| DOI: | 10.1002/2015GL064542
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| 论文题名: | Predicting the permeability of sediments entering subduction zones |
| 作者: | Daigle H.; Screaton E.J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9485
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| EISSN: | 1944-9216
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| 出版年: | 2015
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| 卷: | 42, 期:13 | | 起始页码: | 5219
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| 结束页码: | 5226
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| 语种: | 英语
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| 英文关键词: | effective medium
; Integrated Ocean Drilling Program
; Ocean Drilling Program
; permeability
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| Scopus关键词: | Mechanical permeability
; Submarine geology
; Effective medium
; Effective medium theories
; Integrated ocean drilling programs
; Microstructural control
; Ocean drilling programs
; Permeability prediction
; Primary consolidation
; Sediment permeability
; Sediments
; clay
; convergent margin
; grain size
; microstructure
; Ocean Drilling Program
; permeability
; porosity
; prediction
; sediment analysis
; subduction zone
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| 英文摘要: | Using end-member permeabilities defined by a worldwide compilation of sediment permeabilities at convergent margins, we compare permeability predictions using a geometric mean and a two-component effective medium theory (EMT). Our implementation of EMT includes a threshold fraction of the high-permeability component that determines whether flow occurs dominantly in the high- or low-permeability component. We find that this threshold fraction in most cases is equal to the silt+sand-sized fraction of the sediment. This suggests that sediments undergoing primary consolidation tend to exhibit flow equally distributed between the high- and low-permeability components. We show that the EMT method predicts permeability better than the weighted geometric mean of the end-member values for clay fractions <0.6. This work provides insight into the microstructural controls on permeability in subducting sediments and valuable guidance for locations which lack site-specific permeability results but have available grain-size information. Key Points Effective medium theory predicts permeability better than geometric mean for clay fractions <0.6 The silt+sand fraction is usually abundant enough to form connected flow paths End-member permeabilities are globally valid functions of porosity. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938196967&doi=10.1002%2f2015GL064542&partnerID=40&md5=b49f88ce3f342b1c4edb7bffe916006c
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/9100
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| 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: | Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX, United States
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| Recommended Citation: | |
Daigle H.,Screaton E.J.. Predicting the permeability of sediments entering subduction zones[J]. Geophysical Research Letters,2015-01-01,42(13).
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