Wireline logs from approximately 830 wells have been analysed using in-house script known as ElectroFacies. 42 wells were further analysed using a manual approach to specifically target anomalous results. Preset cut-off values were used to analyse the thickness and percentage of electrofacies for the following formations of the Cooper Basin sequence: Patchawarra, Epsilon, Daralingie, Toolachee and Nappamerri Formations. Cut-off values were determined from careful calibration of core facies and log signatures for four electrofacies: coal, clean sandstone, silty or muddy sandstone, and siltstone/shale. A series of isolith and isopach maps, first produced in 1998 by McLean and Hill, have been further developed by X. Sun and B. Camac (2004) to include recent data and specifically correct anomalous readings. These maps have been produced for sandstone, silty or muddy sandstone, shale/siltstone and coal for the formations analysed. These are intended to provide a general guide for interpretation of Cooper Basin lithofacies distribution and palaeogeography, leading to improved prediction of reservoir, source and seal rocks.