Gapeflyndre Member [new]
Shetland Group,
Blålange Formation
Name
Derivatio nominis: Norwegian for the American plaice or sole,
Hippoglossoides
platessoides. Appropriately, this fish is found on soft bottoms,
most often in water
depths of 90-250m in the North Atlantic region including the Norwegian Sea.
Informal name: Lange sandstones.
Lithology
Interbedded sandstones, siltstones and mudstones. The sandstones
frequently contain glauconite or kaolinite. Not cored in the type well.
Upper and lower boundaries
Lower boundary
The lower boundary of the Gapeflyndre Member is characterised by negative
separation between density and neutron porosity logs defining the
development of sandstones above a predominantly mudstone interval and is
well defined on both gamma ray and sonic logs.
Upper boundary
The upper boundary is more difficult to define due to the progressive
decrease in the frequency of sandstone interbeds.
Thickness
The gross thickness of the member is 221.5 m in the type well.
Interactive Norlex isochore map for the Gapeflyndre Member (type well only).
Geographical distribution
This member is attributed to the Blålange Formation (Shetland
Group) and found in the Slørebotn Sub-basin, on the eastern Møre margin.
Occurrences of member tops in
wells
Type well
Well name: 6305/12-1
WGS84 coordinates: N 63°1'25.73", E 05°47'23.94"
UTM coordinates: 6991476.94 N 641178.97 E
UTM zone: 31
Drilling operator name: Norsk Hydro Produksjon AS
Completion date: 18.09.1991
Status: P & A
Interval of type section (m) & thickness in type well:
3451.5 m - 3230 m, 221.5 m thickness.
Reference wells
None designated.
Well log characteristics
The member shows an irregular and serrate GR log profile and a series of cleaning-upward
profiles that probably represent repeated sandstone input.
Age
Late Cretaceous, Cenomanian.
Depositional environment
Deep marine.
Core is lacking but based on log character and location within the Slørebotn sub-basin,
the member is considered to be a series of interbedded basin mudstones/mud-dominated
turbidites (facies BM1) and lobe fringe or interlobe overbank turbidite sandstones
(facies BT3).
Remarks
A possible 'Blodøks Formation Equivalent' was noted by the Operator in the type well
6305/12-1 above this member between 3140m-3158mMD. An equivalent of the Gapeflyndre
Member is recognized in the
6205/3-1 R well
(2925m-2973m). This is located in a more
basinal position and dominated by siltstones.
References
No previous published sources. Data from the Operator final well report and the NPD fact
pages.
