Extent of Coal Measures within the Morwell Formation
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## **Abstract** \n\nThe dataset was derived by the Bioregional Assessment Programme from multiple source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement. \n\n\n\nThis is a shapefile of the generalised spatial extent of coal measures within the Morwell Formation. It has been derived from the Morwell Formation Coal Seam contour data in the Latrobe Valley Coal Resources dataset (GUID: d994a979-9224-4540-986d-d123de2fb459). You can find a link to the parent datasets in the Lineage Field in this metadata statement. The History Field in this metadata statement describes how this dataset was derived.\n\n## **Purpose** \n\nThe intention of this shapefile is to indicate the zone of interupted aquifer connectivity in the vicinity of the Morwell Formation. The coal seams act as aquitards and so vertical groundwater connectivity between aquifers overlying and underlying the Morwell Formation stratigraphic sequence is expected to be interupted by the presence of these aquitards.\n\n## **Dataset History** \n\nDigitised, general extent of all the Morwell Formation Coal Seam layers from the Latrobe Valley Coal Resources dataset (GUID: d994a979-9224-4540-986d-d123de2fb459):\n\n\n\n6_M2_THICK\n\n5_M2B_THICK\n\n5_M2A_THICK\n\n4_M1B2_THICK\n\n4_M1B_THICK\n\n3_M1B1_THICK\n\n3_M1A_THICK\n\n2_M1A2_THICK\n\n2_M1A1_THICK\n\n\n\nat 1:100,000 scale. \n\n\n\nFurther edits were made based on Morwell_coal_200k polygon drawn from all Morwell coal seam contours from the Latrobe Valley Coal Resources dataset. The northern and eastern boundaries were altered to reflect the estimated extent of the formation (original polygon is abruptly cut to the Latrobe Valley Coal Resources boundary). The estimated extent was based on Figure 10.27 of Holdgate, G. R. and S. J. Gallagher (2003). Tertiary: a period of transition to marine basin environments. Geology of Victoria. W. D. Birch, (Eds.) Geological Society of Australia Special Publication 23. Geological Society of Australia (Victoria Division). The extent was also checked against stratigraphic picks from petroleum well completion reports Rosedale 1 and Toongabbie 18 south (download from Geoscience Australia Petroleum Well Database http://dbforms.ga.gov.au/www/npm.well.search).\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2015) Extent of Coal Measures within the Morwell Formation. Bioregional Assessment Derived Dataset. Viewed 29 September 2017, http://data.bioregionalassessments.gov.au/dataset/2fe371d3-ca54-4493-a2bf-cedfe6fda138.\n\n## **Dataset Ancestors** \n\n* **Derived From** [Latrobe Valley Coal Resources](https://data.gov.au/data/dataset/d994a979-9224-4540-986d-d123de2fb459)\n\n
## **摘要** 本数据集由生物区域评估计划（Bioregional Assessment Programme）基于多份源数据集衍生而来。源数据集的相关信息可参见本元数据声明中的"谱系（Lineage）"字段；本衍生数据集的制作流程则记载于本元数据声明的"历史（History）"字段中。 本数据集为莫尔韦尔组（Morwell Formation）内含煤系的概化空间范围形状文件（shapefile），其衍生自拉特罗布谷煤炭资源数据集（Latrobe Valley Coal Resources dataset，GUID: d994a979-9224-4540-986d-d123de2fb459）中的莫尔韦尔组煤层等高线数据。父级数据集的链接可在本元数据声明的"谱系"字段中获取，本数据集的衍生制作流程详见本元数据声明的"历史"字段。 ## **数据用途** 本形状文件旨在标识莫尔韦尔组周边含水层连通性受阻的区域。煤层作为隔水层（aquitards），可阻断莫尔韦尔组地层序列上下覆含水层之间的垂向地下水连通性。 ## **数据集历史** 基于拉特罗布谷煤炭资源数据集（GUID: d994a979-9224-4540-986d-d123de2fb459）中的所有莫尔韦尔组煤层图层，数字化得到其概化空间范围，比例尺为1:100000，涉及图层包括： 6_M2_THICK、5_M2B_THICK、5_M2A_THICK、4_M1B2_THICK、4_M1B_THICK、3_M1B1_THICK、3_M1A_THICK、2_M1A2_THICK、2_M1A1_THICK。 后续基于从拉特罗布谷煤炭资源数据集提取的所有莫尔韦尔煤层等高线生成的Morwell_coal_200k多边形图层进行了进一步编辑。为匹配该组地层的估算范围，对多边形的北部和东部边界进行了调整（原多边形被生硬截断至拉特罗布谷煤炭资源数据集的边界）。本次估算范围参考了Holdgate G. R.与Gallagher S. J.（2003）发表的《第三纪：向海相盆地环境过渡的时期》一文的图10.27，该文收录于Birch W. D.主编的《维多利亚州地质》，澳大利亚地质学会特刊第23号，澳大利亚地质学会维多利亚分部。同时，本次范围还对照了来自石油井完井报告《Rosedale 1》和《Toongabbie 18 south》的地层拾取数据，上述报告可从澳大利亚地球科学局石油井数据库（http://dbforms.ga.gov.au/www/npm.well.search）下载获取。 ## **数据集引用** 生物区域评估计划（2015）《莫尔韦尔组内含煤系范围》，生物区域评估衍生数据集，2017年9月29日查阅，访问地址：http://data.bioregionalassessments.gov.au/dataset/2fe371d3-ca54-4493-a2bf-cedfe6fda138。 ## **数据集上游源数据** * **衍生自** [拉特罗布谷煤炭资源](https://data.gov.au/data/dataset/d994a979-9224-4540-986d-d123de2fb459)
