KOPRI Repository

The impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic region

Cited 0 time in wos
Cited 0 time in scopus
Title
The impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic region
Other Titles
북극 해저 천연 가스하이드레이트의 열역학적 안정조건에 미치는 공극수 내 높은 염분농도의 영향
Authors
Choi, Wonjung
Lee, Joonseop
Kim, Young-Gyun
Kim, Hanwoong
Rhee, Tae Siek
Jin, Young Keun
Kim, Ji-Hoon
Seo, Yongwon
Subject
Environmental Sciences & Ecology
Keywords
ArcticNatural gas hydratesSalinityStructure IThermodynamic stabilitySaturation
Issue Date
2021-12-10
Citation
Choi, Wonjung, et al. 2021. "The impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic region". SCIENCE OF THE TOTAL ENVIRONMENT, 799: 1-9.
Abstract
In this study, the thermodynamic and structural characteristics of natural gas hydrates (NGHs) retrieved from gas hydrate mounds (ARAON Mound 03 (AM03) and ARAON Mound 06 (AM06)) in the Chukchi Sea in the Arctic region were investigated. The gas compositions, crystalline structure, and cage occupancy of the NGHs at AM03 and AM06 were experimentally measured using gas chromatography (GC), C-13 nuclear magnetic resonance (NMR), Raman spectroscopy, and powder X-ray diffraction (PXRD). In the NGHs from AM03 and AM06, a significantly large fraction of CH4 (> 99%) and a very small amount of H2S were enclathrated in small (5(12)) and large (5(12)6(2)) cages of sl hydrate. The NGHs from AM03 and AM06 were almost identical in composition, guest distri- butions, and existing environment to each other. The salinity of the residual pore water in the hydrate-bearing sediment (AM06) was measured to be 50.32 parts per thousand, which was much higher than that of seawater (34.88 parts per thousand). This abnormal salinity enrichment in the pore water of the low-permeability sediment might induce the dissociation of NGHs at a lower temperature than expected. The saturation changes in the NGHs that corresponded with an increase in the seawater temperature were also predicted on the basis of the salinity changes in the pore water. The experimental and predicted results of this study would be helpful for understanding the thermodynamic stability of NGHs and potential CH4-releasing phenomena in the Arctic region. (C) 2021 Elsevier B.V. All rights reserved.
URI
https://repository.kopri.re.kr/handle/201206/13012
DOI
http://dx.doi.org/10.1016/j.scitotenv.2021.149357
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2021-2021, Survey of Geology and Seabed Environmental Change in the Arctic Seas (21-21) / Hong, Jong Kuk (PM21050)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse