Geology of the Andover area: Concealed strata: Difference between revisions

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__NOTOC__
{{AndoverSE}}
{{AndoverSE}}
==Geological description==


===CONCEALED STRATA===
There are six deep hydrocarbons boreholes, within or adjacent to the Andover district, which provide evidence of the strata encountered at depth. '''Figure P807821''' shows the location of the boreholes and the Stratal thickness table details the stratal thicknesses within each. Seismic sections show that Ordovician to Carboniferous strata form the basement beneath the area.


There are six deep hydrocarbons boreholes, within or adjacent to the Andover district, which provide evidence of the strata encountered at depth. '''Figure 3''' shows the location of the boreholes and '''Figure 4''' details the stratal thicknesses within each. Seismic sections show that Ordovician to Carboniferous strata form the basement beneath the area.
{|class="wikitable" style="background-color:#F0F8FF; margin:auto;"
|+ '''Stratal thickness table'''<br>Key hydrocarbons boreholes and deeper wells in the Andover district and adjacent areas.
|-
| '''Strata'''
| '''Kingsclere'''
| '''Egbury 1'''
| '''Upper Enham 1'''
| '''Ham 1'''
| '''Hurstbourne Tarrant'''
| '''Carnarvon Arms'''
|-
| Borehole number
| SU45NE 1
| SU45SW 46
| SU35SE 23
| SU36SW 1
| SU35SE 27
| SU45NE 3
|-
| Grid reference
| 49840 58200
| 44484 52364
| 36598 50430
| 33100 62470
| 36032 53500
| 45720 59450
|-
| Palaeogene
| Absent
| Absent
| Absent
| Absent
| Absent
| 124.6
|-
| White Chalk


<center>
Subgroup
{| class="wikitable" width="100pt" style="margin-left:0px; margin-right:0px; margin-bottom:10px; float:center; text-align:left;"
| Absent
| <img src="https://bgsintranet/asset-bank/action/directLinkImage?assetId=396133&width=381&height=273">
| 170.6
| Absent
| Absent
| rowspan="2" | 217.6
| 12.5+
|-
|-
| '''Figure 3''' Location of key deep hydrocarbons boreholes in the Andover district and adjacent areas. [https://bgsintranet/asset-bank/action/viewFullSizedImage?id=396133&size=1000 P807821].
| Grey Chalk
|}
</center>


Additional data in nearby deep wells such as Farley South, Stockbridge, Lockerly and Humbly Grove can be found in '''Hopson et al. (2007), Booth (2002) and Farrant (2002)'''.
Subgroup
| Absent
| 68.4
| Absent
| 18.3
|
|-
| Upper Greensand


== Geology of the Andover area - contents ==
Formation
| 33.8
| 70.0
| 57.7
| 42.7
| 62.8
|
|-
| Gault Formation
| 86.6
| 41.0
| 58.7
| 84.1
| 55.5
|
|-
| Lower Greensand


[[Geology of the Andover area: Introduction|Introduction]]
Group
| 13.7
| 10.5
| 11.3
| 4.8
| 10.4
|
|-
| Wealden ‘Group’
| 178.9
| 118.5
| 127.1
| 11.0+
| 125.9
|
|-
| Purbeck Group
| 164.3
| 43.5
| 53.8
|
| 36.3
|
|-
| Portland Group
| 43.6
| 46.0
| 53.4
|
| 50.0
|
|-
| Kimmeridge Clay


: [[Geology of the Andover area: Geological setting|Geological setting]]
Formation
| 284.4
| 187.5
| 203.2
|
| 218.2
|
|-
| Corallian Group
| 53.6
| 58.0
| 57.5
|
| 125.0
|
|-
| Oxford Clay


'''Geological description '''
Formation
| 95.1
| 117.3
| 132.7
|
| 25.0
|
|-
| Kellaways Formation
| 9.1
| 10.5
| 14.0
|
| 14.0
|
|-
| Great Oolite Group
| 85.0
| 93.9
| 108.1
|
| 61.0
|
|-
| Inferior Oolite


: '''Concealed strata'''
Group
 
| 109.4
:: [[Geology of the Andover area: Concealed strata - Ordovician to Devonian|Ordovician to Devonian]]
| 48.3
 
| 75.9
:: [[Geology of the Andover area: Concealed strata - Carboniferous|Carboniferous]]
|
 
| 118.3
:: [[Geology of the Andover area: Concealed strata - Permian|Permian]]
|
 
|-
:: [[Geology of the Andover area: Concealed strata - Triassic|Triassic]]
| Lias Group†
 
| 360.9+
:: [[Geology of the Andover area: Concealed strata - Jurassic|Jurassic]]
| 377.7
 
| 495.5
:: [[Geology of the Andover area: Concealed strata - Cretaceous|Cretaceous]]
|
 
| 38.4+
: [[Geology of the Andover area: Exposed strata - Upper Greensand Formation|Exposed Strata]]
|
 
|-
:: [[Geology of the Andover area: Exposed strata - Upper Greensand Formation|Upper Greensand Formation (UGS)]]
| Penarth Group
 
|
:: [[Geology of the Andover area: Exposed strata - Chalk Group|Chalk Group]]
| 9.3
 
| 28.5+
:: [[Geology of the Andover area: Exposed strata - Palaeogene|Palaeogene]]
|
 
|
:: [[Geology of the Andover area: Exposed strata - Quaternary|Quaternary]]
|
 
|-
:: [[Geology of the Andover area: Exposed strata - Artificial ground|Artificial ground]]
| Permo-Triassic
 
|
[[Geology of the Andover area: Applied geology - Hydrogeology|Applied geology]]
| Absent
 
|
: [[Geology of the Andover area: Applied geology - Hydrogeology|Hydrogeology]]
|
|
|
|-
| Ordovician to Carboniferous
|
| 29.0+
|
|
|
|
|}
<center>
Notes:
†The Lias Group undivided encompasses the old divisions of Lower, Middle and Upper Lias. Modern terminology that can be<br>applied to the strata encountered in these boreholes is discussed on the Jurassic page.
</center>


: [[Geology of the Andover area: Applied geology - Bulk minerals|Bulk minerals]]


: [[Geology of the Andover area: Applied geology - Geotechnical considerations and hazards|Geotechnical considerations and hazards]]
[[Image:P807821.jpg|thumb|center|500px|Location of key deep hydrocarbons boreholes in the Andover district and adjacent areas. P807821.]]


[[Geology of the Andover area: Information resources|Information resources]]
Additional data in nearby deep wells such as Farley South, Stockbridge, Lockerly and Humbly Grove can be found in '''Hopson et al. (2007)<ref>Hopson, P M, Farrant, A R, Newell, A J, Marks, R J, Booth, K A, Bateson, L B, Woods, M A, Wilkinson, I P, Brayson, J, and Evans, D J. 2007. Geology of the Salisbury district. Sheet Explanation of the British Geological Survey. Sheet 298 (England and Wales).</ref>, Booth (2002)<ref>Booth, K A. 2002. Geology of the Winchester district. ''Sheet Explanation of the British Geological Survey.''Sheet 299 (England and Wales).</ref> and Farrant (2002)'''<ref>Farrant, A R. 2002. Geology of the Alresford district. ''Sheet Explanation of the British Geological Survey.''Sheet 300 (England and Wales).</ref>.


[[Geology of the Andover area: References|References]]
==References==
<References/>


== Geology of the Andover area — contents ==
{{Andoverpages}}


[[Category:Andover - the geology of the area| 003]]
[[Category:Andover - the geology of the area| 003]]

Latest revision as of 08:47, 4 December 2015

This page is part of a category of pages providing a summary of the geology of the Andover district (British Geological Survey Sheet 283), which extends over approximately 600 km2 of north-west Hampshire and a small part of eastern Wiltshire. Links to other pages in this category can be found at the foot of the page.
Authors: J Thompson, K A Lee, P M Hopson, A R Farrant, A J Newell, R J Marks, L B Bateson, M A Woods, I P Wilkinson and N J Smith.

There are six deep hydrocarbons boreholes, within or adjacent to the Andover district, which provide evidence of the strata encountered at depth. Figure P807821 shows the location of the boreholes and the Stratal thickness table details the stratal thicknesses within each. Seismic sections show that Ordovician to Carboniferous strata form the basement beneath the area.

Stratal thickness table
Key hydrocarbons boreholes and deeper wells in the Andover district and adjacent areas.
Strata Kingsclere Egbury 1 Upper Enham 1 Ham 1 Hurstbourne Tarrant Carnarvon Arms
Borehole number SU45NE 1 SU45SW 46 SU35SE 23 SU36SW 1 SU35SE 27 SU45NE 3
Grid reference 49840 58200 44484 52364 36598 50430 33100 62470 36032 53500 45720 59450
Palaeogene Absent Absent Absent Absent Absent 124.6
White Chalk

Subgroup

Absent 170.6 Absent Absent 217.6 12.5+
Grey Chalk

Subgroup

Absent 68.4 Absent 18.3
Upper Greensand

Formation

33.8 70.0 57.7 42.7 62.8
Gault Formation 86.6 41.0 58.7 84.1 55.5
Lower Greensand

Group

13.7 10.5 11.3 4.8 10.4
Wealden ‘Group’ 178.9 118.5 127.1 11.0+ 125.9
Purbeck Group 164.3 43.5 53.8 36.3
Portland Group 43.6 46.0 53.4 50.0
Kimmeridge Clay

Formation

284.4 187.5 203.2 218.2
Corallian Group 53.6 58.0 57.5 125.0
Oxford Clay

Formation

95.1 117.3 132.7 25.0
Kellaways Formation 9.1 10.5 14.0 14.0
Great Oolite Group 85.0 93.9 108.1 61.0
Inferior Oolite

Group

109.4 48.3 75.9 118.3
Lias Group† 360.9+ 377.7 495.5 38.4+
Penarth Group 9.3 28.5+
Permo-Triassic Absent
Ordovician to Carboniferous 29.0+

Notes: †The Lias Group undivided encompasses the old divisions of Lower, Middle and Upper Lias. Modern terminology that can be
applied to the strata encountered in these boreholes is discussed on the Jurassic page.


Location of key deep hydrocarbons boreholes in the Andover district and adjacent areas. P807821.

Additional data in nearby deep wells such as Farley South, Stockbridge, Lockerly and Humbly Grove can be found in Hopson et al. (2007)[1], Booth (2002)[2] and Farrant (2002)[3].

References

  1. Hopson, P M, Farrant, A R, Newell, A J, Marks, R J, Booth, K A, Bateson, L B, Woods, M A, Wilkinson, I P, Brayson, J, and Evans, D J. 2007. Geology of the Salisbury district. Sheet Explanation of the British Geological Survey. Sheet 298 (England and Wales).
  2. Booth, K A. 2002. Geology of the Winchester district. Sheet Explanation of the British Geological Survey.Sheet 299 (England and Wales).
  3. Farrant, A R. 2002. Geology of the Alresford district. Sheet Explanation of the British Geological Survey.Sheet 300 (England and Wales).

Geology of the Andover area — contents