Lunde Formation

(See also NPD Bulletin no. 3 for previous definition)

Hegre Group


Named after the bird Puffin (Norwegian: lunde).

Well type section

Norwegian well 33/12-2 from 2951 m to 3749 m, coordinates N61°13'31.38", E01°51'25.97".

Well reference sections

UK well 211/29-5 from 3003 m to 3795 m, coordinates N 61°04'43.00", E01°45'46.5o".
NO well 34/4-C-6H from 2980 m to 3452 m, coordinates N 61°31'30.51", E02°12'40.66".
NO well 34/7-3 from 2635 m to 3365 m, coordinates N 61°25'54.05", E 02°07'43.95".


798 m in the type well and 792 m in the reference well.


The succession of the Lunde Formation is dominated by very fine to very coarse-grained sandstones, claystones, mudstones, shales and marls. The sandstones are mainly white while the fine grained lithologies are generally red, green and grey-green. This is contrasting to the pre- Alke Formation succession where all lithologies generally are red stained. Especially in the upper part of the succession the claystones and mudstones are non-stained.


The base of the Formation is picked at the transition from the fine grained lithology of the Alke Formation to the intercalated sandstones and mudstones/claystones of the Lunde Formation. This transition is marked by a distinct change in the sonic and gamma ray logs.


Distribution of the Lunde Formation (click image for full size). The distribution of the Lunde Formation of this figure is north of 60 degrees.


Late Triassic, Norian to Early Rhaetian.

Depositional environment

The Lunde Formation represents a major depositional fluvial system building out from the Fennoscandian Shield, or/and from the East Shetland Platform.


The base boundary of the Lunde Formation has been changed from its original definition. It was at the time of original definition discussed that the lower unit of the Formation should be erected and defined as a separate unit at a later stage (Vollset & Doré 1984). As the lower boundary has been changed, the Formation should have been abandoned and new name erected. Salvador (1994), states, however, that units which have been in extensive use, can keep its original name although the boundaries of the formation is changed. Nystuen (1989) states that minor changes in definition of boundaries may be desirable following new investigations. If such revision only alters a small portion of the original unit, its name can be retained. As the Lunde Formation is an important reservoir in the Snorre Field and has been extensive used, as well as it was already mentioned upon definition that the lower boundary of the Formation should be modified, it is here chosen not to abandon the Formation, but rather adjust the lower boundary. It is mainly the upper part of the Lunde Formation which has been dealt with as reservoir within the Snorre Field, and it will therefore only to a minor degree affect its use.

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