Changes

==Interpreting gas chromatograms==

==Interpreting gas chromatograms==

[[file:oiloil-and-oilsource-rock-correlations_fig8-44.png|thumb|{{figure number|2}}Modified.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-44.png|300px|thumb|{{figure number|2}}Modified.]]

A gas chromatogram is evaluated qualitatively to determine the potential of a rock to generate oil vs. gas. The table below shows how chromatograms for oil- vs. gas-prone rocks are evaluated.

A gas chromatogram is evaluated qualitatively to determine the potential of a rock to generate oil vs. gas. The table below shows how chromatograms for oil- vs. gas-prone rocks are evaluated.

{| class = "wikitable"

{| class = "wikitable"

|-

|-

! Chromatograms of oil-prone rock

! Chromatograms of oil-prone rock || Chromatograms of gas-prone rock

! Chromatograms of gas-prone rock

|-

|-

| Dominated by long-chain carbon compounds (greater than C₁₀ )

| Dominated by long-chain carbon compounds (greater than C₁₀) || Dominated by short-chain carbon compounds from C₁ –C₄

| Dominated by short-chain carbon compounds from C₁ –C₄

|-

|-

| Contain carbon compounds up to C₂₅ or greater

| Contain carbon compounds up to C₂₅ or greater || Contain very few carbon compounds above C₁₀

| Contain very few carbon compounds above C₁₀

|}

|}