This report synthesises all existing Delhi-Santos' Cooper Basin area Mesozoic and Permian petroleum source rock geochemical data relating to liquid chromatography, providing a basis for further source rock work to be carried out on a formation-by-formation basis. Various suggestions are made on how to handle the existing data so that a more detailed interpretation can be made. Preliminary interpretations of basic geochemical parameters (Total Organic Carbon and Hydrocarbon Yield) are presented with the view that, at this stage, all results are to be regarded in a broadly regional sense. It is not intended that such results be applied on a field scale. Due to the sampling methods employed, data were difficult to adequately represent in map form, etc. To overcome this, cut-offs were applied with respect to which particular sample results were used, thus reducing the number of useable data points. From this study it is apparent that potential source rock quality is reduced toward the basin margins and over major structural high trends, reflecting regional facies variations. Areas of higher quality generally parallel areas where shaly facies dominate. The data suggest that the best quality potential source rocks within the Eromanga Basin occur within the basal Jurassic (basal Hutton Sandstone / Poolowanna Formation) and middle Jurassic Birkhead Formations. The younger Westbourne Formation and, to a lesser degree, the Murta Member, are secondary in quality. As a result of this, areas to the north of the Jackson-Naccowlah Trend are shown to contain potential source rocks of sufficient quantity and quality to generate significant volumes of liquid hydrocarbons at the present level of maturity. These areas in the past have tended to be downgraded.