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==Rock-eval pyrolysis==

==Rock-eval pyrolysis==

[[file:evaluating-source-rocks_fig6-1.png|thumb|{{figure number|1}}. Copyright: Tissot and Weite, 1984; courtesy Springer-Verlag,.]]

[[file:evaluating-source-rocks_fig6-1.png|thumb|{{figure number|1}}From Tissot and Weite.<ref name=ch06r12 /> Courtesy Springer-Verlag.]]

In Rock-Eval pyrolysis, a sample is placed in a vessel and is progressively heated to [[temperature::550&deg;C]] under an inert atmosphere. During the analysis, the hydrocarbons already present in the sample are volatized at a moderate temperature. The amount of hydrocarbons are measured and recorded as a peak known as S₁ Next pyrolyzed is the kerogen present in the sample, which generates hydrocarbons and hydrocarbon-like compounds (recorded as the S₂ peak), CO₂, and water.<ref name=ch06r12>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p. The best overall reference for petroleum geochemistry.</ref> The CO₂ generated is recorded as the S₃ peak. Residual carbon is also measured and is recorded as S₄.

In Rock-Eval pyrolysis, a sample is placed in a vessel and is progressively heated to [[temperature::550&deg;C]] under an inert atmosphere. During the analysis, the hydrocarbons already present in the sample are volatized at a moderate temperature. The amount of hydrocarbons are measured and recorded as a peak known as S₁ Next pyrolyzed is the kerogen present in the sample, which generates hydrocarbons and hydrocarbon-like compounds (recorded as the S₂ peak), CO₂, and water.<ref name=ch06r12>Tissot, B., P., Welte, D., H., 1984, Petroleum Formation and Occurrence, 2 ed.: New York, Springer-Verlag, 699 p. ''The best overall reference for petroleum geochemistry.''</ref> The CO₂ generated is recorded as the S₃ peak. Residual carbon is also measured and is recorded as S₄.

[[:file:evaluating-source-rocks_fig6-1.png|Figure 1]] shows the cycle of analysis and the corresponding recording.

[[:file:evaluating-source-rocks_fig6-1.png|Figure 1]] shows the cycle of analysis and the corresponding recording.