Geoscience Reference
In-Depth Information
Prev.
zones
GR
New
zones
Facies
ass.
NPHI/
RHOB
PERM.
Key
surfaces
Interpretation
Thickness
mD
0.2
20000
2.13
MFS3
Åre 7. 2
Åre 7. 1
2.12
Tr ansgressive shallow marine
shoreface deposits
15-20 m
TRS
2.11
Tide-dominated facies interfingering
with minor sandy bay-fill deposits
Heterolithic bay-fill and tide-
influenced channels
Åre 6.2
10-25 m
c.SB3
2.10
Åre 6.1
10-15 m
FS3
2.9
Åre 5.3
Incising tide-influenced channels
and sandy bay-fill deposits
4-20 m
Åre 5.2
c.SB2
2.8
2.7
Mud-prone succession comprising
several stacked heterolithic bay-fill
deposits
Åre 5.1
20-40 m
2.6
2.5
2.4
2.3
2.2
2.1
1. 19
1. 18
FS2
Åre 4.4
Åre 4.3
Sand-rich succession comprising
well-organised, stacked
bay-fill cycles
50-75 m
Åre 4.2
Åre 4.1
1. 17
MFS2
Åre 3.3
Åre 3.2
1. 16
Mixed interval of coastal plain
and brackish bay-fill deposits
60-70 m
Åre 3.1
1. 15
1. 14
FS1
1. 13
Åre 2.2
Field-scale channel belt
8-34 m
c.SB1
1. 12
1. 11
1. 10
1. 9
65-80 m
Åre 2.1
1. 8
1. 7
Thick interval dominated by
coastal plain deposits comprising
fluvial channels, crevasse splay
deposits, floodplain muds and coals
MFS1
Coal Marker
1. 6
1. 5
Åre 1
< 300 m
1. 4-1.1
Fluvial channel
Floodplain and crevasse
splay deposits
Peat swamp
Bay-fill deposits
MFS = Maximum flooding surface
Tidal/tidally-influenced channel
FS = Flooding surface
Tidal flat deposits
TRS = Tr ansgressive ravinement surface
c.SB = Candidate sequence boundary
Tr ansgressive shoreface deposits
Fig. 4.
Reservoir zonation scheme of the Åre Formation, Heidrun Field, showing sedimentary characteristics and associated
wireline log signatures of each reservoir zone (based on well 6507/7-A-46). The previous reservoir zonation (left column)
was modified from Kjærefjord (1999) and Svela (2001). (GR, NPHI/RHOB, PERM. refer to gamma ray; neutron/density;
permeability, respectively).
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