

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