Changes

[[file:oiloil-and-oilsource-rock-correlations_fig8-42.png|300px|thumb|{{figure number|3}}m/z 191 mass chromatograms of two genetically related oils from Papua New Guinea.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-42.png|300px|thumb|{{figure number|3}}m/z 191 mass chromatograms of two genetically related oils from Papua New Guinea.]]

[[:file:oiloil-and-oilsource-rock-correlations_fig8-42.png|Figure 3]], which shows m/z 191 mass chromatograms of two genetically related oils from Papua New Guinea, gives another example of a major difference in hopane distribution. This difference could erroneously be considered genetic but is actually an unusual result of severe [[biodegradation]]. The top oil, recovered from a drill-stem test and not biodegraded, contains a full suite of triterpanes. The bottom seep oil, in contrast, is heavily biodegraded (gravity 30 hopane and homohopanes. The C₂₉ hopane is either unaffected or only slightly reduced in concentration. T_m, T_s, moretanes, and C_z (indicated with *) also appear unaffected at this level of biodegradation.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-42.png|Figure 3]], which shows m/z 191 mass chromatograms of two genetically related oils from Papua New Guinea, gives another example of a major difference in hopane distribution. This difference could erroneously be considered genetic but is actually an unusual result of severe [[biodegradation]]. The top oil, recovered from a drill-stem test and not biodegraded, contains a full suite of triterpanes. The bottom seep oil, in contrast, is heavily biodegraded ([[gravity]] 30 hopane and homohopanes. The C₂₉ hopane is either unaffected or only slightly reduced in concentration. T_m, T_s, moretanes, and C_z (indicated with *) also appear unaffected at this level of biodegradation.

==Internal standards==

==Internal standards==