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Date of
Discovery
Reservoir Age
Reservoir Formation
22/30a-16 May 1997
Late Jurassic (22/30a-16
discovery)
Triassic (Lead 22/30A)
Fulmar Formation (22/30a-16
discovery)
Skagerrak Formation (Lead 22/30A)
Trap
Area
Test
Estimated Reserves
Stacked tilt-block closures
of the Upper Jurassic
Fulmar Formation (22/30a16 discovery) and the
Triassic Heron Group
(undrilled)
Central North
Sea
Not tested
22/30a-16 discovery (Fulmar Fm.):
Gas reserves of: 11 - 15 - 20 bcf
Discovery Well:
Block: 22/30d
Lead 22/30A (Heron Group):
Gas reserves of: 38 - 57 - 74 bcf
Contour interval = 250 ft
Mapped on 3D
(see 1:100k top Triassic map for Lead 22/30A)
Stratigraphic
Column
0 metres
SCOTER
1-3
12
18500
170
19000
Km
16000
1
2
50
0
182
1
22/30e Shell
0
0
1675
1700
SHEARWATER
19
0
50
0
18000
1800
50
177
00
0
00
Lead
22/30B
22/30b
Shell
22/30d
22/30a-16
NE
Eocene to Recent
Geological Cross Section
Paleocene
SW
Depth
(ft)
14000
4.5
LATE
JUR.
Late Cretaceous
to early Paleocene
(Chalk Group)
4.0
CROMER
KNOLL GP.
12000
Late Jurassic
(Fulmar Fm.)
17000
Late Jurassic
(Humber Group)
22/30a-16
6.0
Lead 22/30A
Triassic
(Heron Group)
20000
1km
2000
10000
MORAY GP./
MONTROSE GP.
4000
15000
5000
HUMBER GROUP
FULMAR FM.
Pentland Fm.
6000
Middle Jurassic
(Pentland Formation)
21000
HERON
GROUP
Early Cretaceous
(Cromer Knoll Group)
FLADEN
GROUP
15000
5.0
5000
3000
3.5
Depth
(km)
EOCENE - QUATERNARY
17
16
0 feet
Sea Bed
296 ft
1000
PALEOCENE
0
23/26c Reach 28th Round potential award
00
LATE CRETACEOUS
18
of A 22/30a-16
e
n discovery
Linctio
se
TRIASSIC
16
50
0
0
CHALK GROUP
00
STRONSAY GROUP to NORDLAND GROUP
5
19
EARLY
CRET.
HERON
Depth TVDSS
14
22/30a Shell
Fulmar Formation absent or
subcrops the Cretaceous
MID
JUR.
6
Depth TVDSS
Horizon: Depth to top Fulmar Formation (ft)
20000
Skagerrak Fm.
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Wells drilled
in part-block
Two
Reservoir Age
Reservoir Formation
Lead 22/30B: Late Jurassic
Lead 22/30C: Middle Jurassic
Lead 22/30D: Triassic
Lead 22/30B: Fulmar Formation
Lead 22/30C: Pentland Formation
Lead 22/30D: Skagerrak Formation
Trap
Area
Estimated Reserves
Estimated Reserves ctd.
Stacked hanging wall
closures of the Fulmar
Formation, Pentland
Formation and Skagerrak
Formation flanking salt
diapir cored horst.
Central North
Sea
Lead 22/30B:
In Place: 89 - 121 - 147 bcf
Recoverable: 18 - 25 - 34 bcf
Deterministic: 33 bcf
Lead 22/30C:
In Place: 185 - 251 - 305 bcf
Recoverable: 36 - 50 - 63 bcf
Lead 22/30D:
In Place: 91 - 126 - 161 bcf
Recoverable: 18 - 25 - 33 bcf
22/30B,C,D
Block: 22/30d
Horizon: Depth to top Fulmar Formation (ft)
Contour interval = 250 ft
Mapped on 3D
(see 1:100k maps top Pentland Fm. for Lead 22/30C, top Triassic for Lead 22/30D)
Stratigraphic
Column
0 metres
12
22/30a-16
discovery
18
0
18500
19000
Km
0
16000
1
2
50
1
182
170
22/30e Shell
0
0
1675
1700
SHEARWATER
19
0
50
0
1800
18000
f
eo B
Lin tion
c
se
50
177
00
0
00
Lead
22/30B
22/30d
NW
Eocene to
Recent
22/30b
Shell
Geological Cross Section
Depth
(km)
4.0
4.5
11000
Depth
(ft)
13000
Lead 22/30B
Late Cretaceous
to early Paleocene
(Chalk Group)
Lead 22/30C
Lead 22/30D
14000
Early Cretaceous
(Cromer Knoll Group)
Late Jurassic
(Humber Group)
Late Jurassic
(Fulmar Fm.)
5000
2000
3000
10000
MORAY GP./
MONTROSE GP.
4000
CROMER KNOLL GP
(E CRETACEOUS)
10000
Paleocene
3.5
SE
0 feet
Sea Bed
300 ft
1000
JUR.
17
16
23/26c Reach 28th Round potential award
00
TRIASSIC
16
50
0
0
EOCENE - QUATERNARY
00
PAL’CENE
5
19
Depth TVDSS
1-3
LATE CRETACEOUS
SCOTER
STRONSAY GROUP to NORDLAND GROUP
HERON
CHALK GROUP
14
22/30a Shell
Fulmar Formation absent or
subcrops the Cretaceous
HERON
GROUP
6
Depth TVDSS
Leads:
HUMBER GROUP
FULMAR FM.
FLADEN GROUP
(Pentland Fm.)
Skagerrak Fm.
16000
6000
17000
Middle Jurassic (Pentland Formation)
5.5
Triassic
(Heron Group)
Late Permian
(Zechstein Group)
1km
18000
19000
20000
Promote UK 2015
Contour interval = 250 feet
4
22/29a
Shell
5
3
22/25c
22/30f
Shell
22/25a Maersk
22/25b
7
MERGANSER
H
9
2
17
14 2
HERON
6
1
Fulmar Formation absent or
subcrops the Cretaceous
SCOTER
00
12
16
50
0
0
18
00
0
of A 22/30a-16
e
n
discovery
Linctio
e
s
17
00
16
18500
170
0
1800
6
18000
f
eo B
Lin tion
c
se
50
177
00
0
Lead
22/30B
19000
16000
182
50
1
0
00
22/30e Shell
1675
0
0
1700
19
50
0
22/
29d
23/26c Reach 28th Round potential award
22/29c Talisman
1-3
5
19
16
57°30'N
22/30a Shell
18000
17
A
3
4
15
23/26b Chevron
22/30c Elf
0
75
SHEARWATER
22/30d
11
1
G
ELGIN
22/30b Shell
29/5b Elf
GLENELG
0°48'E
0
1
2
3
4
57°20'N
29/5d Total
Kilometres
5
1°E
Depth in feet to the top of the Fulmar Formation showing the extent at this level of the
22/30a-16 discovery and Lead 22/30B
Promote UK 2015
Contour interval = 250 feet
4
22/29a
Shell
5
3
22/25c
22/30f
Shell
22/25a Maersk
22/25b
7
57°30'N
22/30a Shell
MERGANSER
H
9
2
17
14 2
HERON
6
1
Top Pentland Formation
subcrops the Cretaceous
1-3
SCOTER
162
19
12
5
00
18
25
0
18
18750
0
00
17
0
0
00
0
6
1925
1775
Lead
22/30C
16
0
0
f
eo B
Lin tion
c
se
18250
00
00
0
22/30e Shell
0
50
1700
2000
16
16000
187
50
0
1
170
00
17000
22/
29d
23/26c Reach 28th Round potential award
18
18
1
7
00
0
22/29c Talisman
0
75
50
16
0
185
7
17
00
19000
SHEARWATER
22/30d
A
22/30c Elf
3
4
15
23/26b Chevron
50
11
1
G
ELGIN
22/30b Shell
57°20'N
29/5b Elf 29/5d Total
GLENELG
0°48'E
0
1
2
3
4
Kilometres
5
1°E
Depth in feet to the top of the Pentland Formation showing the extent at this level of
Lead 22/30C
Promote UK 2015
Contour interval = 250 feet
4
22/29a
Shell
5
3
22/25c
22/30f
Shell
22/25a Maersk
22/25b
7
MERGANSER
H
9
2
17
14 2
HERON
6
1
SCOTER
1-3
12
16
0
2000
0
17
75
00
16
0
0
Lead
22/30A
21
0
17
50
00
19
00
0
18
0
0
00
00
1
00
180
18
75
22
20000
202
50
0
50
00
SHEARWATER
22/30d
A
22/30c Elf
3
4
0
20
15
23/26b Chevron
18
22/
29d
0
50
22/30e Shell
0
20
22/29c Talisman
0
of A
e
n
Linctio
se
20500
00
5
23/26c Reach 28th Round potential award
18750
17750
0
50
f
eo B
Lin tion
c
se
19
Lead
22/30D
19
6
57°30'N
22/30a Shell
11
1
G
ELGIN
22/30b Shell
57°20'N
29/5b Elf 29/5d Total
GLENELG
0°48'E
0
1
2
3
4
Kilometres
5
1°E
Depth in feet to the top of the Triassic showing the extent at this level of Leads 22/30A
and 22/30D
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NE
22/30a-16
SW 3.5
Base Chalk
Group
Base
Cretaceous
Top
Fulmar Fm
TWT
(s)
Top
Pentland Fm
4.0
Top
Triassic
4.5
22/30a-16 discovery
Lead 22/30A
1 km
MegaSurveyPlus seismic data courtesy of PGS
5.0
Seismic profile A across the 22/30a-16 (Commander) discovery and Lead 22/30A.
The 22/30a-16 discovery was made in the Upper Jurassic Fulmar Formation, and
the target reservoir for Lead 22/30A is sandstone within the Triassic Skagerrak
Formation.
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NW
SE 3.0
Top Sele
Formation
TWT
(s)
Lead 22/30B
Top Chalk
Group
Lead 22/30C
Lead 22/30D
3.5
Base Chalk
Group
Top
Pentland Fm
Base
Cretaceous
Top
Fulmar Fm
Triassic
undivided
4.0
Top Ur. Permian
Zechstein Group
Top
Triassic
1 km
MegaSurveyPlus seismic data courtesy of PGS
4.5
Seismic profile B across Leads 22/30B, 22/30C and 22/30D. The target reservoir for
Lead 22/30B is the Upper Jurassic Fulmar Formation; the target reservoir for Lead
22/30C is sandstone within the Middle Jurassic Pentland Formation, and the target
reservoir for Lead 22/30D is sandstone within the Triassic Skagerrak Formation.
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3.0
Depth
(km)
3.5
22/30a-16
NE
SW
10000
Eocene to Recent
Paleocene
Depth
(ft)
12000
Late Cretaceous
to early Paleocene
(Chalk Group)
4.0
13000
14000
4.5
15000
Early Cretaceous
(Cromer Knoll Group)
5.0
5.5
16000
17000
Late Jurassic )
(Humber Group
22/30a-16
6.0
Late Jurassic
(Fulmar Fm.)
Middle Jurassic
(Pentland Formation)
Lead 22/30A
Triassic
(Heron Group)
19000
20000
1km
6.5
Depth section A across the 22/30a-16 discovery and Lead 22/30A based on
seismic profile A
Trap: Stacked footwall closures of the oil and gas bearing Upper Jurassic Fulmar
Formation and the untested Triassic Heron Group.
Reservoir: The Upper Jurassic Fulmar Formation is 121 feet thick in discovery well
22/30a-16 (net:gross 0.77), and porosity of its sandstones ranges between 19.7
and 22.6%. The oil-bearing Triassic section in Heron Field well 22/30a-2, 9 km
to the north-west, has a net:gross of 0.79 with average 20.5% porosity.
Source: The Upper Jurassic Kimmeridge Clay Formation is undoubtedly the source
rock interval for the hydrocarbon column discovered in well 22/30a-16.
Seal: Overlying mudstones of the Humber Group provide the topseal for the 22/30a16 discovery. Since the Middle Jurassic Pentland Formation overlying Lead
22/30A may have a relatively high net:gross, exploration success in the Triassic
strata is likely to require an effective intraformational seal, either towards the
base of the Pentland Formation or within the Triassic section.
Risk: Topseal is a significant risk for Lead 22/30A.
18000
21000
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2.5
Depth
(km)
3.0
NW
SE
Eocene to Recent
9000
10000
Paleocene
Depth
(ft)
3.5
4.0
4.5
Lead 22/30B
Late Cretaceous
to early Paleocene
(Chalk Group)
12000
Lead 22/30C
13000
Lead 22/30D
14000
Early Cretaceous
(Cromer Knoll Group)
Late Jurassic
(Humber Group)
Late Jurassic
(Fulmar Fm.)
15000
Triassic
(Heron Group)
16000
5.0
Middle Jurassic (Pentland Formation)
5.5
Triassic
(Heron Group)
17000
Late Permian
(Zechstein Group)
18000
1km
19000
6.0
Depth section B across Leads 22/30B, 22/30C and 22/30D based on seismic profile B
Trap: Hanging wall stacked closures of the Upper Jurassic Fulmar Formation, Middle
Jurassic Pentland Formation and Triassic Heron Group flanking a salt diapircored horst to the south-east.
Reservoir: Upper Jurassic sandstones of the Fulmar Formation form the reservoir for
the 22/30a-16 discovery 6 km to the north-east, where 90 feet net sandstone
has an average sidewall core porosity of 17.4% and average permeability of 4.9
mD. In Heron Field well 22/30a-6, 5.5 km to the north, porosity in Pentland
Formation sandstones ranges mostly between 14 and 19%. The oil-bearing
Triassic section in Heron Field well 22/30a-2 has a net:gross of 0.79 with
average 20.5% porosity.
Source: The Upper Jurassic Kimmeridge Clay Formation is the source rock interval
for the many gas, oil and condensate fields in adjacent blocks.
Seal: An effective topseal is provided by overlying mudstones of the Upper Jurassic
Humber Group. However, there is a significant risk for seal breach along the
boundary fault to the south-east.
Risk: Seal breach at their boundary fault is the only significant exploration risk for all
three stacked leads.
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22/30a-16
0
Gamma
150
140
Sonic
40
Heather
Formation
Sandstone
Claystone & Siltstone
Limestone
17900
Fulmar
Formation
Coal
UPPER JURASSIC
Depths are in feet below KB
18000
Core 1
MIDDLE JURASSIC
18100
Pentland
Formation
Well log across the Fulmar Formation reservoir in discovery well
22/30a-16. This is also the target reservoir for Lead 22/30B.
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22/30a-6
Gamma
150
U. JURASSIC
0
Sonic
140
Heather
Formation
40
Fulmar
Formation
Core 1
Pentland
Formation
Sandstone
Claystone & Siltstone
Core 2
Coal
Core 3
Depths are in feet below KB
Core 4
Pentland Formation
Core 5
15200
MIDDLE JURASSIC
Average porosity: 15.3% (maximum 23.8%)
15400
TRIASSIC
Core 6
Skagerrak
Formation
Well log across the Middle Jurassic Pentland Formation in Heron Field well
22/30a-6. This is the target reservoir interval for Lead 22/30B.
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22/30a-2
Gamma
M. JUR.
0
150
140
Sonic
40
Pentland
Formation
14400
Skagerrak
Formation
Core 1
Sandstone
Claystone & Siltstone
14600
Coal
Depths are in feet below KB
14800
Joanne
Sandstone
Member
DST 1: flowed 14,000 bopd on a
48/64"choke
TRIASSIC
Skagerrak Formation
(above 15,240 feet)
Net pay: 400 feet (net:gross 0.79)
Average porosity: 20.5%
Hydrocarbon saturation: 56%
15000
DST
1
(15,240 - 15,382 feet)
Net pay: 97 feet (net:gross 0.68)
Average porosity: 17.4%
Hydrocarbon saturation: 18.7%
15200
15400
Well log across the upper part of the Skagerrak Formation interval in Heron
field discovery well 22/30a-2. This is the target reservoir interval for Leads
22/30A and 22/30D.