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.
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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