View source for OR/18/012 Appendix 1 - 3DGWV screening methodology, spreadsheet tool and example for low vulnerability scenario

__NOTOC__
{{OR/18/012}}
<center>
{| class="wikitable"
|- style="vertical-align:top;"
| '''Geological unit'''
| '''Lithology'''
| '''Depth top (M OD)'''
| '''Depth base (M OD)'''
| '''Thickness of unit (M)'''
| '''Vertical separation between source and base of receptor (M)'''
| '''Unit mudstone thickness (M)'''
| '''Cumulative mudstone thickness (M) in intervening units'''
| '''EA aquifer designation'''
| '''Potential receptor classification'''
| '''Unit flow type (for receptor classes A to C)'''
| '''Cumulative flow type (for receptor classes A to C) including receptor'''
| '''Notes'''
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Chalk Group
| style="background-color: #ccffff;" | Chalk with subsidiary mudstone, flint and limestone
| style="background-color: #ccffff;" | 81
| style="background-color: #ccffff;" | -10
| style="background-color: #aeaaaa;" | 91
| style="background-color: #cccccc;" | 325
| style="background-color: #ccffff;" | 45.5
| style="background-color: #cccccc;" | 178
| style="background-color: #ccffff;" | Principal
| style="background-color: #ccffff;" | A
| style="background-color: #ccffff;" | Fractured, well connected
| style="background-color: #ccffff;" | >50% intergranular flow
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Gault Formation
| style="background-color: #ccffff;" | Clay, mudstone and sandstone with subsidiary calcareous mudstone, chalk, conglomerate, limestone, sand, silt and siltstone
| style="background-color: #ccffff;" | -10
| style="background-color: #ccffff;" | -90
| style="background-color: #aeaaaa;" | 80
| style="background-color: #cccccc;" | 245
| style="background-color: #ccffff;" | 80
| style="background-color: #cccccc;" | 98
| style="background-color: #ccffff;" | Unproductive in this region
| style="background-color: #ccffff;" | D
| style="background-color: #ccffff;" | Not A to C
| style="background-color: #ccffff;" | >50% intergranular flow
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Lower Greensand Formation
| style="background-color: #ccffff;" | Sand and sandstone with subsidiary clay and silt
| style="background-color: #ccffff;" | -75
| style="background-color: #ccffff;" | -139
| style="background-color: #aeaaaa;" | 64
| style="background-color: #cccccc;" | 196
| style="background-color: #ccffff;" | 0
| style="background-color: #cccccc;" | 98
| style="background-color: #ccffff;" | Principal
| style="background-color: #ccffff;" | A
| style="background-color: #ccffff;" | Intergranular flow
| style="background-color: #ccffff;" | >50% intergranular flow
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Weald Group
| style="background-color: #ccffff;" | Mudstone, sandstone and siltstone
| style="background-color: #ccffff;" | -139
| style="background-color: #ccffff;" | -279
| style="background-color: #aeaaaa;" | 140
| style="background-color: #cccccc;" | 56
| style="background-color: #ccffff;" | 70
| style="background-color: #cccccc;" | 28
| style="background-color: #ccffff;" | Secondary in this area
| style="background-color: #ccffff;" | B
| style="background-color: #ccffff;" | Intergranular flow
| style="background-color: #ccffff;" | >50% intergranular flow
| style="background-color: #ffff99;" |Closest outcrop in Weald where both secondary and unproductive aquifer, take most sensitive&nbsp;—&nbsp; secondary
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Purbeck Group
| style="background-color: #ccffff;" | Limestone and mudstone with subsidiary gypsum-stone and non-carbonate salt rock
| style="background-color: #ccffff;" | -279
| style="background-color: #ccffff;" | -335
| style="background-color: #aeaaaa;" | 56
| style="background-color: #cccccc;" | 0
| style="background-color: #ccffff;" | 28
| style="background-color: #cccccc;" | 0
| style="background-color: #ccffff;" | Secondary
| style="background-color: #ccffff;" | B
| style="background-color: #ccffff;" | Fractured, well connected
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | <span style="color:#ff0000">Portland Group</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">Limestone, sand and sandstone with subsidiary calcareous sandstone, chert and mudstone</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">-335</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">-352</span>
| style="background-color: #aeaaaa;" | <span style="color:#ff0000">17</span>
| style="background-color: #cccccc;" | <span style="color:#ff0000">0</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000"> 0</span>
| style="background-color: #cccccc;" | <span style="color:#ff0000"> 0</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">Principal and secondary</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">A</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">Fractured, well connected</span>
| style="background-color: #ccffff;" | <span style="color:#ff0000">>50% fractured, well connected</span>
| style="background-color: #ffff99;" | <span style="color:#ff0000">Isle of Purbeck where limestone is Principal</span>
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Kimmeridge Clay
| style="background-color: #ccffff;" | Mudstone with subsidiary argillaceous, muddy limestone/cementstone/calcilutite, limestone, sand, sandstone, sapropelite, silt and siltstone
| style="background-color: #ccffff;" | -352
| style="background-color: #ccffff;" | -555
| style="background-color: #aeaaaa;" | 203
| style="background-color: #cccccc;" | 0
| style="background-color: #ccffff;" | 203
| style="background-color: #cccccc;" | 0
| style="background-color: #ccffff;" | Unproductive
| style="background-color: #ccffff;" | D
| style="background-color: #ccffff;" | Not A to C
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Corallian Group
| style="background-color: #ccffff;" | Mudstones, siltstones and argillaceous limestones
| style="background-color: #ccffff;" | -555
| style="background-color: #ccffff;" | -607
| style="background-color: #aeaaaa;" | 52
| style="background-color: #cccccc;" | 203
| style="background-color: #ccffff;" | 26
| style="background-color: #cccccc;" | 203
| style="background-color: #ccffff;" | Principal and secondary
| style="background-color: #ccffff;" | C
| style="background-color: #ccffff;" | Fractured, well connected
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |Closest outcrop near Weymouth, where it is Secondary
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Kellaways and Oxford Clay Formations
| style="background-color: #ccffff;" | Silicate-mudstone, silicate-sandstone and silicate siltstone
| style="background-color: #ccffff;" | -607
| style="background-color: #ccffff;" | -828
| style="background-color: #aeaaaa;" | 221
| style="background-color: #cccccc;" | 255
| style="background-color: #ccffff;" | 221
| style="background-color: #cccccc;" | 229
| style="background-color: #ccffff;" | Unproductive
| style="background-color: #ccffff;" | D
| style="background-color: #ccffff;" | Not A to C
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Great Oolite Group
| style="background-color: #ccffff;" | Calcareous mudstone, limestone, mudstone and ooidal limestone
| style="background-color: #ccffff;" | -828
| style="background-color: #ccffff;" | -902
| style="background-color: #aeaaaa;" | 74
| style="background-color: #cccccc;" | 476
| style="background-color: #ccffff;" | 0.5
| style="background-color: #cccccc;" | 450
| style="background-color: #ccffff;" | Principal
| style="background-color: #ccffff;" | B
| style="background-color: #ccffff;" | Fractured, well connected
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Inferior Oolite Group
| style="background-color: #ccffff;" | Limestone, ooidal limestone
| style="background-color: #ccffff;" | -902
| style="background-color: #ccffff;" | -963
| style="background-color: #aeaaaa;" | 61
| style="background-color: #cccccc;" | 550
| style="background-color: #ccffff;" | 0
| style="background-color: #cccccc;" | 450.5
| style="background-color: #ccffff;" | Principal
| style="background-color: #ccffff;" | B
| style="background-color: #ccffff;" | Fractured, well connected
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" |
|- style="vertical-align:top;"
| style="background-color: #ccffff;" | Lias Group
| style="background-color: #ccffff;" | Calcareous mudstone, mudstone and silty mudstone
| style="background-color: #ccffff;" | -963
| style="background-color: #ccffff;" | -1200
| style="background-color: #aeaaaa;" | 237
| style="background-color: #cccccc;" | 611
| style="background-color: #ccffff;" | 237
| style="background-color: #cccccc;" | 450.5
| style="background-color: #ccffff;" | Principal, secondary and unproductive, closest outcrop is east of Lyme Regis, both secondary and unproductive
| style="background-color: #ccffff;" | C
| style="background-color: #ccffff;" | Fractured, not well connected
| style="background-color: #ccffff;" | >50% fractured, well connected
| style="background-color: #ffff99;" | Secondary as most sensitive classification and no principal in this area
|}
</center>
<span style="font-size:86%">''Conceptual geological model for the southeast England, conventional oil and gas, in the spreadsheet tool. Unit highlighted in red indicates the target formation.<br>Blue indicates squares where data is inputted, grey are calculated and yellow indicates notes and justifications.''</span>

<center>

{| class="wikitable"
|- style="vertical-align:bottom;"
| '''Factor'''
| colspan="2" | '''Release mechanism of hydrocarbon (H<sub>1</sub>)'''
| colspan="2" | '''Head gradient driving flow (H<sub>2</sub>)'''
| ! scope="col" style="width: 75px;" rowspan="2" | '''Hazard score'''
| ! scope="col" style="width: 575px0px;" rowspan="2" | '''Confidence'''
|-
| ! scope="col" style="width: 200px;" | '''Geological unit'''
| ! scope="col" style="width: 75px;" | '''Ranking'''
| ! scope="col" style="width: 75px;" | '''Confidence'''
| ! scope="col" style="width: 75px;" | '''Rating'''
| ! scope="col" style="width: 75px;" | '''Confidence'''
|-
| style="background-color: #ccffcc;" | Chalk Group
| style="background-color: #ffcc99;" rowspan="11" |
| style="background-color: #ffcc99;" rowspan="11" |
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Gault Formation
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Lower Greensand Formation
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Weald Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Purbeck Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Portland Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Kimmeridge Clay
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Corallian Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Kellaways and Oxford Clay Formations
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Great Oolite Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Inferior Oolite Group
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| style="background-color: #ccffcc;" | Lias Group
| style="background-color: #ffcc99;" | 1
| style="background-color: #ffcc99;" | high
| style="background-color: #f8cbad;" | 2
| style="background-color: #f8cbad;" | low
| style="background-color: #cccccc;" | 2
| style="background-color: #cccccc;" | low
|-
| Notes
| style="background-color: #ffff99;" colspan="6" | 
|}
</center>
<span style="font-size:86%">''Hazard score for the southeast England, conventional oil and gas, from the spreadsheet tool. Green squares indicates cell has been carried forward, orange is an option with a pull-down menu.''</span>
<center>
{| class="wikitable"
|- style="vertical-align:top;"
| '''Factor'''
| colspan="2" | '''Vertical separation between source and base of receptor      '''
| colspan="2" | '''Lateral separation between source and receptor      '''
| colspan="2" | '''Mudstones and clays in intervening units between source and receptor      '''
|-
| Weighting (w)
| colspan="2" | 1.5
| colspan="2" | 3
| colspan="2" | 3.5
|-
| Confidence
| style="background-color: #ffcc99;" colspan="2" | low
| style="background-color: #ffcc99;" colspan="2" | medium
| style="background-color: #ffcc99;" colspan="2" | medium
|-
| Geological unit
| colspan="2" | 
| colspan="2" |
| colspan="2" | 
|-
| ! scope="col" style="width: 200px;" style="background-color: #ccffcc;" | Chalk Group
| ! scope="col" style="width: 75px;" style="background-color: #ffcc99;" | 5
| ! scope="col" style="width: 75px;" style="background-color: #cccccc;" | 7.5
| ! scope="col" style="width: 75px;" style="background-color: #ffcc99;" | 0
| ! scope="col" style="width: 75px;" style="background-color: #cccccc;" | 0
| ! scope="col" style="width: 75px;" style="background-color: #ffcc99;" | 2
| ! scope="col" style="width: 75px;" style="background-color: #cccccc;" | 7

|-
| style="background-color: #ccffcc;" | Gault Formation
| style="background-color: #ffcc99;" | 6
| style="background-color: #cccccc;" | 9
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 3
| style="background-color: #cccccc;" | 10.5
|-
| style="background-color: #ccffcc;" | Lower Greensand Formation
| style="background-color: #ffcc99;" | 7
| style="background-color: #cccccc;" | 10.5
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 3
| style="background-color: #cccccc;" | 10.5
|-
| style="background-color: #ccffcc;" | Weald Group
| style="background-color: #ffcc99;" | 8
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 2
| style="background-color: #cccccc;" | 6
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 14
|-
| style="background-color: #ccffcc;" | Purbeck Group
| style="background-color: #ffcc99;" | 8
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 5
| style="background-color: #cccccc;" | 17.5
|-
| style="background-color: #ccffcc;" | Portland Group
| style="background-color: #ffcc99;" | 8
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 5
| style="background-color: #cccccc;" | 17.5
|-
| style="background-color: #ccffcc;" | Kimmeridge Clay
| style="background-color: #ffcc99;" | 8
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 12
| style="background-color: #ffcc99;" | 5
| style="background-color: #cccccc;" | 17.5
|-
| style="background-color: #ccffcc;" | Corallian Group
| style="background-color: #ffcc99;" | 7
| style="background-color: #cccccc;" | 10.5
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 2
| style="background-color: #cccccc;" | 7
|-
| style="background-color: #ccffcc;" | Kellaways and Oxford Clay Formations
| style="background-color: #ffcc99;" | 6
| style="background-color: #cccccc;" | 9
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 2
| style="background-color: #cccccc;" | 7
|-
| style="background-color: #ccffcc;" | Great Oolite Group
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 6
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 1
| style="background-color: #cccccc;" | 3.5
|-
| style="background-color: #ccffcc;" | Inferior Oolite Group
| style="background-color: #ffcc99;" | 4
| style="background-color: #cccccc;" | 6
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 1
| style="background-color: #cccccc;" | 3.5
|-
| style="background-color: #ccffcc;" | Lias Group
| style="background-color: #ffcc99;" | 3
| style="background-color: #cccccc;" | 4.5
| style="background-color: #ffcc99;" | 0
| style="background-color: #cccccc;" | 0
| style="background-color: #ffcc99;" | 1
| style="background-color: #cccccc;" | 3.5
|-
| Notes
| style="background-color: #ffff99;" colspan="6" | Only upper three units are penetrated by boreholes
|}
</center>
<center>
{| class="wikitable"
|- style="vertical-align:top;"
| '''Factor'''
| ! scope="col" style="width:300px;" colspan="2" | '''Groundwater flow  mechanism in intervening units between source and receptor, including the receptor      '''
| ! scope="col" style="width: 50px;" colspan="2" | '''Faults cutting intervening units and receptor      '''
| ! scope="col" style="width: 50px;" colspan="2" | '''Solution features in intervening units and receptor      '''
| ! scope="col" style="width: 50px;" colspan="2" | '''Anthropogenic features&nbsp;—&nbsp;mines close to site of interest'''
| ! scope="col" style="width: 50px;" colspan="2" | '''Anthropogenic features&nbsp;—&nbsp;boreholes close to site of interest      '''
| ! scope="col" style="width: 50px;" colspan="2" | '''Intrinsic vulnerability score (V)'''
|-
| Weighting (w)
| colspan="2" | 3
| colspan="2" | 4.5
| colspan="2" | 2

| colspan="2" | 8
| colspan="2" | 4
| colspan="2" |

|-
| Confidence
| style="background-color: #ffcc99;" colspan="2" | medium
| style="background-color: #ffcc99;" colspan="2" | medium
| style="background-color: #ffcc99;" colspan="2" | medium
| style="background-color: #ffcc99;" colspan="2" | high
| style="background-color: #ffcc99;" colspan="2" | high
| style="background-color: #cccccc;" | low

|-
| Geological unit
| colspan="2" | 
| colspan="2" |
| colspan="2" | 
|-
| ! style="background-color: #ccffcc;" | Chalk Group
| ! style="background-color: #ffcc99;" | 1
| ! style="background-color: #cccccc;" | 3
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 4
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 8
| ! style="background-color: #cccccc;" | 38.5
|-
| ! style="background-color: #ccffcc;" | Gault Formation
| ! style="background-color: #ffcc99;" | 1
| ! style="background-color: #cccccc;" | 3
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>

| ! style="background-color: #cccccc;" | 2

| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 8
| ! style="background-color: #cccccc;" | 41.5
|-
| ! style="background-color: #ccffcc;" | Lower Greensand Formation
| ! style="background-color: #ffcc99;" | 1
| ! style="background-color: #cccccc;" | 3
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 8
| ! style="background-color: #cccccc;" | 43
|-
| ! style="background-color: #ccffcc;" | Weald Group
| ! style="background-color: #ffcc99;" | 1
| ! style="background-color: #cccccc;" | 3
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 8
| ! style="background-color: #cccccc;" | 54
|-
| ! style="background-color: #ccffcc;" | Purbeck Group
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 8
| ! style="background-color: #cccccc;" | 69.5
|-
| ! style="background-color: #ccffcc;" | <span style="color:#ff0000">Portland Group</span>
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">3</span>
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">9</span>
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">2</span>
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">9</span>
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">2</span>
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">0</span>
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">8</span>
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">69.5</span>
|-
| ! style="background-color: #ccffcc;" |  Kimmeridge Clay
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 61.5
|-
| ! style="background-color: #ccffcc;" |  Corallian Group
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 37.5
|-
| ! style="background-color: #ccffcc;" |  Kellaways and Oxford Clay Formations
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 36
|-
| ! style="background-color: #ccffcc;" |  Great Oolite Group
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 29.5
|-
| ! style="background-color: #ccffcc;" |  Inferior Oolite Group
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 29.5
|-
| ! style="background-color: #ccffcc;" | Lias Group
| ! style="background-color: #ffcc99;" | 3
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | 2
| ! style="background-color: #cccccc;" | 9
| ! style="background-color: #ffcc99;" | <span style="color:#ff0000">1</span>
| ! style="background-color: #cccccc;" | 2
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #ffcc99;" | 0
| ! style="background-color: #cccccc;" | 0
| ! style="background-color: #cccccc;" | 28
|- style="vertical-align:top;"
| Notes
| style="background-color: #ffff99;" colspan="2" | 
| style="background-color: #ffff99;" colspan="2" | Fault possibly 1&nbsp;km from activity
| style="background-color: #ffff99;" colspan="2" | Portland group has potential for solution features, and evidence from BH log in chalk
| style="background-color: #ffff99;" colspan="2" |  
| style="background-color: #ffff99;" colspan="2" | Below target, no  boreholes.<br>Boreholes in village.
| style="background-color: #ffff99;" |

|}

<span style="font-size:86%">''Intrinsic vulnerability for units between the hydrocarbon source unit and potential receptor,<br>and the potential receptor itself, for southeast England, conventional oil and gas.''</span>
</center>
<center>
{| class="wikitable"
|- style="vertical-align:top;"
| ! scope="col" style="width: 200px;" | '''Geological unit'''
| ! scope="col" style="width: 100px;" | '''Receptor classification'''
| ! scope="col" style="width: 100px;" | '''Vulnerability score (V)'''
| ! scope="col" style="width: 100px;" | '''Risk Score (R)'''
|-
| ! style="background-color: #ccffcc;" | Chalk Group
| ! style="background-color: #ccffcc;" | A
| ! style="background-color: #ccffcc;" | 41.5
| ! style="background-color: #cccccc;" | 83
|-
| ! style="background-color: #ccffcc;" | Gault Formation
| ! style="background-color: #ccffcc;" | D
| ! style="background-color: #ccffcc;" | 41.5
| ! style="background-color: #cccccc;" | 83
|-
| ! style="background-color: #ccffcc;" | Lower Greensand Formation
| ! style="background-color: #ccffcc;" | A
| ! style="background-color: #ccffcc;" | 43
| ! style="background-color: #cccccc;" | 86
|-
| ! style="background-color: #ccffcc;" | Weald Group
| ! style="background-color: #ccffcc;" | B
| ! style="background-color: #ccffcc;" | 54
| ! style="background-color: #cccccc;" | 108
|-
| ! style="background-color: #ccffcc;" | Purbeck Group
| ! style="background-color: #ccffcc;" | B
| ! style="background-color: #ccffcc;" | 69.5
| ! style="background-color: #cccccc;" | 139
|-
| ! style="background-color: #ccffcc;" | <span style="color:#ff0000">Portland Group</span>
| ! style="background-color: #ccffcc;" | <span style="color:#ff0000">A</span>
| ! style="background-color: #ccffcc;" | <span style="color:#ff0000">69.5</span>
| ! style="background-color: #cccccc;" | <span style="color:#ff0000">139</span>
|-
| ! style="background-color: #ccffcc;" | Kimmeridge Clay
| ! style="background-color: #ccffcc;" | D
| ! style="background-color: #ccffcc;" | 61.5
| ! style="background-color: #cccccc;" | 123
|-
| ! style="background-color: #ccffcc;" | Corallian Group
| ! style="background-color: #ccffcc;" | C
| ! style="background-color: #ccffcc;" | 37.5
| ! style="background-color: #cccccc;" | 75
|-
| ! style="background-color: #ccffcc;" | Kellaways and Oxford Clay Formations
| ! style="background-color: #ccffcc;" | D
| ! style="background-color: #ccffcc;" | 36
| ! style="background-color: #cccccc;" | 72
|-
| ! style="background-color: #ccffcc;" | Great Oolite Group
| ! style="background-color: #ccffcc;" | B
| ! style="background-color: #ccffcc;" | 29.5
| ! style="background-color: #cccccc;" | 59
|-
| ! style="background-color: #ccffcc;" | Inferior Oolite Group
| ! style="background-color: #ccffcc;" | B
| ! style="background-color: #ccffcc;" | 29.5
| ! style="background-color: #cccccc;" | 59
|-
| ! style="background-color: #ccffcc;" | Lias Group
| ! style="background-color: #ccffcc;" | C
| ! style="background-color: #ccffcc;" | 28
| ! style="background-color: #cccccc;" | 56
|-
| colspan="2" | <p align="center">Confidence</p>
| ! style="background-color: #ccffcc;" | Low
| ! style="background-color: #ccffcc;" | Low
|}
<span style="font-size:86%">''Risk score for potential receptors for southeast England, conventional oil and gas.''</span>
</center>
[[Category: OR/18/012 3D groundwater vulnerability  | 12]]