Three-dimensional flow and trace metal mobility in shallow Chalk groundwater, Dorset, United Kingdom

Schürch, Marc; Edmunds, W.M.; Buckley, D. K.

doi:10.1016/j.jhydrol.2004.01.004

Cited by 21 publications

(9 citation statements)

References 14 publications

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“…A horizontal hydraulic head gradient of 5‰ was applied to the model domain, which is within the range of reported values from field observations of regional gradients at three other bedrock sites in England [ Dames and Moore , ; Schurch and Buckley , ; Schurch et al ., ]. No reports with regard to upward gradients within the Bowland Shale were available.…”

Section: Methods and Scenariosmentioning

confidence: 99%

Numerical assessment of potential impacts of hydraulically fractured Bowland Shale on overlying aquifers

Cai

Ofterdinger

2014

Water Resources Research

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Natural gas extracted from hydraulically fractured shale formations potentially has a big impact on the global energy landscape. However, there are concerns of potential environmental impacts of hydraulic fracturing of the shale formations, particularly those related to water quality. To evaluate the potential impact of hydraulically fractured shale on overlying aquifers, we conduct realizations of numerical modeling simulations to assess fluid flow and chloride transport from a synthetic Bowland Shale over a period of 11,000 years. The synthetic fractured shale was represented by a three-dimensional discrete fracture model that was developed by using the data from a Bowland Shale gas exploration in Lancashire, UK. Chloride mass exchange between fractures and the rock matrix was fully accounted for in the model. The assessment was carried out to investigate fluid and chloride mass fluxes before, during, and after hydraulic fracturing of the Bowland Shale. Impacts of the upward fracture height and aperture, as well as hydraulic conductivity of the multilayered bedrock system, are also included this assessment. This modeling revealed that the hydraulically fractured Bowland Shale is unlikely to pose a risk to its overlying groundwater quality when the induced fracture aperture is 200 mm. With the fracture aperture 1000 mm, the upward chloride flux becomes very sensitive to the upward fracture height growth and hydraulic conductivity of the multilayered bedrock system. In the extremely unlikely event of the upward fracture growth directly connecting the shale formation to the overlying Sherwood Sandstone aquifer with the fracture aperture 1000 mm, the upward chloride mass flux could potentially pose risks to the overlying aquifer in 100 years. The model study also revealed that the upward mass flux is significantly intercepted by the horizontal mass flux within a high permeable layer between the Bowland Shale and its overlying aquifers, reducing further upward flux toward the overlying aquifers.

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Section: Methods and Scenariosmentioning

confidence: 99%

Numerical assessment of potential impacts of hydraulically fractured Bowland Shale on overlying aquifers

Cai

Ofterdinger

2014

Water Resources Research

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“…Firstly, the transport process follows a complex pattern induced by the dual porosity nature of chalk formations where a network of interconnected fractures crosses the porous carbonate matrix (Mathias et al, 2006;Price et al, 1993). Secondly, the incongruent dissolution of trace alkaline-earth elements trapped in calcite typically takes place in chalk aquifer systems (Edmunds et al, 1987(Edmunds et al, , 1992Elliot et al, 1999;Gillon et al, 2010;Kloppman et al, 1998;Schürch et al, 2004). This process has been evidenced from the evolution of Mg/Ca, Sr/Ca ratios as well as isotopic contents of Sr-C along the flow line.…”

Section: Introductionmentioning

confidence: 99%

Reactive transport modelling of groundwater chemistry in a chalk aquifer at the watershed scale

Mangeret

Windt

Crançon

2012

Journal of Contaminant Hydrology

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“…Models attempt to simulate processes in the subsurface and therefore assist in the management of resources in the subsurface environment. Examples of the use of groundwater models to facilitate the solution of environmental problems are Ophori (1998Ophori ( , 1999, van der Hoven et al (2002), Boronina et al (2003), Schürch et al (2004), andLutz et al (2007). Lutz et al (2007) for instance used a steady state numerical groundwater flow model to determine water balances in the White Volta basin sub-catchment in Nabogo, Ghana.…”

Section: Introductionmentioning

confidence: 99%

A conceptual framework of groundwater flow in some crystalline aquifers in Southeastern Ghana

Yidana

Ganyaglo

Banoeng-Yakubo

et al. 2011

Journal of African Earth Sciences

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Three-dimensional flow and trace metal mobility in shallow Chalk groundwater, Dorset, United Kingdom

Cited by 21 publications

References 14 publications

Numerical assessment of potential impacts of hydraulically fractured Bowland Shale on overlying aquifers

Numerical assessment of potential impacts of hydraulically fractured Bowland Shale on overlying aquifers

Reactive transport modelling of groundwater chemistry in a chalk aquifer at the watershed scale

A conceptual framework of groundwater flow in some crystalline aquifers in Southeastern Ghana

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