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Rock Eval analysis using hydrogen index (HI) and oxygen index (OI) (view source)
Revision as of 13:33, 4 September 2014
, 13:33, 4 September 2014→Oxygen index
The oxygen index (OI) represents the amount of oxygen relative to the amount of organic carbon present in a sample. The [[Rock-Eval_pyrolysis#Pyrolysis_indices|S3 curve]] of a Rock-Eval analysis can help us determine the total amount of oxygen present in a sample according to the following formula:
The oxygen index (OI) represents the amount of oxygen relative to the amount of organic carbon present in a sample. The [[Rock-Eval_pyrolysis#Pyrolysis_indices|S3 curve]] of a Rock-Eval analysis can help us determine the total amount of oxygen present in a sample according to the following formula:
[[file:evaluating-source-rocks_fig6-4.png|thumb|300px|{{figure number|1}}. Copyright: Tissot and Weite, 1984; courtesy Springer-Verlag.]]
[[file:evaluating-source-rocks_fig6-4.png|thumb|300px|{{figure number|1}}Modified Van Krevlen diagram. Copyright: Tissot and Welte;<ref>Tissot, B. P., and D. H. Welte, 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p.</ref> courtesy Springer-Verlag.]]
:<math>\mbox{OI} = \mbox{S3} \mbox{ (mg/g)}/\%\mbox{TOC} \times 100</math>
:<math>\mbox{OI} = \mbox{S3} \mbox{ (mg/g)}/\%\mbox{TOC} \times 100</math>