Changes

==Irregular homohopanes==

==Irregular homohopanes==

[[file:oiloil-and-oilsource-rock-correlations_fig8-27.png|thumb|200px|{{figure number|5}}m/z 191 mass chromatograms for two sediment extracts from the Brac-1 well (Croatia) showing irregular homohopane distributions [relative enhancement of the C₃₅ species (left) and C₃₄ species. From Moldowan et al.;<ref name=ch08r33>Moldowan, J., M., Lee, C., Y., Sundararaman, P., Salvatori, T., Alajbeg, A., Gjukic, B., Demaison, G., J., Slougue, N.-E., Watt, D., S., 1992, Source correlation and maturity assessment of select oils and rocks from the central Adriatic Basin (Italy and Yugoslavia), in Moldowan, J., M., Albrecht, P., Philp, R., P., eds., Biological markers in sediments and petroleum: Englewood Cliffs, New Jersey, Prentice-Hall, 411 p.</ref> reprinted with permission from Prentice-Hall.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-27.png|thumb|left|200px|{{figure number|5}}m/z 191 mass chromatograms for two sediment extracts from the Brac-1 well (Croatia) showing irregular homohopane distributions [relative enhancement of the C₃₅ species (left) and C₃₄ species. From Moldowan et al.;<ref name=ch08r33>Moldowan, J., M., Lee, C., Y., Sundararaman, P., Salvatori, T., Alajbeg, A., Gjukic, B., Demaison, G., J., Slougue, N.-E., Watt, D., S., 1992, Source correlation and maturity assessment of select oils and rocks from the central Adriatic Basin (Italy and Yugoslavia), in Moldowan, J., M., Albrecht, P., Philp, R., P., eds., Biological markers in sediments and petroleum: Englewood Cliffs, New Jersey, Prentice-Hall, 411 p.</ref> reprinted with permission from Prentice-Hall.]]

Irregular distributions of the C₃₂–C₃₅ homohopanes are associated with carbonates<ref name=ch08r59 /> and/or more reducing conditions.<ref name=ch08r39 /> Unusually large amounts of the C₃₁ homohopanes are sometimes associated with coals and coaly material.<ref name=ch08r59 />

Irregular distributions of the C₃₂–C₃₅ homohopanes are associated with carbonates<ref name=ch08r59 /> and/or more reducing conditions.<ref name=ch08r39 /> Unusually large amounts of the C₃₁ homohopanes are sometimes associated with coals and coaly material.<ref name=ch08r59 />

[[:file:oiloil-and-oilsource-rock-correlations_fig8-27.png|Figure 5]] shows m/z 191 mass chromatograms for two sediment extracts from the Brac-1 well (Croatia) showing irregular homohopane distributions [relative enhancement of the C₃₅ species (left) and C₃₄ species (right). We would expect the oils sourced from these sediments to show these same characteristics.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-27.png|Figure 5]] shows m/z 191 mass chromatograms for two sediment extracts from the Brac-1 well (Croatia) showing irregular homohopane distributions [relative enhancement of the C₃₅ species (left) and C₃₄ species (right). We would expect the oils sourced from these sediments to show these same characteristics.

==Gammacerane==

==Gammacerane==