HUN RMS Model Eroded Horizons Grids v01

Abstract

The 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.

RMS geomodelling was used to construct the geological model for the Hunter subregion. The data set contains the eroded horizons extracted from the completed geological model in ESRI grid format. The model was built using data extracted from well completions reports published by mining companies and consultants which record the depth of various formations encountered during drilling works. These data were compiled into model input files (See data set: Hunter deep well completion reports - f2df86d5-6749-48c7-a445-d60067109f08) used to build the RMS model.

The naming convention refers to the geological age and depth (TVD ss = total vertical depth subsea reported to the Australian Height Datum) of the various formations as follows:

Regional horizon name Age (geological stage) Newcastle Coalfield Hunter Coalfield Western Coalfield Central or Southern coalfields

M600 Top Anisian Top Hawkesbury Sandstone Top Hawkesbury Sandstone Top Hawkesbury Sandstone Base Wianamatta Group

M700 Top Olenekian Base Hawkesbury Sandstone Base Hawkesbury Sandstone Base Hawkesbury Sandstone Base Hawkesbury Sandstone

P000 Top Changhsingian Base Narrabeen Group Base Narrabeen Group Base Narrabeen Group Base Narrabeen Group

P100 Upper Wuchiapingian Base Newcastle Coal Measures Base Newcastle Coal Measures Top Watts Sandstone Top Bargo Claystone

P500 Mid Capitanian Base Tomago Coal Measures Base Wittingham Coal Measures Base Illawarra Coal Measures Base Illawarra Coal Measures

P550 Top Wordian Base Mulbring Siltstone Base Mulbring Siltstone Base Berry Siltstone Base Berry Siltstone

P600 Mid Roadian Base Maitland Group Base Maitland Group Base Shoalhaven Group Base Shoalhaven Group

P700 Upper Kungurian Top Base Greta Coal Measures Top Base Greta Coal Measures

P900 Base Serpukhovian Base Seaham Formation Base Seaham Formation

with 'M' referring to Mesozoic and 'P' to Paleozoic

Purpose

For display on HUN 2.12 geological figures (at the time of this metadata Figure 009)

Dataset History

This model was then eroded using the present-day surface topography. The final eroded model has a horizontal resolution of 2000 x 2000 m (x y), with 109 vertical layers for a total of 511,118 cells. The depth ranges between 1185m above sea level and 5062 m below sea level.

Data originally sourced from 44 well completion reports and incorporated into the geological model. The final eroded model horizons were exported from RMS software as .dat files and converted to ESRI grids.

Dataset Citation

Bioregional Assessment Programme (2015) HUN RMS Model Eroded Horizons Grids v01. Bioregional Assessment Derived Dataset. Viewed 22 June 2018, http://data.bioregionalassessments.gov.au/dataset/9678c468-fa91-45ff-a965-e891eb6b07a9.

Dataset Ancestors

• Derived From Geoscience Australia, 3 second SRTM Digital Elevation Model (DEM) v01

• Derived From Australian Coal Basins

• Derived From Bathymetry GA 2009 9sec v4

• Derived From Hunter Groundwater Model extent

• Derived From South Sydney Deep Well Completion Reports V02

• Derived From HUN RMS Output Dat Files v01

• Derived From Hunter deep well completion reports

• Derived From HUN GW modelling DEM v01