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Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
The Onshore Energy Security Program
The Frome AEM Survey, South Australia
Ned StolzGroup Leader, Geophysics
Minerals and Natural Hazards Division Geoscience Australiahttp://www.ga.gov.au/
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Geoscience Australia
• Commonwealth Government – Department of Resources,
Energy and Tourism• Located in Canberra• Quality geoscience to inform
government and community decision making about– Resource exploration– Environmental management– Natural hazard assessment
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Onshore Energy Security Program
• Five year program commenced in 2006 • $59.8 million funding• Goal to encourage energy exploration in
Australia and reduce risk• Precompetitive data and value added products• National and regional scale projects
Fugro Airborne Surveys
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Onshore Seismic Program
• 5800 km of deep reflection seismic acquired and processed
• Funding from OESP, state geological surveys and AuScope
• Interpreted for geodynamic framework and energy implications
• Regional magnetic and gravity inversions and 3D modeling
• Energy prospectivity assessments• Industry workshops • Publications
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Radiometric Map of Australia
• Merged over 550 separate airborne surveys (28 million km) acquired over 40 years
• Data levelled using the Australia Wide Geophysical Survey (AWAGS) flown in 2007
• Released in 2009 and updated every 2 years – Uranium exploration– Geothermal exploration– Geological mapping– Regolith and soil assessment– Environmental applications
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
National Geochemical Survey of Australia
• Consistent catchment outlet sediment sampling across Australia
• 1186 catchments• New continental and
regional scale targeting tool
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
OESP AEM Program: 3 % of Australia
Paterson: 2007-2008Area: 47,600 km2
Line km: 28,200Line spacing: 200 m to 6 km
Paterson: 2007-2008Area: 47,600 km2
Line km: 28,200Line spacing: 200 m to 6 km
Pine Creek: 2008-2009Area: 73,700 km2
Line km: 29,900Line spacing: 200 m to 5 km
Pine Creek: 2008-2009Area: 73,700 km2
Line km: 29,900Line spacing: 200 m to 5 km
Frome: 2010Area: 95,450 km2
Line km: 32,317Line spacing: 2.5 km & 5 km
Frome: 2010Area: 95,450 km2
Line km: 32,317Line spacing: 2.5 km & 5 km
AEM conductance images
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Why regional airborne EM?
• Effective penetration to explorable depths (< 400 m)• Maps thickness of cover units over basement• Distinguishes between sedimentary packages that are
indistinct in gravity and magnetic data– Reactive graphitic rocks (conductive)– Porous and permeable sandstones (resistive)
• Mapping alteration– Clays, micas, sericite– Sulfides– Zones of leaching or increased porosity
• Indicate effectiveness of AEM for detailed exploration• Demonstration of AEM as precompetitive regional data
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Stakeholder engagement and feedback for AEM project
Pine Creek
Paterson
Frome
Frome airborne electromagnetic survey, South Australia, workshop 30 November 2011
Conclusions
• High quality precompetitive data publicly released• Excellent regional mapping products and interpretations• Industry and state surveys recognise the value of AEM
as pre-competitive data• Strong industry engagement
– 20+ companies invested > $3 million of infill prior to surveys commencing
– National Water commission partner in Pine Creek Survey– DMITRE a significant partner in Frome AEM survey
• Measurable exploration investment– Drilling programs have been announced based on GA’s survey
data– Numerous companies have made additional investments in
detailed AEM infill surveys