This study was undertaken by the Australian Mineral Development Laboratories on behalf of the South Australian Department of Mines and includes petrographic descriptions, heavy mineral and clay analyses, grain sorting, roundness and sphericity determinations, and trace element analyses. The heavy mineral analyses reveal a distribution which not only distinguishes the Otway Group from the remaining sediments, but suggests sub-division of that group into three sequences which can be correlated from well to well. Relative concentrations of the clay minerals, smectite and the kaolin group, indicate basic differences between the Otway Group, the Upper Cretaceous and the Tertiary sediments, but sensitivity to environment of deposition and diagenesis creates some inconsistencies. Spectrographic analyses indicate that the trace elements, especially phosphorus and vanadium, are also influenced predominantly by environment of deposition, and are not suitable for regional correlation. Grain sphericity, roundness, and sorting measurements show no systematic differences that can be related to other properties of the sediments. The above properties are integrated with other sedimentary parameters, such as electric log character, to assist in correlation of sedimentary sequences from well to well. In this way Otway Group sediments in Kalangadoo 1 are subdivided into 4 units on the basis of heavy minerals, clay minerals, electric logs, and a dipmeter survey. Using the same parameters, these sequences are correlated with equivalent sequences in all of the deeper petroleum exploration wells in the Gambier Embayment. Similar subdivision of the Upper Cretaceous and Tertiary sequences is not possible at this stage due primarily to the few drill cores available.