Citation

Geoscience Australia provides most of its products for free under a Creative Commons Attribution 3.0 Australia Licence. We only require that you reference the use of our data or information using the following citation:
Radke, B.M. & Duff, P., 1980. A potential dolostone reservoir in the Georgina Basin: the Lower Ordovician Kelly Creek Formation. BMR Journal of Australian Geology and Geophysics  5:2:160-163. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

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.
Google map showing geographic bounding box with values North bound -18.0 East bound 142.0 West bound 134.0 South bound -26.0
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Creative Commons Attribution 3.0 Australia Licence

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Date (publication)

1980

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Earth Sciences

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English

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-18.0
East bound
142.0
West bound
134.0
South bound
-26.0

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2014-06-23

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