Pedirka and western Eromanga basins depth and isochore maps - Data package and explanatory notes

This data package provides depth and isochore maps generated in support of the energy resource assessments under the Australia’s Future Energy Resources (AFER) project. Explanatory notes are also included.The AFER project is part of Geoscience Australia’s Exploring for the Future (EFTF) Program—an eight year, $225 million Australian Government funded geoscience data and precompetitive information acquisition program to inform decision-making by government, community and industry on the sustainable development of Australia's mineral, energy and groundwater resources. By gathering, analysing and interpreting new and existing precompetitive geoscience data and knowledge, Geoscience Australia is building a national picture of Australia’s geology and resource potential. This will help support a strong economy, resilient society and sustainable environment for the benefit of all Australians. The EFTF program is supporting Australia’s transition to a low emissions economy, industry and agriculture sectors, as well as economic opportunities and social benefits for Australia’s regional and remote communities. Further details are available at http://www.ga.gov.au/eftf.The depth and isochore maps are products of depth conversion and spatial mapping seismic interpretations by Szczepaniak et al. (2023) and Bradshaw et al. (2023) which interpreted 15 regional surfaces. These surfaces represent the top of play intervals being assessed for their energy resource potential (Figure 1). These seismic datasets were completed by play interval well tops by Bradshaw et al. (in prep), gross depositional environment maps, zero edge maps by Bradshaw et al. (in prep), geological outcrop data as well as additional borehole data from Geoscience Australia’s stratigraphic units database.Depth and isochore mapping were undertaken in two to interactive phases; 1.    A Model Framework Construction Phase – In this initial phase, the seismic interpretation was depth converted and then gridded with other regional datasets. 2.    A Model Refinement and QC Phase – This phase focused on refining the model and ensuring quality control. Isochores were generated from the depth maps created in the previous phase. Smoothing and trend modelling techniques were then applied to the isochore to provide additional geological control data in areas with limited information and to remove erroneous gridding artefacts. The final depth maps were derived from isochores, constructing surfaces both upward and downward from the CU10_Cadna-owie surface, identified as the most data-constrained surface within the project area. This process, utilizing isochores for depth map generation, honours all the available well and zero edge data while also conforming to the original seismic interpretation.This data package includes the following datasets: 1)   Depth maps, grids and point datasets measured in meters below Australian Height Datum (AHD, for 15 regional surfaces (Appendix A). 2)   Isochore maps, grids and point datasets measured in meters, representing 14 surfaces/play internals (Appendix B). These depth and isochore maps are being used to support the AFER Project’s play-based energy resource assessments in the Pedirka and western Eromanga basins, and will help to support future updates of 3D geological and hydrogeological models for the Great Artesian Basin by Geoscience Australia.

本数据集包提供了为支撑澳大利亚未来能源资源（Australia’s Future Energy Resources, AFER）项目下的能源资源评估而生成的深度图与等厚线图，并附带说明文档。
澳大利亚未来能源资源（AFER）项目是澳大利亚地质科学局（Geoscience Australia）“探索未来”（Exploring for the Future, EFTF）计划的组成部分——该计划是一项为期八年、由澳大利亚政府资助、斥资2.25亿澳元的地质科学数据与预竞争性信息采集项目，旨在为政府、社区与产业界在澳大利亚矿产、能源与地下水资源可持续开发方面的决策提供依据。
通过收集、分析与解读新增及已有的预竞争性地质科学数据与知识，澳大利亚地质科学局正构建覆盖澳大利亚全国的地质与资源潜力图景，以助力打造强劲的经济、韧性的社会与可持续的环境，惠及全体澳大利亚民众。EFTF计划还将支撑澳大利亚向低碳排放经济转型，赋能工业与农业部门，并为澳大利亚区域及偏远社区创造经济机遇与社会福祉。更多详情可访问http://www.ga.gov.au/eftf。
本次的深度图与等厚线图是Szczepaniak等人（2023）与Bradshaw等人（2023）完成的地震解释成果经深度转换与空间制图后的产物，二者共解释了15个区域界面。这些界面代表了本次能源资源潜力评估中勘探层段的顶面（图1）。支撑该地震数据集完成的资料还包括：Bradshaw等人（待刊）编制的勘探层段井顶数据、沉积环境总图、Bradshaw等人（待刊）编制的零边界图、地质露头数据，以及澳大利亚地质科学局地层单元数据库中的额外钻孔数据。
深度与等厚线制图分为两个交互阶段开展：
1. 模型框架构建阶段：在初始阶段中，先对地震解释成果进行深度转换，再结合其他区域数据集开展网格化处理。
2. 模型优化与质量控制（Quality Control, QC）阶段：本阶段聚焦于模型优化与质量管控。从前一阶段生成的深度图中推导得到等厚线，随后对等地厚线应用平滑与趋势建模技术，以在信息匮乏区域补充地质管控数据，并消除网格化产生的伪影。最终深度图由等厚线推导得到，以项目区内数据约束最充分的CU10_Cadna-owie界面为基准，向上、向下构建各界面。该方法借助等厚线生成深度图，既兼容所有可用的井数据与零边界数据，同时也契合原始地震解释成果。
本数据集包包含以下数据集：
1) 针对15个区域界面的深度图、网格数据集与点数据集，测量基准为澳大利亚高程基准面（Australian Height Datum, AHD），单位为米（附录A）。
2) 代表14个界面/勘探层段的等厚线图、网格数据集与点数据集，单位为米（附录B）。
本次的深度图与等厚线图将用于支撑AFER项目在佩迪卡盆地与西埃罗曼加盆地开展的基于勘探层段的能源资源评估，同时将助力澳大利亚地质科学局后续更新大自流盆地的三维地质与水文地质模型。