Changes

[[file:oiloil-and-oilsource-rock-correlations_fig8-1.png|300px|thumb|{{figure number|1}}Application of cluster analysis in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. From Curiale;<ref name=ch08r8 /> reprinted with permission of the American Chemical Society.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-1.png|300px|thumb|{{figure number|1}}Application of cluster analysis in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. From Curiale;<ref name=ch08r8 /> reprinted with permission of the American Chemical Society.]]

[[:file:oiloil-and-oilsource-rock-correlations_fig8-1.png|Figure 1]] shows the application of cluster analysis in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. Although the concentrations of elements in an oil may vary due to alteration episodes (such as [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx biodegradation]), the relative distribution of these elements often remains constant and source distinctive. The concentrations of copper, iron, manganese, nickel, and vanadium in each oil were used to construct this cluster. The Bray-Curtis distance shows the degree of dissimilarity from oil to oil. Here eight oils of type A and three oils of type B are indicated. Other geochemical evidence supports this subdivision.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-1.png|Figure 1]] shows the application of [[Multivariate_data_analysis#Cluster_analysis|cluster analysis]] in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. Although the concentrations of elements in an oil may vary due to alteration episodes (such as [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx biodegradation]), the relative distribution of these elements often remains constant and source distinctive. The concentrations of copper, iron, manganese, nickel, and vanadium in each oil were used to construct this cluster. The Bray-Curtis distance shows the degree of dissimilarity from oil to oil. Here eight oils of type A and three oils of type B are indicated. Other geochemical evidence supports this subdivision.

==Integrate with geology and geochemistry==

==Integrate with geology and geochemistry==