Threshold Values for Identification of Contamination Predicted by Reduced-Order Models

Murray, Christopher J L; Bott, Yi-Ju; Brown, Christopher F.

doi:10.1016/j.egypro.2014.11.389

Cited by 11 publications

(18 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The noimpact thresholds, determined for a specific aquifer, are useful as they allow for better prediction of potential impacts to an aquifer, as opposed to using regulatory standards, such as MCLs. Last et al, 2013), Qafoku et al (2015) …”

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

“…In some cases, the calculated no-impact threshold values may exceed regulatory standards. Other approaches, such as the hybrid intrawell-interwell approach also examined in the study by Last et al (2013) The hydrology ROMs and chemical scaling functions generated in the Generation III ROM (Zheng et al, 2014) were specific to threshold values that represent no net degradation to the groundwater quality. The impact thresholds defined for pH, TDS, trace metals, and select organics in Table 6 represent concentrations above (or below for pH) the background water chemistry that could be used to assess impact from brine and/or CO2 leakage into the aquifer.…”

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

“…The study by Last et al (2013) examined selected portions of the urban shallowunconfined aquifer system of the Edwards aquifer and a portion of the High Plains aquifer. No-impact threshold values were determined for Cd, Pb, As, Cr, pH, TDS, and select organic compounds that could be used to identify potential areas of contamination predicted by numerical models of storage reservoirs.…”

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

“…In order to determine whether CO2 and brine leakage has an impact on groundwater quality, a protocol needs to be established for determining statistically significant changes in groundwater concentrations of regulated contaminants (Last et al, 2013).…”

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

“…Ninety water samples from the shallow, unconfined portion of the Edwards aquifer in Texas, collected as part of the NAWQA Program (Musgrove et al, 2010), were used to examine methodologies for establishing baseline data sets and protocols for determining statistically significant changes between background concentrations and predicted concentrations that would be used to represent a contamination plume in modeling simulations (Last et al, 2013). Initial values of As, Ba, Cd, Pb, benzene, naphthalene, phenol, pH, and TDS concentrations were also determined using selected statistical methods (Table 7; the EPA MCLs are also shown for comparison).…”

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

See 4 more Smart Citations

Review of the impacts of leaking CO2 gas and brine on groundwater quality

Qafoku

Lawter

Bacon

et al. 2017

Earth-Science Reviews

View full text Add to dashboard Cite

This paper provides an overview of the existing data and knowledge presented in recent literature about the potential leaking of CO2 from the deep subsurface storage reservoirs and the effects on groundwater quality. The objectives are to: 1) present data and discuss potential risks associated with the groundwater quality degradation due to CO2 gas and brine exposure; 2) identify the set of geochemical data required to develop models to assess and predict aquifer responses to CO2 and brine leakage; and 3) present a summary of the findings and reveal future trends in this important and expanding research area. The discussion is focused around aquifer responses to CO2 gas and brine exposure and the degree of impact; major hydrogeological and geochemical processes and site-specific properties known to control aquifer quality under CO2 exposure conditions; contributions from the deep reservoirs (plume characteristics and composition); and the possibility of establishment of a new network of reactions and processes affecting or controlling the overall mobility of major, minor, and trace elements and the fate of the elements released from sediments or transported with brine. This paper also includes a discussion on the development of conceptual and reduced order models (ROMs) to describe and predict aquifer responses and whether or not the release of metals following exposure to CO2 is harmful, which are an essential tool for CO2 sequestration related risk assessment. Future research needs in this area are also included at the end of the paper.

show abstract

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

Section: Threshold Values and Average Groundwater Concentrationsmentioning

confidence: 99%

See 3 more Smart Citations

Review of the impacts of leaking CO2 gas and brine on groundwater quality

Qafoku

Lawter

Bacon

et al. 2017

Earth-Science Reviews

View full text Add to dashboard Cite

show abstract

A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration

Varadharajan¹,

Tinnacher²,

Trautz³

et al. 2018

Geological Carbon Storage

View full text Add to dashboard Cite

Controlling potential far‐field brine leakage from CO₂ storage formations using deep extraction wells: Numerical and experimental testing

Askar¹,

Illangasekare

2022

Greenhouse Gases

View full text Add to dashboard Cite

Injecting CO 2 into deep geologic formations for storage purposes induces large pressure build-up that risks caprock integrity. Naturally occurring faults or pressure-induced fractures in the caprock can act as conductive leakage pathways resulting in potential contamination of the overlying shallow aquifers. Previous studies explored using brine extraction to manage such elevated pressure in the storage formation. In this paper, we extended the use of this technique to control far-field brine leakage. Extraction wells are placed in the storage zone to reduce the leakage flow through reversing the pressure-gradient locally, while minimizing the brine concentrations in the escaped-fraction by utilizing the dilution capacity of the overlying formations. The developed approach incorporated the Genetic Algorithm with transport model simulations to optimize well-placements and extraction-rates. An approximately 8m long intermediate-scale tank designed to mimic brine leakage migration in the field was used to validate this approach as field data are not available. We further evaluated the approach numerically using a hypothetical leakage scenario at the Vedder storage formation in San-Joaquin basin to assess its practicality for field implementation. The results showed that storage zone heterogeneity and fractures' permeabilities can significantly affect the optimum locations and pumping rates of the extraction wells. Brine leakage can be controlled by extracting a native-brine volume less than 50% of the injected CO 2 volume. The target concentrations in the shallow aquifer determines the extraction rates required to control a leakage through a fracture or a buried thrust fault. The study is useful to develop remediation strategies for carbon storage operations.

show abstract

Threshold Values for Identification of Contamination Predicted by Reduced-Order Models

Cited by 11 publications

References 5 publications

Review of the impacts of leaking CO2 gas and brine on groundwater quality

Review of the impacts of leaking CO2 gas and brine on groundwater quality

A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration

Controlling potential far‐field brine leakage from CO₂ storage formations using deep extraction wells: Numerical and experimental testing

Contact Info

Product

Resources

About

Threshold Values for Identification of Contamination Predicted by Reduced-Order Models

Cited by 11 publications

References 5 publications

Review of the impacts of leaking CO2 gas and brine on groundwater quality

Review of the impacts of leaking CO2 gas and brine on groundwater quality

A Review of Studies Examining the Potential for Groundwater Contamination From CO 2 Sequestration

Controlling potential far‐field brine leakage from CO2 storage formations using deep extraction wells: Numerical and experimental testing

Contact Info

Product

Resources

About

A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration

Controlling potential far‐field brine leakage from CO₂ storage formations using deep extraction wells: Numerical and experimental testing