DOI: 10.1002/2015GL064492
论文题名: Thermal conductivity measurements in unsaturated hydrate-bearing sediments
作者: Dai S. ; Cha J.-H. ; Rosenbaum E.J. ; Zhang W. ; Seol Y.
刊名: Geophysical Research Letters
ISSN: 0094-8622
EISSN: 1944-8353
出版年: 2015
卷: 42, 期: 15 起始页码: 6295
结束页码: 6305
语种: 英语
英文关键词: analytical model
; gas production
; hydrate-bearing sediments
; methane hydrate
; single-sided TPS
; thermal conductivity
Scopus关键词: Analytical models
; Gas hydrates
; Hydration
; Ionization of gases
; Methane
; Sediments
; Thermal conductivity of gases
; Thermodynamic properties
; Gas productions
; Hydrate bearing sediments
; Hydrate saturation
; Methane hydrates
; Single-sided TPS
; Thermal conductivity measurements
; Transient plane source techniques
; Water redistribution
; Thermal conductivity
; gas hydrate
; gas production
; hysteresis
; measurement method
; methane
; numerical model
; sediment analysis
; thermal conductivity
英文摘要: Current database on the thermal properties of hydrate-bearing sediments remains limited and has not been able to capture their consequential changes during gas production where vigorous phase changes occur in this unsaturated system. This study uses the transient plane source (TPS) technique to measure the thermal conductivity of methane hydrate-bearing sediments with various hydrate/water/gas saturations. We propose a simplified method to obtain thermal properties from single-sided TPS signatures. Results reveal that both volume fraction and distribution of the pore constituents govern the thermal conductivity of unsaturated specimens. Thermal conductivity hysteresis is observed due to water redistribution and fabric change caused by hydrate formation and dissociation. Measured thermal conductivity increases evidently when hydrate saturation Sh > 30-40%, shifting upward from the geometric mean model prediction to a Pythagorean mixing model. These observations envisage a significant drop in sediment thermal conductivity when residual hydrate/water saturation falls below ∼40%, hindering further gas production. ∼40% ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940449792&doi=10.1002%2f2015GL064492&partnerID=40&md5=27891a1468d6c28ca5a9a7bbbbbd9ec2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8238
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: National Energy Technology Laboratory, U.S. Department of Energy, Morgantown, WV, United States
Recommended Citation:
Dai S.,Cha J.-H.,Rosenbaum E.J.,et al. Thermal conductivity measurements in unsaturated hydrate-bearing sediments[J]. Geophysical Research Letters,2015-01-01,42(15).