Unravelling the nature of deep-marine sandstones through the linkage of seismic geomorphologies to sedimentary facies; the Hermod Fan, Norwegian North Sea - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 660

25/6 - 3

N S

1940

1960
1980
2000
2020
2040

C3

25/6 - 3

2060
2080
2100

2120
2140

0 5 km

N

0 250 m

UHN98 R00 Inline 4649

N 25/6 - 3 S

1940

Sele Fm

1960
1980
2000
2020
2040
2060
2080
2100
2120
2140

Base upper sst.
Top lower sst.

'Channel reflector'

Base lower sst.

0 250m

25/6 - 3

1960

1980

GR

46m core

2000

2020

2040

2060

2080

0 250m

Fig. 10. above: Interpreted and un-interpreted seismic section through well 25/6-3. The interpretations are based on the
well tie shown in Fig. 9. The reflector labelled 'channel reflector' corresponds to a sinuous channel shape in the RGB blend
(see Fig. 9C). Note that the seismic reflectors interpreted in cross-section form an 'eye shape' across the Hermod Member
in well 25/6-3. The interpreted difference in thickness between this 'eye' and the surrounding area is 30 ms to 40 ms two
way time (twt). Each of the two 30 m thick sandstones encountered by the well represents < 25 ms twt, suggesting that the
'eye shape' is set up by the combined effect of both sandstones. Below: Seismic wiggle display focused on the Hermod
Member. The gamma ray log (GR) and the cored interval in well 25/6-3 are indicated. The 'eye shape' is interpreted as a
channel complex with two 30 m thick sandstones. The base of the youngest 30 m thick sandstone ties (Fig. 9B) to a concave
upward reflector. The channel complex is interpreted to have formed in the fan growth phase and the overlying more tabu-
lar unit is interpreted as deposits related to the fan retreat phase.