Changes

==Hopanes==

==Hopanes==

[[file:oiloil-and-oilsource-rock-correlations_fig8-26.png|thumb|{{figure number|8-26}}See text for explanation.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-26.png|thumb|{{figure number|4}}See text for explanation.]]

 

Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C₃₁ to C₃₅ is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D., W., Machihara, T., 1991, Biomarkers for geologists: Tulsa, AAPG, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K., E., Moldowan, J., M., 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref>

Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C₃₁ to C₃₅ is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D., W., Machihara, T., 1991, Biomarkers for geologists: Tulsa, AAPG, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K., E., Moldowan, J., M., 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref>

The figure shows the m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-26.png|Figure 4]] shows the m/z 191 mass fragmentogram of an oil displaying the most common type of homohopane distribution.

 

==Irregular homohopanes==

==Irregular homohopanes==

[[file:oiloil-and-oilsource-rock-correlations_fig8-27.png|thumb|{{figure number|8-27}}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|{{figure number|8-27}}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.]]