Resistivity changes of natural gas hydrate formation and dissociation in sediments

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  • 1.Department of Chemical Engineering and Resource Recycling,Wuzhou University,Wuzhou 543000,China;2.Key Laboratory of Natural Gas Hydrate,Chinese Academy of Sciences,Guangzhou 510640,China;3.Key Laboratory   of Gas Hydrate, Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266071,China; 4.Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266071,China

Received date: 2018-06-14

  Revised date: 2018-09-06

  Online published: 2018-12-19

Abstract

The electrical resistivity changes during the process of natural gas hydrate (NGH) formation and dissociation in the sediments is very important for NGH exploration in the seabed areas.In this work,the resistivity of 99.9% methane-3.5% sodium chloride solution-South China Sea sediments system was measured under cyclic temperature during NGH formation and dissociation simulating the conditions of hydrate formation in subsea sediments.The results showed that the resistivity of sediments decreased from 4.493Ω·m to 3.173Ω·m during the initial stage of hydrate growth.Then,the resistivity increased rapidly and reached a maximum value of 3.933Ω·m.It finally stabilized at 3.494Ω·m.In the hydrate dissociation process,the resistivity slowly decreased from 6.763Ω·m to 2.675Ω·m and finally stabilized at around 2.411Ω·m when the system reached equilibrium state.The temperature cycling could promote the hydrate formation in sediments.After a temperature cycle,the hydrate saturation increased from 21.8% to 82.17%  and the resistivity increased from 3.494Ω·m to 6.763Ω·m.

Cite this article

Chen Yu-feng, Zhou Xue-bing, Liang De-qing, Wu Neng-you . Resistivity changes of natural gas hydrate formation and dissociation in sediments[J]. Natural Gas Geoscience, 2018 , 29(11) : 1672 -1678 . DOI: 10.11764/j.issn.1672-1926.2018.08.017

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