NJG80-2-05
2000
Sequence stratigraphy of the inner Finnmark carbonate platform (Upper Carboniferous-Permian), Barents Sea- correlation between well 7128/6-1 and the shallow IKU cores
80
2
pp. 129--162

A new set of descriptions has been prepared for five of the IKU cores, a series of shallow stratigraphic cores penetrating the Upper Carboniferous-Permian Finnmark carbonate platform succession near its southern erosional truncation against the Norwegian mainland. These data are compared with core descriptions previously published from the thicker 'stratigraphic reference section' of the exploration well 7128/6- 1 (Ehrenberg et al. 1 998a). New fusulinid datings from 7 128/6- 1 are correlated with existing fusulinid data from the IKU cores to provide a consistent time-stratigraphic framework for landward correlation of depositional sequences previously defined in the 7 128/6-1 reference section. These correlations reveal a limited two-dimensional image of depositional sequence geometry for the ioner platform. Of the 7 major sequences previously defined in the Kasimovian through Upper Permian section of well 7 128/6- 1, 2 sequences are suggested to pinch out before reaching the IKU cores, while the remaining 5 sequences thin by 32-33% and show landward loss of lithologic resolution of systems tracts. Thinning is probably accomplished by increasing magnitude and frequency of hiatuses both within and bounding each sequence, reftecting gradual uplift of the Norwegian mainland and seaward tilting of the platform throughout the depositional history. Landward changes in lithology, dolomitization, and porosity are relatively subtle, suggesting that platform deposition extended well beyond the present southern termination of carbonate strata.

S. N. Ehrenberg, Statoil, N-4035 Stavanger, Norway (e-mail. This email address is being protected from spambots. You need JavaScript enabled to view it.);
N. A. H. Pickard, Cambridge Carbonates Ltd., Clematis Cottage, 41 Linthurst Newtown, Blackwell, Bromsgrove, Worcestershire, B60 1BP, UK (e-mail. This email address is being protected from spambots. You need JavaScript enabled to view it.);
T. A. Svånå, Statoil, postboks 40, N-9481 Harstad, Norway (e-mail. This email address is being protected from spambots. You need JavaScript enabled to view it.);
I. Nilsson, Saga Petroleum a.s., Pb. 490, N-1301, Sandvika, Norway (e-mail. This email address is being protected from spambots. You need JavaScript enabled to view it.);
V. Darydov, Permian Research Institute, Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, USA (e-mail. This email address is being protected from spambots. You need JavaScript enabled to view it.)

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0029-196X