Changes

==Interpreting gas chromatograms==

==Interpreting gas chromatograms==

[[file:oiloil-and-oilsource-rock-correlations_fig8-44.png|300px|thumb|{{figure number|2}}Modified from Moldowan et al. (1992); courtesy AAPG.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-44.png|300px|thumb|{{figure number|2}}Sterane m/z 217 mass fragmentograms of an immature rock extract (bottom left), a hydrous pyrolyzate (top right), and the correlatable oil (bottom right). Modified from Moldowan et al.;<ref name=Moldowan1992>Moldowan, J. M., C. Y. Lee, P. Sundararaman, T. Salvatori, A. Alajbeg, B. Gjukic, G. J. Demaison, N. E. Slougue, and D. S. Watt, 1992, Source correlation and maturity assessment of select oils and rocks from the central Adriatic Basin (Italy and Yugoslavia), in J. M. Moldowan, P. Albrecht, and R. P. Philp, eds., Biological markers in sediments and petroleum: Englewood Cliffs, New Jersey, Prentice-Hall, 411 p.</ref> courtesy AAPG.]]

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.