The Paleogene-Neogene Cover - Thickness and Extent dataset, is one of a set that represents the hydrostratigraphic units of the Great Artesian Basin, which include five major aquifers, four intervening aquitards, and the Paleogene/Neogene cover. The alluvium cover has not been included as it is considered to be transparent to movement of water.
There are six layers in the Paleogene-Neogene cover data set.
A: Cover extent
B: Paleogene/Neogene Volcanics cover extent
C: Outcrop extent
D: Isopach raster
E: Isopach contours
F: Location of data points
The datasets have been derived from the lithostratigraphic intercepts in drillhole data from petroleum exploration wells, water bores, and stratigraphic wells. Seismic correlation and assessment of hydrogeological character based on electrofacies have not been used. The working datasets for this study has been derived primarily from the following databases:
Using data from http://www.ga.gov.au/scientific-topics/water/groundwater/gabwra/data/technical-reports
PEPS-SA (Petroleum Exploration and Production System - South Australia) (Department of Primary Industries and Regions SA, 2011)
WaterConnect Groundwater database (Govt. of SA, 2011)
QPED (Queensland Petroleum exploration database) (Geological Survey of Queensland, 2010).
GABLOG (Great Artesian Basin Well Log Dataset) (Habermehl, 2001)
Additional supplementary information was derived from published reports listed in the references section below.
In the Carpentaria, especially offshore, data derived from seismic interpretation.
This is a regional interpretation for mapping at approximately 1:1 000 000 to produce a broad scale overview, and examination of small areas by collecting extra data is most likely to produce results that differ from this regional interpretation.
This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81675.
Associated report reference:
Ransley, T., Radke, B., Feitz, A., Kellett, J., Owens, R., Bell, J. and Stewart, G., 2015. Hydrogeological Atlas of the Great Artesian Basin. Geoscience Australia. Canberra. [available from www.ga.gov.au using catalogue number 79790]
