Choose Cranfield Geoservices for Basin Analysis – Because we have:
- High level local knowledge of the stratigraphy and structure of southern Queensland basins
- The capacity to expertly review the current knowledge of your area including mapping, drilling, re-interpret and integrate geophysics remote sensing and geological data to solve local and regional anomalous data issues.
- A specific Geological consulting framework and can train your staff in a sequential method to deliver an integrated interpretation of multiple data sets, generate targets and solve unexplained anomalies in your data.
- A comprehensive understanding of the use of geological structure and stratigraphy, remotely sensed and geophysical data to solve anomalies in geological mapping gained through mapping and interpreting large areas of southern and northern Queensland, Papua New Guinea Highlands and Hong Kong.
A Local example of recording and updating the stratigraphy of the eastern Surat Basin.
A report interpreting and integrating regional airborne radiometric and magnetic geophysical imagery over the Surat Basin with boreholes and other data demonstrates that coal seam gas producing units (Springbok Sandstone and Walloon Coal Measures) can be defined in outcrop at the northern basin margin. This package of coal seam gas producing units could be distinguished from the underlying Mesozoic Eurombah Formation and overlying Westbourne Formation. The geochemical signatures of the different geological units were used to update the stratigraphy of the Surat basin in the area of outcrop.
In the subsurface, extension of the boundaries of the coal seam gas producing units in subcrop beneath Cainozoic cover rocks was made through an integrated interpretation of regional airborne magnetics and radiometrics, coal seam gas drilling, stratigraphic drilling, water bore data, previous geological mapping and local knowledge from coal seam mining in the Walloon Coal Measures. To gain a comprehensive understanding of the extent of the entire subcrop extent of these units it was also necessary to understand the deposition sequence of the overlying Cainozoic Condamine Basin. This was through logs of water bore data, integrated with regional radiometrics, satellite imagery and hylogger multispectral analysis of surface and core samples combined with hand-held portable XRF results.
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Basin analysis Expert
Cranfield Geoservices is an internationally featured Geological consultancy in Brisbane with a comprehensive knowledge of basin areas in Queensland. This has been gained through a understanding of the principles of basin analysis and application through geological mapping of the units of basins of southern Queensland and Papua New Guinea. The principal has more than 30 years’ experience in coal and stratigraphic drilling, interpretation of facies variations, wireline logging assisting interpretation of stratigraphic units of basins and a comprehensive knowledge of the lithostratigraphy, chronostratigraphy and sequence stratigraphy of these basins. This knowledge is transferable to other basin areas globally.
Queensland Structural Elements (Including Basins)
Queensland has a series of structural elements with ages ranging from Proterozic to Holocene
The main outcropping mineralized province (containing base and precious metals) is the Proterozoic age Mount Isa inlier in the northwest of the State. Coloured area in blues, browns along the eastern seaboard of Queensland are part of the Tasman Orogenic Zone that ranges in age from Ordovician to Permian. These areas produce mainly precious metals and copper.
Basin areas that overlie these older rocks range in age from Permian to Cretaceous (green areas) in south-eastern Queensland and covering the central area of the state through to the top of Cape York. These basin areas produce most of the states’ oil and conventional gas, coal and unconventional coal seam gas. Basin areas include the major coal resources of the Bowen basin and a proposed new project in the Galilee Basin at the Adani Carmichael Mine Site that is seeking final approvals from government agencies.
Surat basin project data integration (2015-2017)
The image of the Surat Basin in south-eastern Queensland above shows radiometric (K,Th,U channels in red, green, blue) combined in a multicoloured image using colour additive theory to demonstrate the utility of regional airborne radiometrics in showing variations in rock chemistry between geological units. These variations in rock chemistry and distribution of different units is uniquely linked to their genetic stratigraphic sequence, tectonic evolution and post-depositional weathering processes.
Techniques used in this project involved the integration of multiple data sets –
- Digital Geological seamless maps compiled using Arc GIS software,
- Remote sensing of the terrain linked to digital contours contrasting outcropping rock units and fluvial architecture
- national seamless digital geological survey maps,
- interpretation of airborne geophysics using radiometric for surface features and aeromagnetic data for surface and subsurface units,
- Validation of surface and subsurface boundaries using borehole and coal mine data
- Google Earth data linking geological boundaries to borehole data using Kml and Kmz files
Some predicted geological boundaries are shown on the image as thicker black, blue and white lines, however, the variations in the chemistry from airborne radiometrics predicted new boundaries that were confirmed through field work over two separate periods. Many of the basins in the central part of Queensland were mapped prior to the availability of remotely sensed satellite and regional airborne geophysics that has covered most of the Australian continent. The variations in chemistry and topography that can be demonstrated by these techniques combined with regional landscape studies can assist in updating maps of these basins in areas where surficial outcrop is poor.
The cross validation and integration of different geoscience data sets allows for the creation of multiple views of the geology from an Arc GIS created map product using Natural Resources and Mines customised version of the software. Identification of mapping line data as surficial, buried below one or multiple layers allows for a range of 3-dimensional views of the same data.