DOI: 10.5194/hess-21-2751-2017
Scopus记录号: 2-s2.0-85020465543
论文题名: Regional-scale brine migration along vertical pathways due to CO2 injection - Part 2: A simulated case study in the North German Basin
作者: Kissinger A ; , Noack V ; , Knopf S ; , Konrad W ; , Scheer D ; , Class H
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 6 起始页码: 2751
结束页码: 2775
语种: 英语
Scopus关键词: Aquifers
; Brines
; Carbon dioxide
; Digital storage
; Geologic models
; Geology
; Groundwater
; Groundwater resources
; Hydrogeology
; Injection (oil wells)
; Mercury (metal)
; Potable water
; Risk assessment
; Saline water
; Salt water intrusion
; Water injection
; Computational demands
; Deep saline aquifers
; Geological features
; Geological modeling
; Ground water recharge
; Model simplification
; Surface boundary conditions
; Variable-density flows
; Two phase flow
; aquifer
; boundary condition
; brine
; carbon dioxide
; drinking water
; environmental fate
; groundwater
; leakage
; model test
; parameterization
; recharge
; regional pattern
; risk assessment
; saline intrusion
; salinization
; solute transport
; vertical movement
; North German Basin
英文摘要: Saltwater intrusion into potential drinking water aquifers due to the injection of CO2 into deep saline aquifers is one of the hazards associated with the geological storage of CO2. Thus, in a site-specific risk assessment, models for predicting the fate of the displaced brine are required. Practical simulation of brine displacement involves decisions regarding the complexity of the model. The choice of an appropriate level of model complexity depends on multiple criteria: the target variable of interest, the relevant physical processes, the computational demand, the availability of data, and the data uncertainty. In this study, we set up a regional-scale geological model for a realistic (but not real) onshore site in the North German Basin with characteristic geological features for that region. A major aim of this work is to identify the relevant parameters controlling saltwater intrusion in a complex structural setting and to test the applicability of different model simplifications. The model that is used to identify relevant parameters fully couples flow in shallow freshwater aquifers and deep saline aquifers. This model also includes variable-density transport of salt and realistically incorporates surface boundary conditions with groundwater recharge. The complexity of this model is then reduced in several steps, by neglecting physical processes (two-phase flow near the injection well, variable-density flow) and by simplifying the complex geometry of the geological model. The results indicate that the initial salt distribution prior to the injection of CO2 is one of the key parameters controlling shallow aquifer salinization. However, determining the initial salt distribution involves large uncertainties in the regional-scale hydrogeological parameterization and requires complex and computationally demanding models (regional-scale variable-density salt transport). In order to evaluate strategies for minimizing leakage into shallow aquifers, other target variables can be considered, such as the volumetric leakage rate into shallow aquifers or the pressure buildup in the injection horizon. Our results show that simplified models, which neglect variable-density salt transport, can reach an acceptable agreement with more complex models. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79159
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Hydromechanics and Modelling of Hydrosystems, University Stuttgart, Pfaffenwaldring 61, Stuttgart, Germany; Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, Hannover, Germany; DIALOGIK, Lerchenstraße 22, Stuttgart, Germany; ITAS, Karlsruhe Institute of Technology, Karlstrasse 11, Karlsruhe, Germany
Recommended Citation:
Kissinger A,, Noack V,, Knopf S,et al. Regional-scale brine migration along vertical pathways due to CO2 injection - Part 2: A simulated case study in the North German Basin[J]. Hydrology and Earth System Sciences,2017-01-01,21(6)