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Geological Society, London, Special Publications; 1995; v. 86; p. 159-183;
DOI: 10.1144/GSL.SP.1995.086.01.12
© 1995 Geological Society of London

Case Studies

Migration of hydrocarbons in the Tampen Spur area, Norwegian North Sea: a reservoir geochemical evaluation

I. Horstad1, S. R. Larter2 & N. Mills1

1 Saga Petroleum as, Kjørbovn. 16, PO Box 490, N-1301 Sandvika, Norway
2 Newcastle Research Group in Fossil Fuels & Environmental Geochemistry (NRG), Drummond Building, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK

This paper describes the application of reservoir geochemical protocols to a study of oil-field and regional petroleum compositional variations in the major fields in the Tampen Spur area. The Tampen Spur high is located in the middle of several oil-mature to gas-mature source-rock kitchens and most of the structures might receive petroleum from several different directions. Based on the definition of several different petroleum populations within the Tampen Spur area, we define five major petroleum charging systems. Correlating the petroleum population variations with geological information allows us to derive likely migration/fill scenarios for many of the oil-fields and requires us to invoke a new Upper Jurassic carrier system in parts of the area connecting Brent Group reservoirs across major faults. Based on this hypothesis, two exploration wells were drilled on structures to test this carrier and petroleum was found in one of the structures. An understanding of the migration pathways and petroleum drainage efficiency of the basins is of great economic interest, because most of the smaller substructures are marginally economic. Thus, it is important to provide an effective risk analysis and ranking of the satellite prospects prior to drilling. This study has demonstrated that filling and migration in a geological province are controlled by a series of complex processes and that the filling history of the structures within the Tampen Spur is more complicated than suggested earlier.





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