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NORLEX


Tare Formation (Tareformasjonen)

(From NPD Bulletin no. 4)

Rogaland Group

Name

From the Norwegian name for algae or sea tangle. The formation corresponds to the informal Alstahaug formation or H5-2.

Well type section

Well 6507/12-1 (Statoil), coordinates 65°07'01.62"N, 07°42'42.61"E, from 1884 m to 1826 m (Fig. 36). No cores.

Thickness

58 m in the type well.

Lithology

Dark grey, green or brown claystones with some thin sandstone stringers show a variable content of tuff.

Basal Stratotype

The base is defined by an increase in tuff content. Consequently the sonic log shows a decrease in interval transit time and an increase in density log readings.

Lateral extent and variation

The Tare Formation is ubiquitous except near the crest of the Nordland Ridge. The tuff content decreases southwards.

Occurrences of formation tops in wells
Isochore map TANG-TARE

Age

Late Paleocene.

Depositional environment

These sediments were deposited in a deep marine environment.

Correlation

The Tare Formation is similar in both age and lithology to the Balder Formation (Deegan & Scull, 1977) in the North Sea.

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