From 1 - 10 / 6834
  • The Forbes Geology GIS comprises a digital compilation of regional geological mapping of the Forbes 1:250,000 sheet by AGSO and the NSW DMR under the National Geoscience Mapping Accord from 1995 to 1999. The data package includes all mapping data from the 6 component 1:100,000 geological sheets; Parkes, Grenfell, Bogan Gate, Marsden, Condobolin and Wyalong. The GIS includes polygon and line layers depicting outcropping and buried rock types, structures, and regolith landforms. It also includes point layers depicting outcrop descriptions; mineral occurrences; geochemical, thin section and geochronological samples; georeferenced photographs; structural readings; and drill hole locations. Images of AGSO's airborne magnetic and radiometric data, and a depth to slightly weathered bedrock model are included.

  • This module is part of the AGSO-APIRA Australian Petroleum Systems Project. Eight basin modules were examined which covered almost the entire North West Shelf, the Petrel Sub-basin, as well as the Papuan basin in PNG. Two relational databases were established containing the biostratigraphic data (STRATDAT) and reservoir, facies and hydrocarbon shows data (RESFACS). These databases were linked by application programs which allow time series searching using geologically intelligent routines. Petroleum systems analyses were conducted on each area, with key results focussing upon the comparison of source quality and timing of generation between similar systems in different areas.

  • WinBury is a one-dimensional heatflow modelling package which takes well stratigraphic data and maturity as input, and outputs computed palaeotemperature and downhole maturity (using the industry standard algorithm of Burnham & Sweeney, 1992). By forward modelling the palaeowaterdepth (directly linked to palaeo-sea bottom temperature) and palaeoheatflow variables, a best fit may be derived to observed maturity data, implying a valid palaeotemperature model at all levels in the well. This palaeotemperature model is then applied to the kerogen types present in the source rocks (using industry standard algorithms of Tissot and Welte, 1978) to predict when source rocks would generate and expel hydrocarbons.

  • Fresh groundwater stored in coastal aquifers constitutes an important resource for humans and the natural environment. However, many Australian coastal aquifers are vulnerable to seawater intrusion (SWI), which is the landward encroachment of seawater into coastal aquifers. SWI can significantly degrade water quality and reduce freshwater availability. In response to the threat posed by SWI, Geoscience Australia and the National Centre for Groundwater Research and Training, in collaboration with state and territory water agencies, have undertaken a national-scale assessment of the vulnerability of coastal aquifers to SWI. This report describes one of the project's technical components, the Mathematical Analysis. This project developed a method for first-order assessment of SWI extent under current conditions and propensity to change in SWI extent due to various stressess associated with climate change and future extraction. The method is an extension to an existing analytical sharp-interface solution and involves the use of partial derivative to quantify rates of change in SWI extent for the various stresses.

  • Fresh groundwater stored in Australian coastal aquifers constitutes an important resource for humans and the natural environment. However, many Australian coastal aquifers are vulnerable to seawater intrusion (SWI) - the landward encroachment of seawater into coastal aquifers. SWI can significantly degrade water quality and reduce freshwater availability. In response to the threat posed by SWI, Geoscience Australia (GA) and the National Centre for Groundwater Research and Training (NCGRT), in collaboration with state and territory water agencies, have undertaken a national scale assessment of the vulnerability of coastal aquifers to SWI. This assessment aims to identify the coastal groundwater resources that are most vulnerable to SWI and considers the future consequences of over-extraction, sea-level rise, and recharge-discharge variations associated with climate change. In order to achieve the project aims, the study comprised five technical assessments to analyse factors contributing to the vulnerability of coastal aquifers: (i) vulnerability factor analysis (VFA); (ii) coastal aquifer typology; (iii) mathematical analysis; (iv) SWI quantitative and qualitative vulnerability indexing; and, (v) future land surface inundation and population growth analysis. This report covers the VFA component of the project which provides a first-pass, regional assessment of SWI vulnerability indicators in Australia's coastal areas based on state and territory groundwater datasets for individual groundwater bores. A large number of measurements were collated for this project. In total, more than 1.7 million groundwater levels and more than 1.1 million salinity measurements were compiled and evaluated.

  • Contained in: Proceedings of papers presented at an industry workshop held in Perth, 20 June 2002. Edited by K.F. Cassidy (See link)

  • The integrity and strengths of multi-technique terrestrial reference frames such as ITRF2000 depend on the precisely measured and expressed local tie connections between space geodetic observing systems at co-located observatories. A local tie survey was conducted at the Mount Stromlo Satellite Laser Ranging (SLR) observatory, in Canberra in August of 2006. The aim of the survey was to precisely measure the local terrestrial connections between the space-based geodetic observing systems co-located at the observatory, which include GPS, GLONASS, SLR and DORIS. In particular, this report documents the indirect measurement of the SLR invariant reference point. Geoscience Australia has routinely performed classical terrestrial surveys at Mount Stromlo, including surveys in 1999, 2002 and 2003 (post-fire). A high precision survey was conducted between the survey pillars surrounding the SLR observatory. These survey pillars were monitored to ensure their stability as part of a consistent, stable terrestrial network from which local tie connections were made to the SLR and other observing systems. The relationship between points of interest included the millimetre level accurate connections and their associated variance covariance matrix.

  • No product available. Removed from website 25/01/2019

  • No product available. Removed from website 25/01/2019