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Line 25: − Examination of correlation parameters that are more specifically source distinctive, however, suggests that the variations within the set of oils are actually minor. The distribution of C<sub>27</sub>-C<sub>29</sub> regular steranes shows that most of the oils cluster rather tightly, with approximately equal concentrations of each homolog (top figure, below). Furthermore, Hughes et al.<ref name=ch08r20 />) report that δ<sup>13</sup>C values for the oils range from –28.7 ‰ to –26.8 ‰, with 28 of the 30 oils falling in the –28.3 ‰ to –27.1 ‰ range. Finally, terpane distributions show that many of the oils are very similar to one another (bottom figure, below). − The ternary diagram (top) shows the distribution of ααα-20R-steranes by carbon number. The oval encloses all of the samples. The small range for most of the samples within the oval suggests that a single organic source facies could be responsible for most of the oils. In the m/z 191 mass chromatograms (bottom) for a typical Ekofisk and Eldfisk oil, note the peak-to-peak similarity of these oils of similar maturity.+ − + + +
Oil correlation case history: Norwegian sector, North Sea (view source)
Revision as of 21:29, 13 February 2014
, 21:29, 13 February 2014→Further evidence shows oils are similar
==Further evidence shows oils are similar==
==Further evidence shows oils are similar==
[[file:oiloil-and-oilsource-rock-correlations_fig8-47.png|thumb|{{figure number|2}}From Hughes et al.<ref name=ch08r20 />); reprinted with permission from Norwegian Geological Society.]]
[[file:oiloil-and-oilsource-rock-correlations_fig8-47.png|thumb|{{figure number|8-47}}From Hughes et al.<ref name=ch08r20 />); reprinted with permission from Norwegian Geological Society.]]
Examination of correlation parameters that are more specifically source distinctive, however, suggests that the variations within the set of oils are actually minor. The distribution of C<sub>27</sub>-C<sub>29</sub> regular steranes shows that most of the oils cluster rather tightly, with approximately equal concentrations of each homolog ([[:file:oiloil-and-oilsource-rock-correlations_fig8-47.png|Figure 2]]). Furthermore, Hughes et al.<ref name=ch08r20 />) report that δ<sup>13</sup>C values for the oils range from –28.7 ‰ to –26.8 ‰, with 28 of the 30 oils falling in the –28.3 ‰ to –27.1 ‰ range. Finally, terpane distributions show that many of the oils are very similar to one another ([[:file:oiloil-and-oilsource-rock-correlations_fig8-47.png|Figure 2]], bottom).
The ternary diagram ([[:file:oiloil-and-oilsource-rock-correlations_fig8-47.png|Figure 2]], top) shows the distribution of ααα-20R-steranes by carbon number. The oval encloses all of the samples. The small range for most of the samples within the oval suggests that a single organic source facies could be responsible for most of the oils. In the m/z 191 mass chromatograms ([[:file:oiloil-and-oilsource-rock-correlations_fig8-47.png|Figure 2]], bottom) for a typical Ekofisk and Eldfisk oil, note the peak-to-peak similarity of these oils of similar maturity.
==Conclusions drawn from the correlation study==
==Conclusions drawn from the correlation study==