Preliminary Experiment of  Stable p-T Conditions of Methane Hydrate in Quartz Sand with Multistep Dissociation Method

Abstract

Abstract:

An experimental setup used to study the stability conditions of marine hydrate is established, and a preliminary investigation of methane hydrate phase equilibrium (p-T stability conditions) in quartz sand with different pore sizes is developed with multi-step dissociation method. Firstly, the formation and decomposition of methane hydrate in the sodium dodecyl sulfate (SDS) solution are performed to verify the reliability and efficiency of the setup and experimental methods. The obtained experimental data agree well with those from the literatures. Secondly，the stable p-T conditions of methane hydrate in quartz sand sediment and SDS solution are carried out. The particle sizes of quartz sand are 96-180 μm, 180-380 μm, 212-380 μm, and 380-830 μm, respectively. The measured stable p-T conditions of methane hydrate in quartz with various sizes are well consistent with those in pure water solution, suggesting that the pore capillary effect of quartz sand sediment can be ignored.

Key words: multi-step dissociation method, quartz sand, methane hydrate, stable p-T condition

CLC Number:

P736.3

SUN Shi-Cai, YE Yu-Guang, LIU Chang-Ling, TAN Yun-Zhen, MENG Qing-Guo. Preliminary Experiment of Stable p-T Conditions of Methane Hydrate in Quartz Sand with Multistep Dissociation Method[J]. Geoscience, 2010, 24(3): 638-642.

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Preliminary Experiment of Stable p-T Conditions of Methane Hydrate in Quartz Sand with Multistep Dissociation Method

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