Otway Basin

Detailed Report
Petroleum Publications
Petroleum Geology of
South Australia
The oil-prone Morum Sub-basin petroleum system
Otway Basin Fact Sheet
Oil Strandings in the Southeast of South Australia
Otway Basin Hot Sedimentary Aquifers & SEEBASE (TM) Project - Updated 2010
Contact a Geologist

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detailed Regional Map

 

 otway basin location map
Age ?Jurassic - Late Cretaceous

Onshore Area in
South Australia

Offshore Area in
South Australia

9650 km2 (3 730 sq. miles)

50 000 km2 (19 300 sq. miles)

Depth to target zones 1000 - 4000+ m
Thickness > 9 km
Hydrocarbon shows Onshore commercial gas from Pretty Hill Formation and Windermere Sandstone member, 2000 bbl oil recovered o teat from Sawpit sandstone; offshore oil shows and non-commercial gas
First commercial discovery 1987 gas (Katnook 1)
Identified reserves 76.9 PJ (72.8 x 1012 Btu) sales gas (in 5 fields)
Undiscovered resources
(50% prob.)		 1630 PJ (1545 x 1012 Btu) sales gas (PIRSA estimate, April 1995) - not including deep water
Production (12 months to December 2007)

1.6 PJ sales gas; 1566 kL condensate (Katnook, Ladbroke Grove); 11 337 t saleable CO2 (Caroline)

Basin type Rift
Depositional setting Fluvial - lacustrine - marginal marine - deep water marine
Reservoirs Braided and meandering fluvial, deltaic and slope fan sandstones
Regional structure Early half graben, late shelf collapse
Seals Marine and lacustrine shales
Source rocks Early restricted lacustrine, later marginal marine to marine?
Depth to oil/gas window 2800 - 4000+ m (oil); 2600 - 4000+ m (gas)
Number of wells 91 (9 development / appraisal)
Seismic line km 10 492 2D, 711 km2 onshore; 25 842 2D, 373 km2 offshore

 

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