Cenozoic and Winton formation geology project for the Cooper GBA region

\n## **Abstract** \nThe aim of this study was to improve the understanding of the geological architecture and sedimentary fill of the Cenozoic Lake Eyre Basin (LEB), in order to provide a basis for conceptualising its hydrogeology. Petroleum well data was used as a primary source of information as a large number of wells have been drilled in the region and geophysical well logs are run as part of the exploration process. These logs can provide information on distribution of lithologies downhole. The study was divided into two parts: 1. From petroleum well data (principally Gamma Ray well log and mudlogs) Pick key stratigraphic horizons in the Lake Eyre Basin, namely the Namba Formation and Eyre Formation in South Australia and if possible their equivalents in Queensland, the Glendower Formation. The Whitula Formation, present in the northern part of the study area in Queensland, was not differentiated in this part of the study. 2. Understand the distribution of sand and shale in the various formations using models of lithology based on normalised gamma Ray log cut-offs.\n\n\n## **Attribution** \nGeological and Bioregional Assessment Program\n\n\n## **History** \nThis dataset was compiled by GBA project staff for stage 3 reports.\r\nRefer to Fact sheet 21 available from https://www.bioregionalassessments.gov.au/gba.