Potential Field modelling of northern South Australia
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1 Potential Field modelling of northern South Australia Graham Baines, David Giles, Peter Betts.
2 Potential Field Data Allows us to extrapolation between outcrops/drill holes Provides higher lateral resolution than sparse data sets (MT and Passive Seismic) Allows us to expand our interpretations beyond the GOMA line
3 Steps in the Analysis Map based interpretation Unconstrained Inversions Constrained Inversions Forward Models Comparison to the GOMA Line
4 Potential Field Solid Geology Interp. Musgraves and Christie Domain from PIRSA
5 Building the Interpretation
6 Pick Faults/Dykes
7 Potential Field Interp.
8 Potential Field Solid Geology Interp. Musgraves and Christie Domain from PIRSA
9 Modelling Aims Image density and magnetic susceptibility structure Correlate with results of the GOMA line Highlight similarities Understand the differences Determine lithospheric architecture and how it developed
10 Modelling Methods Method Dimensions Model Definition Inversions Unconstrained Mathematical Routinely 3D Constrained Mathematical/ Geological Forward Models Routinely 2D (3D Possible) Geological Boundaries Smooth Smooth/Sharp Sharp Input Structure Nowhere Where Data Everywhere Results Objective Objective* Subjective Use here Constrain Nature of Sources (Depth, Dip, etc) Test/Validate Interpretation * Assuming constraints 100% reliable
11 Unconstrained Inversions Unrealistic low at depth beneath the Officer Basin Can we add in the basin?
12 Constrained 3D Inversions How can we add constraints? 1. Assign starting model 2. Assign a complex reference model 3. Min and max limits on properties 4. Reduce smoothing across known geological boundaries
13 Data included Hierachy of Constraints Measured Petrophysics Downhole Logs Drillhole Stratigraphy Surface Geology Seismic Reflections
14 Example Constraints
15 Inversions in 3D
16 Christie to Nawa Unconstrained
17 Christie to Nawa Constrained
18 Christie, CPR, MCR, Nawa
19 Christie, CPR, MCR, Nawa
20 Christie, CPR, MCR, Nawa
21 Inversions in 3D
22 GOMA Eastern Officer Basin
23 GOMA Eastern Officer Basin
24 Eastern Officer Forward Models Baines et al. (Submitted PCR)
25 Nawa to Musgrave Block
26 Nawa to Musgrave Block
27 Nawa to Musgrave Block
28 Conclusions Potential Field Modelling provides additional constraints on the sub surface structure Reasonable agreement with interpreted seismic structure But agreement is not 100%, an integrated interpretation adds valuable information.
29 Acknowledgements Funding from ARC Linkage Project # PIRSA Including Martin Fairclough, Stephen Petrie, Wolfgang Preiss, Rian Dutch, Marc Davies, Pru Freeman,... Staff and students at Uni. Adelaide Martin Hand, Justin Payne, Kate Selway, Kathryn Cutts,
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