DOI: 10.1002/2016GL069598
论文题名: Fracture sealing by mineral precipitation: The role of small-scale mineral heterogeneity
作者: Jones T.A. ; Detwiler R.L.
刊名: Geophysical Research Letters
ISSN: 0094-8840
EISSN: 1944-8571
出版年: 2016
卷: 43, 期: 14 起始页码: 7564
结束页码: 7571
语种: 英语
英文关键词: Fracture Flow
; Permeability Alteration
; Reactive Transport
Scopus关键词: Calcium carbonate
; Groundwater flow
; Minerals
; Precipitation (chemical)
; Fracture flow
; Low permeability rock
; Mineral precipitation
; Precipitation rates
; Preferential flows
; Randomly distributed
; Reactive transport
; Transparent analogs
; Fracture
英文摘要: Fractures are often leakage pathways for fluid in low-permeability rocks that otherwise act as geologic barriers in the subsurface. Flow of fluids in chemical disequilibrium with fracture surfaces can lead to mineral precipitation and fracture sealing. To directly evaluate the role of small-scale mineral heterogeneity on mineral precipitation, we measured CaCO3 precipitation in a transparent analog fracture that included randomly distributed small-scale regions of CaCO3 on one of the borosilicate surfaces. Steady flow of a well-mixed CaCl2-NaHCO3 solution ((Formula presented.) =Â 1.44) resulted in significant mineral precipitation during the 82Â day experiment. Localized mineral precipitation reduced flow within regions of the fracture, but small-scale reaction-site heterogeneity allowed preferential flow to persist through pathways that contained 82% less area of CaCO3 regions than the fracture-scale average. This resulted in a significant reduction in measured precipitation rate; excluding these effects results in more than an order-of-magnitude underestimation of fracture sealing timescales. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979788906&doi=10.1002%2f2016GL069598&partnerID=40&md5=26cf4714479ecd2191cbda5a2bfa2499
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9803
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 Civil and Environmental Engineering, University of California, Irvine, CA, United States
Recommended Citation:
Jones T.A.,Detwiler R.L.. Fracture sealing by mineral precipitation: The role of small-scale mineral heterogeneity[J]. Geophysical Research Letters,2016-01-01,43(14).