Journal
JOURNAL OF NATURAL GAS CHEMISTRY
Volume 20, Issue 5, Pages 531-536Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-9953(10)60224-1
Keywords
sediment from South China Sea; seafloor water; methane hydrate; stability condition
Funding
- National Basic Research Program of China [2009CB219503]
- Special Fund for Ministry of Land and Resources research of China in the Public Interest [201111026]
- Natural Science Foundation of Shandong Province of China [ZR2009FQ017]
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For reasonable assessment and safe exploitation of marine gas hydrate resource, it is important to determine the stability conditions of gas hydrates in marine sediment. In this paper, the seafloor water sample and sediment sample (saturated with pore water) from Shenhu Area of South China Sea were used to synthesize methane hydrates, and the stability conditions of methane hydrates were investigated by multi-step heating dissociation method. Preliminary experimental results show that the dissociation temperature of methane hydrate both in seafloor water and marine sediment, under any given pressure, is depressed by approximately -1.4 K relative to the pure water system. This phenomenon indicates that hydrate stability in marine sediment is mainly affected by pore water ions.
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