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In-situ visual observation for the formation and dissociation of methane hydrates in porous media by magnetic resonance imaging.

Abstract：

:In this work, magnetic resonance imaging (MRI) was employed to observe the in-situ formation and dissociation of methane hydrates in porous media. Methane hydrate was formed in a high-pressure cell with controlled temperature, and then the hydrate was dissociated by thermal injection. The process was photographed by the MRI, and the pressure was recorded. The images confirmed that the direct visual observation was achieved; these were then employed to provide detailed information of the nucleation, growth, and decomposition of the hydrate. Moreover, the saturation of methane hydrate during the dissociation was obtained from the MRI intensity data. Our results showed that the hydrate saturation initially decreased rapidly, and then slowed down; this finding is in line with predictions based only on pressure. The study clearly showed that MRI is a useful technique to investigate the process of methane hydrate formation and dissociation in porous media.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Zhao J,Lv Q,Li Y,Yang M,Liu W,Yao L,Wang S,Zhang Y,Song Y

doi

10.1016/j.mri.2014.12.010

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

485-90

issue

4

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(14)00364-6

journal_volume

33

pub_type

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