Journal
ACTA OCEANOLOGICA SINICA
Volume 33, Issue 10, Pages 30-36Publisher
SPRINGER
DOI: 10.1007/s13131-014-0538-y
Keywords
methane hydrate; equibrium; silica sand; saturation; pore capillary pressure
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Funding
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University [PLN1206]
- National Natural Science Foundation of China [51376114]
- Ministry of Land and Resources research of China [201111026]
- Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science Technology [DMSM201007]
- National Basic Research Program (973 program) of China [2009CB219503]
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To better understand the relationship between the pore capillary pressure and hydrate saturation in sediments, a new method was proposed. First, the phase equilibria of methane hydrate in fine-grained silica sands were measured. As to the equilibrium data, the pore capillary pressure and saturation of methane hydrate were calculated. The results showed that the phase equilibria of methane hydrates in fine-grained silica sands changed due to the depressed activity of pore water caused by the surface group and negatively charged characteristic of silica particles as well as the capillary pressure in small pores together. The capillary pressure increased with the increase of methane hydrate saturation due to the decrease of the available pore space. However, the capillary-saturation relationship could not yet be described quantitatively because of the stochastic habit of hydrate growth.
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