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Titre du document / Document title

Georgina basin-an early palaeozoic carbonate petroleum system in Queensland

Auteur(s) / Author(s)

DRAPER J. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Geological Survey of Queensland Department of Mines and Energy Block A, 80 Meiers Rd, Indooroopilly Queensland 4068, AUSTRALIE

Résumé / Abstract

Queensland contains a number of carbonate-bearing basins which are under-explored for petroleum, but contain the elements of potentially economic petroleum systems. The oldest such basin is the Neoproterozoic to Ordovician Georgina Basin which straddles the Queensland-Northern Territory border and is traversed by the Ballera to Mount Isa gas pipeline. The basin developed across several major crustal blocks resulting in regional variations in deposition and deformation. Thick Neoproterozoic rocks of the Centralian Superbasin form the base of the sequence in apparently fault-bounded, extensional sub-basins. These rocks are generally tight and source rocks are unknown. The Cambrian to Ordovician rocks have the best petroleum potential with the most prospective part of the basin being the Toko Syncline. The Burke River Structural Belt is less prospective, but is worthy of further exploration. Basin fill consists of Cambrian and Early Ordovician rocks which are dominantly carbonates, with both limestones and dolostones present. In the Early to Middle Ordovician, the rocks became predominantly siliciclastic. The main phase of deformation affecting the Georgina Basin occurred in the Devonian as part of the Alice Springs Orogeny. The Toomba Fault, which forms the western boundary of the asymmetric Toko Syncline, is a thrust fault with up to 6.5 km of uplift. The angle of thrusting is between less than 40 degrees and up to 70 degrees. Rich, marine source rocks of Middle Cambrian age in the Toko Syncline are mature for oil except in the deepest part of the syncline where they are mature for dry gas. The deeper part of the Toko Syncline may be gas saturated. Potential hydrocarbon targets include large folds associated with fault rollovers, stratigraphic traps and fault-bounded traps. Vugular, secondary porosity in dolostones offers the best chance for commercial reservoirs within the Ninmaroo and Kelly Creek formations and Thorntonia Limestone. There are also oolitic carbonates which may have good primary porosity, as well as interbedded sandstones in the carbonates with preserved porosity. Structurally controlled hydrothermal dolomite facies represent potential reservoirs. The dominantly siliciclastic Ordovician sequence is water flushed. Fracture porosity is another possibility (cf. the Palm Valley gas field in the Amadeus Basin). As the deeper part of the Toko Syncline appears to be gas saturated, there may be potential for basin-centred gas. Fine-grained carbonates and shales provide excellent seals. There has not been a valid structural test; although AOD Ethabuka-1 flowed 7,000 m3/d of dry gas, the well was abandoned short of the target depth.

Revue / Journal Title

APPEA journal    ISSN  1326-4966 

Source / Source

Congrès
2007 APPEA conference :   ( Adelaide, 15-18 April 2007 )
Australian Petroleum Production and Exploration Association conference, Adelaide , AUSTRALIE (2007)
2007-  , vol. 47, pp. 107-126[Note(s) :  [672 p.]] [Document : 20 p.] (2 p.3/4) Illustration : Illustration ;

Langue / Language

Anglais

Editeur / Publisher

Australian Petroleum Production and Exploration Association, Canberra, AUSTRALIE  (1996-2007) (Revue)
APPEA, Sydney, AUSTRALIE  (2007) (Monographie)

Mots-clés anglais / English Keywords

Australasia

;

Australia

;

Europe

;

Alps

;

Eastern Alps

;

clastic rocks

;

sedimentary rocks

;

carbonate rocks

;

lower Paleozoic

;

Cambrian

;

Paleozoic

;

Ordovician

;

Precambrian

;

Proterozoic

;

Amadeus Basin

;

Dolomites

;

dolomite

;

sandstone

;

reservoirs

;

secondary porosity

;

stratigraphic traps

;

folds

;

hydrocarbons

;

uplifts

;

orogeny

;

springs

;

Devonian

;

siliciclastics

;

dolostone

;

limestone

;

exploration

;

rivers

;

Middle Cambrian

;

source rocks

;

thrust fault

;

deformation

;

crustal blocks

;

Middle Ordovician

;

upper Proterozoic

;

petroleum

;

carbonates

;

Mots-clés français / French Keywords

Australasie

;

Australie

;

Europe

;

Alpes

;

Alpes Orientales

;

Roche clastique

;

Roche sédimentaire

;

Roche carbonatée

;

Paléozoïque inf

;

Cambrien

;

Paléozoïque

;

Ordovicien

;

Précambrien

;

Protérozoïque

;

Bassin Amadeus

;

Alpes Dolomites

;

Dolomite

;

Grès

;

Réservoir

;

Porosité secondaire

;

Piège stratigraphique

;

Pli

;

Hydrocarbure

;

Surrection

;

Orogenèse

;

Source

;

Dévonien

;

Roche silicoclastique

;

Dolomie

;

Calcaire

;

Prospection

;

Rivière

;

Cambrien moyen

;

Roche mère

;

Faille chevauchement

;

Déformation

;

Bloc crustal

;

Ordovicien moyen

;

Protérozoïque sup

;

Pétrole

;

Carbonate

;

Mots-clés espagnols / Spanish Keywords

Australasia

;

Australia

;

Europa

;

Alpes

;

Alpes Orientales

;

Roca clástica

;

Roca sedimentaria

;

Roca carbonatada

;

Cámbrico

;

Proterozoico

;

Cuenca Amadeus

;

Dolomita

;

Gres

;

Trampa estratigráfica

;

Pliegue

;

Hidrocarburo

;

Orogénesis

;

Fuente

;

Devónico

;

Dolomía

;

Calcáreo

;

Prospección

;

Río

;

Cámbrico medio

;

Roca madre

;

Cabalgamiento

;

Bloque cortical

;

Ordovícico medio

;

Proterozoico sup

;

Petróleo

;

Carbonato

;

Localisation / Location

INIST-CNRS, Cote INIST : 20031, 35400015363402.0060

Nº notice refdoc (ud4) : 19861408



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