Changes

Peters et al.<ref name=ch08r41 /> approached both the oil–oil and oil–source rock correlation aspects together, relying upon molecular and isotopic data accompanied by cluster analysis results. The distributions of regular steranes and monoaromatic steroid hydrocarbons (C₂₇– C₂₉) provided an excellent framework for the correlation. The oils (shown as solid circles in the figure below) form two distinct families according to these criteria: 26 oils fall in a group relatively depleted in the C₂₉ homolog, while six oils form a group relatively enriched in C₂₉. This two-family oil–oil classification is also consistent with whole-oil carbon isotope ratios as well as with other biomarker data.

Peters et al.<ref name=ch08r41 /> approached both the oil–oil and oil–source rock correlation aspects together, relying upon molecular and isotopic data accompanied by cluster analysis results. The distributions of regular steranes and monoaromatic steroid hydrocarbons (C₂₇– C₂₉) provided an excellent framework for the correlation. The oils (shown as solid circles in the figure below) form two distinct families according to these criteria: 26 oils fall in a group relatively depleted in the C₂₉ homolog, while six oils form a group relatively enriched in C₂₉. This two-family oil–oil classification is also consistent with whole-oil carbon isotope ratios as well as with other biomarker data.

[[file:oiloil-and-oilsource-rock-correlations_fig8-54.png|thumb|300px|{{figure number|2}}distribution of the C₂₇–C₂₉ regular steranes (left) and monoaromatic steroid hydrocarbons (right) for oils in the West Siberian basin.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-54.png|thumb|300px|{{figure number|2}}distribution of the C₂₇–C₂₉ regular steranes (left) and monoaromatic steroid hydrocarbons (right) for oils in the West Siberian basin. From Peters et al. (1994); courtesy AAPG.]]

The ternary diagrams in [[:file:oiloil-and-oilsource-rock-correlations_fig8-54.png|Figure 2]] show the distribution of the C₂₇–C₂₉ regular steranes (left) and monoaromatic steroid hydrocarbons (right) for oils in the West Siberian basin. Two oil families can be distinguished on the basis of their relative amounts of the C₂₉ homologs. The bitumens from all the Bazhenov Formation rock samples plot together with a single oil family. Molecular structures are shown for the compounds used in the ternary diagrams.

The ternary diagrams in [[:file:oiloil-and-oilsource-rock-correlations_fig8-54.png|Figure 2]] show the distribution of the C₂₇–C₂₉ regular steranes (left) and monoaromatic steroid hydrocarbons (right) for oils in the West Siberian basin. Two oil families can be distinguished on the basis of their relative amounts of the C₂₉ homologs. The bitumens from all the Bazhenov Formation rock samples plot together with a single oil family. Molecular structures are shown for the compounds used in the ternary diagrams.