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.

## **摘要**
本研究旨在加深对新生代艾尔湖盆地（Lake Eyre Basin, LEB）地质结构与沉积充填的认识，为构建其水文地质概念模型提供依据。鉴于该区域已钻探大量油气井，且地球物理测井是勘探流程的常规环节，本研究以油气井数据作为核心信息源。此类测井数据可提供井下岩性分布的相关信息。
本研究分为两个部分：
1. 基于油气井数据（主要为伽马测井与泥浆录井数据）识别艾尔湖盆地的关键地层界面，即南澳大利亚州的南巴组（Namba Formation）与艾尔组（Eyre Formation），并尽可能识别昆士兰州对应的格伦多沃组（Glendower Formation）；本部分研究未对昆士兰州研究区北部产出的惠图拉组（Whitula Formation）进行划分区分。
2. 基于归一化伽马测井截断值构建岩性识别模型，明确各地层内砂岩与页岩的分布特征。

## **数据归属**
地质与生物区域评估计划（Geological and Bioregional Assessment Program）

## **数据集历史**
本数据集由GBA项目工作人员为第三阶段报告编制完成。如需查阅详情，请参考https://www.bioregionalassessments.gov.au/gba上发布的第21号情况说明书。