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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Commercial oil reserves were discovered in the Norwegian sector of the North Sea more than twenty years ago. [[Oil–oil and oil–source rock correlation]]s are now reasonably well known and constrained for this region. Early efforts at correlating oils in this area were documented by Phillips Petroleum Co. workers<ref name=ch08r20>Hughes, W. B., A. G. Holba, D. E. Miller, and J. S. Richardson, 1985, Geochemistry of greater Ekofisk crude oils, in Thomas, B., M., eds., Petroleum geochemistry in exploration of the Norwegian Shelf: London, Graham & Trotman, p. 75–92.</ref> following examination of 30 oils from eight fields. In addition to performing conventional compound-fraction separations and [[Gas chromatography|GC]] and GC/MS analyses, those workers also examined sulfur compound distributions, sulfur and nitrogen contents, and [[Wikipedia:Isotope geochemistry|carbon isotope ratios]]. Their integrated study provides a good example of a modern oil–oil correlation.

Commercial oil reserves were discovered in the Norwegian sector of the [[North Sea]] more than twenty years ago. [[Oil–oil and oil–source rock correlation]]s are now reasonably well known and constrained for this region. Early efforts at correlating oils in this area were documented by Phillips Petroleum Co. workers<ref name=ch08r20>Hughes, W. B., A. G. Holba, D. E. Miller, and J. S. Richardson, 1985, Geochemistry of greater Ekofisk crude oils, in Thomas, B., M., eds., Petroleum geochemistry in exploration of the Norwegian Shelf: London, Graham & Trotman, p. 75–92.</ref> following examination of 30 oils from eight fields. In addition to performing conventional compound-fraction separations and [[Gas chromatography|GC]] and GC/MS analyses, those workers also examined sulfur compound distributions, sulfur and nitrogen contents, and [[Wikipedia:Isotope geochemistry|carbon isotope ratios]]. Their integrated study provides a good example of a modern oil–oil correlation.

==Initial evidence suggests several oil families==

==Initial evidence suggests several oil families==