Namoi Leapfrog geological model

## **Abstract** \n\nThis dataset was supplied to the Bioregional Assessment Programme by a third party and is presented here as originally supplied. The metadata was not provided by the data supplier and has been compiled by the programme based on known details.\n\n\n\nThe Namoi Leapfrog geological model developed by CDM Smith for the future Santos' Gunnedah Coal Seam Gas Project (NTEC, 2013) using the software package Leapfrog Hydro™. The geological model was available to the Namoi subregion Assessment team and is considered to be fit for purpose as the basis for the Namoi geological model, developed for the Namoi BA programme.\n\n## **Dataset History** \n\nThis Namoi Leapfrog Model was created by CDM Smith and obtained from Santos Ltd for use in the Namoi Bioregional Assessment. \n\nThere is little documentation available for the geological model, however some is available as part of the Groundwater Impact Assessment for the Gunnedah Coal Seam Gas Project (NTEC, 2013). Each geological layer in the CDM Smith model is represented as a three-dimensional layer that can be continuous or discontinuous within the geological model domain. The thickness of layers and contact between the layers are modelled by the Leapfrog™ software based on interpolation and extrapolation of the input data and the types of stratigraphic relationships assigned in Leapfrog™. The model is discretised into 500 m x 500 m model cells. The thickness of each layer in each cell represents the mean formation thickness at that location. The model domain extends over approximately 53,200 km2 from the Hunter-Mooki Thrust Fault System in the east, to the extent of the Gunnedah Basin units in the south and north, which is outside the boundary of the Namoi subregion. The western boundary of the model domain is marked by the north-westerly groundwater flow direction in the Surat Basin.\n\nSources of data for the model include drilling logs from Santos and the NSW Department of Primary Industries Digital Imaging of Geological System (DIGS®) database, stratigraphic surfaces from the Upper and Lower Namoi groundwater models (McNeilage (2006) and Merrick (2001) respectively), the Gunnedah Bowen Study SEEBASE™ and Santos proprietary mapping of Gunnedah Basin formation tops and outcrop geology from geographic information systems (GIS). The ground surface elevation was determined using the Shuttle Radar Topography Mission (SRTM) 500 m digital elevation model (NTEC, 2013, p. 17, Table 2-1).\n\n## **Dataset Citation** \n\nGeoscience Australia (2016) Namoi Leapfrog geological model. Bioregional Assessment Source Dataset. Viewed 12 March 2019, http://data.bioregionalassessments.gov.au/dataset/26747362-8e20-49df-ab2c-918fba839aa4.

## **摘要**

本数据集由第三方提供给生物区域评估计划（Bioregional Assessment Programme），此处按原始提交状态呈现。数据供应商未提供元数据，本计划依据已知细节自行编制了元数据。

该Namoi Leapfrog地质模型由CDM Smith为桑托斯（Santos）未来的冈尼达煤层气项目（Gunnedah Coal Seam Gas Project，NTEC, 2013）开发，使用Leapfrog Hydro™软件包构建。该地质模型已提供给Namoi子区域评估团队，可作为Namoi生物区域评估（Namoi BA）计划所需的Namoi地质模型的基础，符合使用需求。

## **数据集历史**

本Namoi Leapfrog模型由CDM Smith创建，由桑托斯有限公司（Santos Ltd）获取，用于Namoi生物区域评估。

该地质模型的公开文档较少，但部分内容可从冈尼达煤层气项目的地下水影响评估报告（NTEC, 2013）中获取。CDM Smith模型中的每个地质图层均以三维图层形式呈现，在地质模型域内可呈连续或非连续状态。Leapfrog™软件基于输入数据的插值与外推，以及在Leapfrog™中设定的地层接触关系类型，对图层厚度及层间接触关系进行建模。模型被离散为500 m×500 m的模型网格单元，每个网格单元内的各图层厚度代表该位置的平均地层厚度。模型域范围约为53200 km²，东抵亨特-穆基逆冲断裂系统（Hunter-Mooki Thrust Fault System），南北延伸至冈尼达盆地（Gunnedah Basin）地层单元分布边界，该范围超出了Namoi子区域的边界。模型域的西界以苏拉特盆地（Surat Basin）内西北向地下水流向为标识。

本模型的数据来源包括桑托斯的钻井日志、新南威尔士州初级产业部地质系统数字成像（DIGS®）数据库、上Namoi和下Namoi地下水模型的地层接触面（分别对应McNeilage（2006）与Merrick（2001）的研究）、冈尼达-鲍恩研究SEEBASE™，以及桑托斯的专有冈尼达盆地地层顶面测绘数据与地理信息系统（GIS）获取的露头地质数据。地表高程数据采用航天飞机雷达地形测绘任务（SRTM）500 m分辨率数字高程模型（NTEC, 2013，第17页，表2-1）获取。

## **数据集引用**

澳大利亚地质调查局（Geoscience Australia, 2016）：Namoi Leapfrog地质模型。生物区域评估源数据集。2019年3月12日查阅，http://data.bioregionalassessments.gov.au/dataset/26747362-8e20-49df-ab2c-918fba839aa4。