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 666

N

C

C4N

A B

C4S

0 2.5 km

A B C

I ʹ

II ʹ

I

II

I ʹ II ʹ I II

SW NE SW NE

Near Top Sele

50ms

250m

Fig. 13. The habitat of some small circular depressions. above: RGB-blend time slice draped with a semi-transparent Sele
Formation isochron map. Warm colours represent thick areas, cold colours represent thin areas. Channels C4N and C4S are
indicated for reference. Small circular depressions may align and form a trench adjacent to a ridge (a). The seismic cross
section illustrates the adjacent ridge, or elevated shoulder in 2d section, with arrow pointing at a break in the near top Sele
reflector where the injectite in Balder is thought to evolve from. Small circular depressions may also be distributed more
randomly and separated by more narrow ridges (B). Example (C) is a single isolated occurrence of a depression with a very
similar size and the same four characteristics described for the well 25/5-1 depression (Fig. 12). Below: seismic sections at
the top of the Sele Formation showing injectite occurrence at the edge of two depressions. The arrows point to breaks in
the near top Sele reflector, with possible injectites originating from the breaks.