HR: 0830h
AN: OS51B-0843    [PDF]
TI: Properties of Porous Media Flow in Sand Column with Gas Hydrates
AU: * Sakamoto, Y
EM: sakamoto-yasuhide@aist.go.jp
AF: AIST, Japan, 16-1, Onogawa, AIST-West, Tsukuba, 305-8569 Japan
AU: Kawabe, Y
EM: y-kawabe@aist.go.jp
AF: AIST, Japan, 16-1, Onogawa, AIST-West, Tsukuba, 305-8569 Japan
AU: Minagawa, H
EM: h-minagawa@aist.go.jp
AF: AIST, Japan, 16-1, Onogawa, AIST-West, Tsukuba, 305-8569 Japan
AU: Komai, T
EM: koma@ni.aist.go.jp
AF: AIST, Japan, 16-1, Onogawa, AIST-West, Tsukuba, 305-8569 Japan
AU: Yamaguchi, T
EM: t-yamaguchi@aist.go.jp
AF: AIST, Japan, 16-1, Onogawa, AIST-West, Tsukuba, 305-8569 Japan
AB: Gas hydrate is one of the potential resources of natural gas in the near future, because it exists in marine sediments or in permafrost regions worldwide. It is very important to understand the porous media flow in marine sediments with gas hydrate formation, especially in developing the extraction system for gas hydrates, and when considering the environmental impacts due to the development. We have designed and made the special type experimental apparatus, in which the properties of multiphase flow and transport could be measured by a method of high pressure and low temperature technology. Methane gas and water migrate in marine sediments during the dissociation of gas hydrates in the reservoir. An experiment on the measurement of water permeability was conducted using an experimental apparatus, composed of a high-pressure vessel filled with various kinds of sand grains. In this experiment we observed the flow rate in sand column, Darcy law_fs parameters, pressure and temperature as functions of hydrate saturation, porosity, and multiphase conditions. Relative water permeability, the ratio of water permeability compared with absolute permeability without ant hydrate formation, was measured and analyzed as a function of hydrate saturation in porous media. The change in properties of permeability was also measured in the process of formation and dissociation of gas hydrates. As a result, the properties for permeability and saturation can be evaluated as the practical parameters for the simulation of porous media flow in marine sediments. Further, the extraction system by heat stimulation method was considered for the practical mining method for gas hydrates.
DE: 1055 Organic geochemistry
DE: 1635 Oceans (4203)
DE: 3022 Marine sediments--processes and transport
DE: 4806 Carbon cycling
DE: 4820 Gases
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting