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A potential dolostone reservoir in the Georgina Basin: the Lower Ordovician Kelly Creek Formation

Created 17/10/2025

Updated 17/10/2025

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The extensive, dolostone unit of the Lower Ordovician Kelly Creek Formation in the Toko Syncline, Georgina Basin, has significant potential as a hydrocarbon reservoir with variable porosity and permeability characteristics. The porous dolostone is 107 metres thick. Measured porosities of 19 core plugs from this section average 11 per cent, average horizontal permeability (gas) was 234 md, and vertical permeability (gas) 28 md. Permeability is more variable vertically, being generally low but with random higher values. Porosity is dominantly intercrystalline in mottled and stratified distribution, with associated vug, channel, fracture and breccia types; the porosity developed late in diagenesis, during and after pervasive dolomitisation of the sequence. The dolostone interdigitates with overlying thin calcareous dolomitic sandstone beds which have higher porosity (19%) and permeability (KaH 270 md, KaV 54 md). Traces of liquid hydrocarbons in the dolostone and previously reported gas flows from the overlying sandstone in AOD Ethabuka No. 1 indicate significant potential for these porous units as a reservoir in suitable structural traps.

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Field Value
Title A potential dolostone reservoir in the Georgina Basin: the Lower Ordovician Kelly Creek Formation
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/f26fa374-84b6-42b0-9c95-aaa68bece71c
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "coordinates": [
    [
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        134.0,
        -26.0
      ],
      [
        142.0,
        -26.0
      ],
      [
        142.0,
        -18.0
      ],
      [
        134.0,
        -18.0
      ],
      [
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "A potential dolostone reservoir in the Georgina Basin: the Lower Ordovician Kelly Creek Formation". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/a-potential-dolostone-reservoir-in-the-georgina-basin-the-lower-ordovician-kelly-creek-formatio