Model Instance Title:
CASSEM Hypothetical Leakage
Model Instance Short Name:
CASSEM
Description:
The far-field effects of CO2 storage on onshore potable groundwater systems is examined for a hypothetical injection site within the Sherwood Sandstone Group (SSG) on the East Lincolnshire coastline, United Kingdom (UK). Using the quasi-three dimensional object-orientated groundwater flow model ZOOMQ3D, supported by conceptualisation and aquifer parameterisation of the wider hydrogeological setting, injection of 15 Mt/year of CO2 for 20 years (60 Ml/day groundwater equivalent) into the aquifer at depth is simulated. Model scenarios are carried out which test the dissipation of pressures up-dip within the storage formation. When applying typical vertical hydraulic conductivity of 10−6 m/day to the Mercia Mudstone Group (MMG) caprock groundwater pressure heads in the shallow confined SSG aquifer, 60 km up dip, where it is used for potable water supply, increase by 0.01–10 m. Groundwater levels within the unconfined aquifer, 80–100 km up-dip from the injection zone, increase by <0.01–1 m with a corresponding increase in river flows of approximately 1.7%. Two important points are observed, firstly that the degree of impact on shallow groundwater systems is highly sensitive to the vertical leakage assigned to the caprock. When the leakage co-efficient is increased by one order of magnitude groundwater heads in the potable aquifer are reduced by two orders of magnitude. Secondly, that the response of groundwater pressure heads to injection is rapid, as is the subsequent recovery. Using a groundwater model, in addition to detailed reservoir modelling, provides a useful tool to assess the potential scale of impact of CO2 storage on shallow groundwater systems and can be used to aid the regulation of such operations
Creation/Publication Date:
2012
Disciplines:
GROUNDWATER SCIENCE
Contact Details:
| Name | Organisation | Country | Email |
|
Andrew Barkwith
|
British Geological Survey
|
UK
|
andr3@bgs.ac.uk
|
Time Interval Covered:
from:
01-Jan-1970
to:
31-Dec-2090
Spatial Extent:
Bounding Box (Lat/Long WGS84):
West:
-1.256
East:
0.643
South:
53
North:
53.602
Scope of Vertical Extent:
Permo-Triassic Sandstone
Vertical Extent (metres above OD) Maximum:
-400
Minimum:
200
Spatial Reference Systems of Datasets:
Horizontal Reference System:
WGS 84
Vertical Datum:
mean sea level depth
Vertical Units:
metre
Grid Resolution:
| Spacing X | Spacing Y | Spacing Z | Cells X | Cells Y | Cells Z |
|
1000
|
1000
|
|
125
|
70
|
3
|
Time step interval:
month
Time step value:
4
Additional information (science questions addressed, assumptions etc.):
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Science Question
|
What impact does the injection of supercritical CO2 in the Sherwood Sandstone Group aquifer have on the groundwater system up gradient?
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Boundary Condition
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No flow around model; vertical leakage specified where Mercia Mudstone overlies the Sherwood Sandstone Group
|
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Initial Condition
|
Steady state heads
|
Data:
| Input Dataset Name | Version | URL Link | Parameter | Value | Units |
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Input Data
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Geometry of model
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Hydraulic conductivity
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Storage coefficient
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Pumping rate
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Recharge
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| Output Dataset Name | Version | URL Link | Parameter | Value | Units |
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Output Data
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Grounmdwater head
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Flow into and out of Mercia Mudstone
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Documents and Published Papers available for this model instance: