The Department has prepared a range of seismic mapping products on a regional basis for major South Australian basins available for viewing and/or purchase.
Products are available for the following prospective petroleum basins:
- Cooper and Eromanga Basin
- Otway Basin
- Officer Basin
Input data for these projects has been derived from a range of sources, including well tops, water bore information, processed seismic data and open file company interpretations.
Petrosys mapping and interpretation software were utilized in all gridding, contouring and data presentation. In general output products comprise Time, Depth and Isopach data for key seismic marker horizons.
Georeferenced tif images of many of these horizons are promoted for viewing through SARIG to highlight extent of coverage and detail. These can be downloaded as georeferenced tif images.
Grids, contours, polygon and fault files and other format files are available on request.
Cooper and Eromanga Basin Mapping Products
Updates of the 2002 C, P and Z horizon maps, for both time and depth, are now available. Created by the Department in 2008/09, these new horizon maps are:
- Based on the original 1997 and updated 2002 mapping
- Included current company interpretations made available to DEM
- Based on Cooper Basin exploration programs since 2000
The new depth grids have been tied to all available wells at the C, P and Z horizon levels.
All data created during the 1997 regional mapping program were updated in 2002 to cater for the change in mapping datum from AGD 84 to GDA 94. Some refinements to the original data and maps were made but these were largely minor in nature.
1997 mapping programme
Regional mapping was undertaken by the Department between 1995 and 1997 to provide explorers with a comprehensive view of the structure of the Cooper Basin. Three key seismic horizons were mapped using existing open file seismic sections and industry interpretations all tied to the extensive network of some 1300 wells in the basin. The horizons mapped were:
- Top Cadna-Owie (C horizon)
- Near-top Permian (P horizon)
- Top Warburton (Z horizon)
These horizons generally divide the basin into the gas prone units of the Permo-Triassic Cooper Basin and the overlying oil prone Jurassic Eromanga Basin. In addition to the C-P-Z horizons maps, another six horizons which divide the stratigraphic section further have been presented based on well data and phantomed on the key interpreted seismic horizons. Horizon maps have been converted to depth and an extensive range of isopach maps have been prepared.
A description of the methods and techniques employed in this mapping project and the horizons interpreted are detailed in the 1998 report, Report on Seismic Mapping Project, Cooper and Eromanga Basins, South Australia, 1995-1997 (PDF - 3.6 MB). Many of the maps contained within this dataset were also included in the original Cooper Basin Folio - Volume 1.
Regional seismic horizon maps
DEM in conjunction with AGSO (now Geoscience Australia) and the Queensland, New South Wales and Northern Territory government agencies merged data for three key seismic horizons to provide a complete regional (national) view of the structure of the Cooper and Eromanga Basins.
This project was completed in 1997/98 as part of the National Geoscience Mapping Accord (NGMA) and was a natural extension of the C-P-Z Mapping Project completed by PIRSA; DMITRE at the same time for the South Australian sector of the Cooper Basin area (see Cooper Basin C-P-Z Maps) and Eromanga Basin (see Eromanga Basin Seismic Maps).
Compilation was based on available seismic profile data, various company interpretations, other open file industry data, well tops and borehole data.
Final data products include Time maps (P and Z horizons), Depth maps (C, P, and Z horizons) and Isopachs (C-P, P-Z and C-Z) as well as grids and contour data for these horizons. All data has been updated to the GDA 94 reference datum in 2001 and are now available as free downloads from SARIG.
In conjunction with the Cooper Basin mapping, DEM completed similar mapping of the Eromanga and Pedirka Basins. This is a much more aerially extensive dataset than the Cooper Basin dataset and covers most of the extent of the Eromanga Basin (about 20% of South Australia). Maps were last updated in 2002.
Otway Basin Mapping Products
Extensive mapping was undertaken between 1992 and 1994 to provide explorers with a comprehensive view of the structure of the Otway Basin. Four key seismic horizons have been mapped using existing open file seismic sections and industry interpretations, and tied to the network of 50 wells in the basin.
These horizons – Top Sherbrook Group (late Cretaceous), Top Eumeralla Formation (early Cretaceous), Top Crayfish Group (early Cretaceous) and Top Basement (early Palaeozoic) generally divide the basin into megasequence units. Horizon maps have been converted to depth and a range of isopach maps have been prepared.
Many of the maps from this mapping are included in the publication Petroleum Geology of South Australia - Volume 1 - the Otway Basin (PDF 25MB)
An example of what is available:
A comprehensive list of the mapped horizons and thickness maps is contained in the Otway Seismic Mapping. A packaged data set is also available at discounted rates as indicated in the available products and price listing:
To order a copy of these data email DEM.firstname.lastname@example.org
Officer Basin Mapping Products
In 1994 new seismic data was acquired in the Officer Basin as part of the South Australian Exploration Initiative. These data were interpreted in conjunction with existing open file company data to produce time and depth maps at Base Cambrian and Basement horizons. Time maps were also prepared over two local areas.
Some of the maps from this mapping are included in the publication Petroleum Geology of South Australia - Volume 3 - the Officer Basin.
This mapping has also been partially incorporated into Geoscience Australia's (formerly Australia Geological Survey Organisation (AGSO)) 1995 Officer Basin Atlas.
This large format atlas summarises the 1993/94 seismic results from the two seismic surveys recorded under the NGMA and SAEI exploration programs.
A comprehensive list of the mapped horizons is contained:
To order a copy of these data email DEM.email@example.com