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Effect of grain characteristics on the behaviour of disseminated methane hydrate bearing sediments.

Effect of grain characteristics on the behaviour of disseminated methane hydrate bearing sediments.
Effect of grain characteristics on the behaviour of disseminated methane hydrate bearing sediments.
Results of seismic surveys are routinely used to assess the presence of methane hydrate in deep ocean sediments. Accurate estimates of hydrate distribution and volume within the sediment are required to assess the potential of gas hydrate as an energy resource, driver for climate change or as a geotechnical hazard. However, seismic velocity may be affected not only by the quantity and morphology of the hydrate, but also by the properties of the host sediment, for example its particle size distribution and grain shape. This paper reports the results of experiments conducted to determine dynamic geophysical properties such as compressional wave velocity (Vp), shear wave velocity (Vs) and their respective attenuation measurements (Qp-1 and Qs-1) of specimens with varying amounts of disseminated methane hydrate within materials with different particle shapes and sizes. The results show that the impact of disseminated hydrate is affected both by mean particle size and by particle sphericity, with the surface area of the sediment grains influencing the spread of hydrate throughout a material and therefore it’s bonding capabilities. The sediments with 10% hydrate content show the highest surface areas correspond to the least increase in seismic velocity while sediments with low surface areas gives the most. The behaviour of granular soils is known to be influenced by characteristics of the soil such as hydrate bearing sediments.
bonding, grain size, grain shape, disseminated hydrate
Kingston, Emily
375f31ec-6989-4a9c-a3a2-6322c6fe8204
Clayton, Chris
8397d691-b35b-4d3f-a6d8-40678f233869
Priest, Jeffery
c90bd680-0009-4661-8919-71e15c3cf0b5
Best, Angus
cad03726-10f8-4f90-a3ba-5031665234c9
Kingston, Emily
375f31ec-6989-4a9c-a3a2-6322c6fe8204
Clayton, Chris
8397d691-b35b-4d3f-a6d8-40678f233869
Priest, Jeffery
c90bd680-0009-4661-8919-71e15c3cf0b5
Best, Angus
cad03726-10f8-4f90-a3ba-5031665234c9

Kingston, Emily, Clayton, Chris, Priest, Jeffery and Best, Angus (2008) Effect of grain characteristics on the behaviour of disseminated methane hydrate bearing sediments. 6th International Conference on Gas Hydrates (ICGH 2008), , Vancouver, Canada. 06 - 10 Jul 2008. 9 pp .

Record type: Conference or Workshop Item (Poster)

Abstract

Results of seismic surveys are routinely used to assess the presence of methane hydrate in deep ocean sediments. Accurate estimates of hydrate distribution and volume within the sediment are required to assess the potential of gas hydrate as an energy resource, driver for climate change or as a geotechnical hazard. However, seismic velocity may be affected not only by the quantity and morphology of the hydrate, but also by the properties of the host sediment, for example its particle size distribution and grain shape. This paper reports the results of experiments conducted to determine dynamic geophysical properties such as compressional wave velocity (Vp), shear wave velocity (Vs) and their respective attenuation measurements (Qp-1 and Qs-1) of specimens with varying amounts of disseminated methane hydrate within materials with different particle shapes and sizes. The results show that the impact of disseminated hydrate is affected both by mean particle size and by particle sphericity, with the surface area of the sediment grains influencing the spread of hydrate throughout a material and therefore it’s bonding capabilities. The sediments with 10% hydrate content show the highest surface areas correspond to the least increase in seismic velocity while sediments with low surface areas gives the most. The behaviour of granular soils is known to be influenced by characteristics of the soil such as hydrate bearing sediments.

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More information

Published date: 6 July 2008
Venue - Dates: 6th International Conference on Gas Hydrates (ICGH 2008), , Vancouver, Canada, 2008-07-06 - 2008-07-10
Keywords: bonding, grain size, grain shape, disseminated hydrate

Identifiers

Local EPrints ID: 63129
URI: http://eprints.soton.ac.uk/id/eprint/63129
PURE UUID: 5eb76bb6-734f-40e1-a2b0-c95191935335
ORCID for Chris Clayton: ORCID iD orcid.org/0000-0003-0071-8437

Catalogue record

Date deposited: 15 Sep 2008
Last modified: 16 Mar 2024 03:12

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Contributors

Author: Emily Kingston
Author: Chris Clayton ORCID iD
Author: Jeffery Priest
Author: Angus Best

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