Advertisement

Palynostratigraphical principles as applied in the Jurassic of the Troll and Draugen Fields, offshore Norway

  • C. J. van der Zwan
Conference paper

Abstract

While palynostratigraphy has been applied to all Norske Shell’s exploration wells since the early 1960s, the discovery of the Troll and Draugen fields led to a new phase in palynological applications, with palynology being extensively used in the determination of the reservoir units. Examples of such applications illustrate the following: (1) in the Upper Jurassic Sognefjord Formation in the Troll Field, how integration of palynostratigraphy with event stratigraphy based on blade-shaped opaque palynodebris and on lignite has helped to solve correlation problems; (2) in the Upper Jurassic of both the Troll and Draugen fields, how problems related to reworking have been avoided by preferentially using base occurrences of taxa, even though the relative abundance of the reworked assemblage would initially suggest otherwise; (3) in the Upper Jurassic of the Draugen Field, how palynofacies has helped to determine various sub-environments in the offshore bar sands of the Rogn Formation. The preferential use of base-occurrences in zonation is both theoretically and practically a better approach to biostratigraphic correlation.

Keywords

Seismic Stratigraphy Palynological Assemblage Reservoir Unit Biostratigraphic Correlation Event Stratigraphy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Brekke, T., Pegrum, R. M. and Watts, P. B. 1981. First exploration results in Block 31/2. In: Norwegian Symposium on Exploration, Norwegian Petroleum Society, Article 16.Google Scholar
  2. Birtles, R. 1986. The seismic flatspot and the discovery and delineation of the Troll Field. In: Spencer, A. M. et al. (eds), Habitat of Hydrocarbons on the Norwegian Continental Shelf, Norwegian Petrol. Soc., Graham & Trotman, London, 207–215.Google Scholar
  3. Davey, R. J. 1982. Dinocyst stratigraphy of the latest Jurassic to Early Cretaceous of the Haldager No. 1 borehole, Denmark. Danmarks Geol. Unders., Ser. B, (6), 1–56.Google Scholar
  4. Davey, R. J. and Riley, L. A. 1978. Late and Middle Jurassic dinoflagellate cysts. IKU Publ. 100, 31–44.Google Scholar
  5. Dunbar, C. O. and Rodgers, J. 1957. Principles of Stratigraphy, John Wiley, New York, 356 pp.Google Scholar
  6. Ellenor, D. W and Mozetic, A. 1986. The Draugen oil discovery. In: Spencer, A. M. et al. (eds), Habitat of Hydrocarbons on the Norwegian Continental Shelf, Norwegian Petrol. Soc., (Graham & Trotman, London, 313–316.Google Scholar
  7. Goesten, M. J. B. G. and Nelson, P. H. (in press). Draugen Field, Haltenbanken Area, offshore Norway. Contribution to: AAPG Field Atlas.Google Scholar
  8. Gray, D. I. 1987. Troll. In: Geology of Norwegian Oil and Gas Fields, Norwegian Petrol. Soc. Graham & Trotman, London, 389–401.Google Scholar
  9. Haq, B. U., Hardenbol, J. and Vail, P. R. 1987. Chronology of fluctuating sea levels since the Triassic. Science, 235, 1156–1166.CrossRefGoogle Scholar
  10. Hellem, T., Kjemperud, A. and Øvrebø, O. K. 1986. The Troll Field: a geological/geophysical model established by the PL 085 Group. In: Spencer, A. M. et al. (eds), Habitat of Hydrocarbons on the Norwegian Continental Shelf, Norwegian Petrol. Soc. Graham & Trotman, London, 217–238.Google Scholar
  11. Reinholdtsen, B. 1984. Improved recovery from thin oil sands. Part 2—Troll Field. In: Offshore Northern Seas—Improved Offshore Recovery, Norwegian Petroleum Society, Article R2.Google Scholar
  12. Riding, J. B. 1987. Dinoflagellate cyst stratigraphy of the Nettleton Bottom Borehole (Jurassic: Hettangian to Kimmeridgian), Lincolnshire, England. Proc. Yorks. Geol. Soc., 46(3), 231–266.CrossRefGoogle Scholar
  13. Riley, L. A. and Fenton, J. P. G. 1982. A dinocyst zonation for the Callovian to Middle Oxfordian succession (Jurassic) of northwest Europe. Palynology, 6, 193–202.CrossRefGoogle Scholar
  14. Rønnevik, H. and Johnsen, S. 1984. Geology of the Greater Troll Field area. Oil Gas J., 82(4), 100–106.Google Scholar
  15. Vail, P. R., Mitchum Jr., R. M. and Thompson III, S. 1977. Seismic stratigraphy and global changes of sealevel, Part 3: Relative changes of sealevel from coastal onlap. AAPG Mem., 26, 63–82.Google Scholar
  16. Vollset, J. and Doré, A. G. (eds) 1984. A revised Triassic and Jurassic Lithostratigraphic nomenclature for the Norwegian North Sea. Norweg. Petrolm Direct. Bull. 3, 55 pp.Google Scholar
  17. Whitaker, M. F. 1984. The usage of palynostratigraphy and palynofacies in definition of Troll Field geology. In: Offshore Northern Seas—Reduction of Uncertainties by Innovativev Reservoir Geomodelling, Norwegian Petroleum Society, Article G6.Google Scholar
  18. Woollam, R. and Riding, J. B. 1983. Dinoflagellate cyst zonation of the English Jurassic. Inst. Geol. Sci. Rep., 83/2, 1–41.Google Scholar

Copyright information

© Norwegian Petroleum Society 1989

Authors and Affiliations

  • C. J. van der Zwan
    • 1
  1. 1.A/S Norske ShellRisavikaNorway

Personalised recommendations