The methane hydrate formation and the methane hydrate dissociation behaviors in montmorillonite are experimentally studied. Through the analyses of the microstructure characteristic, the study obtains the porous characteristic of montmorillonite. It is indicated that methane hydrate in montmorillonite forms the structure I (si) crystal. Meanwhile, molecular dynamics simulation is carried out to study the processes of the methane hydrate formation and the methane hydrate dissociation in montmorillonite. The microstructure and microscopic properties are analyzed. The methane hydrate formation and methane hydrate dissociation mechanisms in the montmorillonite nanopore and on the montmorillonite surface are expounded. Combining the experimental and simulating analyses, the results indicate the methane hydrate formation and methane hydrate dissociation processes have little influence upon the crystal structure of porous media from either micro- or macro-analysis. It is beneficial to the fundamental researches on the exploitation and security control technologies of natural gas hydrate in deep-sea sediments.
Chinese Journal of Chemical Engineering
the Key Program of National Natural Science Foundation of China (51736009)
the Natural Science Foundation of Guangdong Province of China (2017A030313301)
the Special project for marine economy development of Guangdong Province (GDME-2018D002)
the National Key R&D Program of China (2016YFC0304002, 2017YFC0307306)
the Science and Technology Apparatus Development Program of the Chinese Academy of Sciences (YZ201619)
the National Natural Science Foundation of China (51476147, 51879254)
the Frontier Sciences Key Research Program of the Chinese Academy of Sciences (QYZDJ-SSW-JSC033).
Corresponding author:Xiaosen Li, at: Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.E-mail address: firstname.lastname@example.org (X.Li).