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==Biodegradation limitations==
 
==Biodegradation limitations==
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[[file:oiloil-and-oilsource-rock-correlations_fig8-20.png|thumb|{{figure number|16}}From Curiale et al.;<ref name=ch08r12>Curiale, J., A., 1994, Correlation of oils and source rocks—a conceptual and historical perspective, in Magoon, L., B., Dow, W., G., eds., The [[Petroleum system]]—From Source to Trap: AAPG Memoir 60, p. 251–260.</ref> and Curiale<ref name=ch08r9>Curiale, J., A., 1991, The petroleum geochemistry of Canadian Beaufort Tertiary “non-marine” oils: Chemical Geology, vol. 93, p. 21–45., 10., 1016/0009-2541(91)90062-V</ref> reprinted with permission from Elsevier.]]
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[[file:oiloil-and-oilsource-rock-correlations_fig8-20.png|thumb|{{figure number|16}}From Curiale et al.;<ref name=ch08r12>Curiale, J., A., 1994, [http://archives.datapages.com/data/specpubs/methodo2/data/a077/a077/0001/0250/0251.htm Correlation of oils and source rocks—a conceptual and historical perspective], in Magoon, L., B., Dow, W., G., eds., The [[Petroleum system]]—From Source to Trap: [http://store.aapg.org/detail.aspx?id=1022 AAPG Memoir 60], p. 251–260.</ref> and Curiale<ref name=ch08r9>Curiale, J., A., 1991, The petroleum geochemistry of Canadian Beaufort Tertiary “non-marine” oils: Chemical Geology, vol. 93, p. 21–45., 10., 1016/0009-2541(91)90062-V</ref> reprinted with permission from Elsevier.]]
    
Biodegradation can severely alter gas chromatograms. In the earliest stages of biodegradation, ''n''-alkanes are removed selectively, leading to significant loss of information.
 
Biodegradation can severely alter gas chromatograms. In the earliest stages of biodegradation, ''n''-alkanes are removed selectively, leading to significant loss of information.

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