HR: 1340h
AN: OS23A-1030    [Abstracts]
TI: The simulation of Methane hydrate crystal growth by Monte-Carlo Method
AU: * Ikeda, H
EM: ikeda@earth.kumst.kyoto-u.ac.jp
AF: Kyoto university, nishikyokukyotodaigakukatsuraC-1-1-118, kyoto, 6158540, Japan
AU: Miranda, C r
EM: caetano.miranda@gmail.com
AF: kyoto university, nishikyokukyotodaigakukatsuraC-1-1-155, kyoto, 6158540, Japan
AU: Matsuoka, T
EM: matsuoka@earth.kumst.kyoto-u.ac.jp
AF: kyoto university, nishikyokukyotodaigakukatsuraC-1-1-109, kyoto, 6158540, Japan
AB: Recently, methane hydrate has been expected as a new and promising energy resource, and it abundantly occurs under the deep-sea beds. However, there is still a considerable technical and economical problem for a practical exploration of methane hydrate as an energy resource. For example, it is considerable difficult to control the stability of the methane hydrate reservoirs. In this way, it is fundamental to know and predict the process that controls the methane hydrate formation in order to produce it safely and efficiently. In this study, we simulate the process of methane hydrate crystal growth with CO2 substitution. We have adopted the combination of cellular automata with Monte Carlo method in a similar way as suggested by Buenas, Kvamme and Svandal (J. of Crystal Growth – 2006). The effects of CO2 substitution on methane hydrate growth will be investigated by considering diffusion of both species (CO2 and methane) and using the free energy of the systems that has been obtained by molecular dynamics calculations and thermodynamic data. The growth process is investigated under the relevant thermodynamic conditions (temperature and pressure) of methane hydrate reservoirs and takes in account three main physical effects: solidification of the liquid hydrate, the diffusion of the molecular species (CO2 and CH4) and the heat transport.
DE: 3004 Gas and hydrate systems
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting