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Near-surface destruction (view source)
Revision as of 15:18, 22 January 2014
, 15:18, 22 January 2014→Geochemical signatures of biodegradation
* Inoculation of the reservoir by a microbial community that can degrade the oil
* Inoculation of the reservoir by a microbial community that can degrade the oil
* Temperature below approximately [[temperature::170°F]]<ref name=ch11r34>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p.</ref>
* Temperature below approximately [[temperature::170°F]]<ref name=ch11r34>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p.</ref>
[[file:predicting-preservation-and-destruction-of-accumulations_fig11-4.png|thumb|{{figure number|1}}See text for explanation.]]
==Geochemical signatures of biodegradation==
==Geochemical signatures of biodegradation==
The geochemical signatures of biodegradation are very distinctive. Shown below are whole-oil gas chromatographs of a heavily biodegraded oil (A) and its undegraded precursor (B) on an example from offshore Louisiana. Normal paraffins (sharp peaks in B) have been removed by bacterial action.
The geochemical signatures of biodegradation are very distinctive. [[:file:predicting-preservation-and-destruction-of-accumulations_fig11-4.png|Figure 1]] shows whole-oil gas chromatographs of a heavily biodegraded oil (A) and its undegraded precursor (B) on an example from offshore Louisiana. Normal paraffins (sharp peaks in B) have been removed by bacterial action.
==Predicting and recognizing biodegradation==
==Predicting and recognizing biodegradation==