Potential-field studies supporting the seismic data in the Georgina Basin-Arunta Province region, Northern Territory
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1 Potential-field studies supporting the seismic data in the Georgina Basin-Arunta Province region, Northern Territory Richard Chopping 1, Clarke Petrick 2, Indrajit Roy 1, Tony Meixner 1 1 Geoscience Australia 2 NT Geological Survey
2 Outline 3D map of Georgina-Arunta area Worming of potential-field data Additional image processing of potential-field data Forward modelling of 09GA-GA1 seismic line Inverse modelling in 3D map area
3 3D map 3D map is being constructed in the Georgina-Arunta region by Geoscience Australia and the NTGS Compiles available geophysical data and geological interpretations in the region in their true 3D positions Project area encompasses these seismic lines: 2009 Georgina-Arunta Northern portion of the 2008 Gawler -Officer-Musgrave- Amadeus seismic line Older seismic data in the Arunta region Aim is to produce a 3D geophysical map by end June 2011
4 3D map & available potential-field data 500 km 670 km
5 Worming of potential-field data Shown on the previous slide were worms of the gravity and magnetic data These highlight edges of structures plus allow inference of dip of these structures Worms migrate upwards in the mirror-image of the dip of a structure Individual worm Lowest worm point Highest worm point Slices through worm sheet High density Higher density Fault contact Lower density
6 Worms Worms suggest dip of interface is to ~SW
7 Additional processing Aim is to produce images to assist in the interpretation of structural trends away from the seismic line Many possibilities: Upward-continuation Reduction to the pole (RTP) for magnetics Analytic signal Tilt derivatives Analytic signal of TMI provides a useful guide to trends away from seismic data
8 3D map & available potential-field data Provides a clearer picture (compared with TMI) of features such as Casey Inlier heading underneath Amadeus Basin on S end of 09GA-GA1 seismic line Useful product for interpretation of surface boundaries of provinces and of surface trace of major faults Assists in constraining 3D geometries away from seismic lines
9 Forward modelling Forward modelling is where a geological model, attributed with physical properties, has its geophysical response calculated Gravity is more sensitive to deeper features and is preferred for crustal-scale investigations Nevertheless, magnetic data often provides signals of significant faults Geophysical response compared to known geophysical response extracted along a line
10 Forward versus inverse modelling Geophysical data Forward modelling 3D map: gravity 3D map: TMI Inverse modelling Property model
11 Forward modelling Observed gravity Observed magnetics
12 Forward modelling Work in progress Forward-modelling is an iterative process 1 st pass combination of seismic interpretation and gravity constraints added Generally only subtle changes required Geometries require further refinement Multiple hypotheses regarding geometries need further evaluation
13 Forward modelling: blank slate
14 Forward modelling: 2 layer model
15 Forward modelling: initial fit to seismic
16 Forward modelling: hypothesis 1
17 Forward modelling: hypothesis 2
18 Forward modelling: conclusions General fit of seismic interpretation to observed gravity is good Refinements required to account for smallerscale features such as mafic intrusions in the Irindina Several geometries to these intrusions explain both the seismic and the gravity Incorporation of more detail in basins will help to refine geometries of these basins
19 Summary and conclusions 3D map of Georgina-Arunta provides context to seismic lines 3D map underpinned by many varied uses of potential-field data Worming of data provides clues to geometries Further geophysical processing assists interpretations away from seismic lines Forward modelling confirms, refines and aids seismic interpretation
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