STATFJORD GP
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.STATFJORD GPNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.157Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.GROUP -
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Beskrivelse
Statfjord Group
NameNamed by Deegan and Scull (1977).Well type sectionNorwegian well 33/12-2 (Mobil), from 2700 m to 2951 m, coord N 61°13'31.18", E 01°51'25.97" (Fig 3.6) .Well reference sectionsUK well 211/24-1 (Conoco) from 3112 m to 3434 m, coord N 61°11'46.2'', E 01°46'26.3" (Fig 3.7) . Norwegian wells 30/6-1 (Statoil), from 2712 m to 3003 m, coord N 60°33'15.10'', E 02°46'38.36" (Fig 3.8) . and 25/2-5 (Elf) from 3652 m to 3847 m, coord N 59°48'01.40", E 02°28'18.30" (Fig 3.9) .Thickness251 m in the type well, 322 m in UK well 211/24-1, 291 m and 195 m in Norwegian wells 30/6-1 and 25/2-5 respectively. The group is thinner on the crest of fault blocks and thicker on the downthrown side. It attains its fullest development in the central part of the Viking Graben. To the west, e.g. in the area of the Cormorant Field, only the upper formation is present and this is reduced to a sandstone only a few meters in thickness. To the east, toward the bounding fault zone of the Fennoscandian Shield, the group is reduced to tens of meters in thickness.LithologyThe group exhibits a transition from continental to shallow marine sediments. In the type well area it is a transitional "coarsening upward" sequence in the basal parts consisting of grey, green and sometimes red shale interbedded with thin siltstones, sandstones and dolomitic limestones. Above are massive white to grey sandstone bodies interbedded with greenish-grey to red-brown shales. The top part of the group consists of thick, white to grey, fossiliferous and glauconitic sandstones. On the Horda Platform, east of the Viking Graben, the group consists of massive, white, fine to coarse grained sandstones inter-bedded with light grey, and sometimes red, silty micaceous, lignitic shales. Towards the east the frequency of black, coaly shales and coal layers increases.BoundariesThe base of the Statfjord Group is very difficult to define, and different operators have established different boundaries. In the type well area the proposed boundary marks the base of the thin transitional unit (coarsening upward sequence), which marks the passage from the more shaly Lunde Formation of the Hegre Group to the massive sandstones of the Statfjord Group. It should be emphasized that this transition can only be clearly recognized in some wells in the area of the Brent and Statfjord fields. Towards the east, e.g. in the Viking Graben and the Horda Platform, the lower boundary is chosen at the base of the lowest massive sandstone unit before passing downwards into dominantly red brown shales. This boundary is often associated with a sonic log break. Lervik (2006) proposed to place the boundary between the Statfjord Group and the Hegre Group at the turning point of a fining upward mega-sequence of the Lunde Formation with the coarsening-upward sequence of the Statfjord Group which very often coincides with a sudden upward decrease of sonic log velocity. The top of the group is at the contact between the uppermost medium to coarse-grained calcareous sandstones and the dark shales and siltstones of the overlying Dunlin Group . It should be noted that the top part of the calcareous sandstones in the UK sector (e.g. in the Brent Field and in UK part of the Statfjord Field , passes laterally into calcareous shales and siltstones in the Norwegian sector. The group boundary, being a lithological one, however, is placed at the top of the sandstones, regardless of age.DistributionThe Statfjord Group can be recognized in the entire area between East Shetland Platform to the west and the bounding fault zone of the Fennoscandian Shield to the east. The group is identified in the Viking Graben as far south as Norwegian blocks 25/8 and 11, e.g. in wells 25/8-1 and 25/8-2 (Esso).AgeThe formation ranges in age from Rhaetian to Sinemurian.Depositional environmentThe lower transitional unit in the type well area appears to represent an upward passage from the dominantly continental deposits of the Lunde Formation of the Hegre Group to lower alluvial plain and braided stream deposits which make up most of the Statfjord Group (Kirk, 1979, Chauvin and Valachi, 1980). Towards the top of the group coarse sandstones with pebble beds, crossbedding and channel structures appear to have been deposited in a coastal environment. The uppermost sandstones are relatively structureless but the presence of marine fossils and glauconite suggests a shallow marine environment (Deegan and Scull, 1977).SubdivisionThe Statfjord Group is divided in the type well area ( Statfjord Field ) into three formations, the Raude Formation (base) the Eiriksson Formation and the Nansen Formation (top) (Deegan and Scull, 1977). It should be emphasized that this subdivision can only be applied west of the Viking Graben. Even within this area application of the subdivision is often difficult. No workable subdivision has been established in the few well penetrations of the Statfjord Group east of the Viking Graben. For definition and detailed description of the formations (former members) of the Statfjord Group, see Deegan and Scull (op. cit). Lervik (2006) proposed to elevate the Statfjord Formation to group level and the members Raude, Eiriksson and Nansen to formation level.Source-
Vollset, J. and Doré, A. G. (eds.) 1984: A revised Triassic and Jurassic lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 3, 53 pp.
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Lervik, K.-S. 2006: Triassic lithostratigraphy of the Northern North Sea Basin. Norwegian Journal of Geology, Vol. 86, pp. 93-116.
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Brønnbaner som penetrerer
Brønnbaner som penetrerer 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Brønnbaner med kjerner
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