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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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1980-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81040 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81040/

Keywords

GA Publication
Journal
NT
QLD
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

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

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

fae9173a-6fed-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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