Modelling Seismic Reflections In Central Australia By The 3D Isochronal Technique

S. Cao; B. R. Goleby; B. L. N. Kennett

doi:10.1071/EG991525

ISSN: 0812-3985
E-ISSN: 1834-7533

Modelling Seismic Reflections In Central Australia By The 3D Isochronal Technique
Authors S. Cao^a, B. R. Goleby^b and B. L. N. Kennett^c
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^a School of Earth SciencesFlinders University of South Australia, GPO Box 2100 Adelaide, SA, 5001 ^b Bureau of Mineral ResourcesGeology and Geophysics, PO Box 378 Canberra, ACT, 2601 ^c Research School of Earth SciencesAustralian National University, GPO Box 4 Canberra, ACT, 2601
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 22, Issue 3, Sep 1991, p. 525 - 532
DOI: https://doi.org/10.1071/EG991525
- Received: 29 Nov 1990
- Published online: 01 Sep 1991

Abstract

A simple and efficient 3D isochronal modelling technique has been developed to study elastic wave reflections with full inclusion of diffractions. This modelling technique employs an integral representation of reflections from a surface or a scatterer. High frequency asymptotic approximations are used for the propagation between the seismic source or receiver and a surface or a scatterer. At a scattering region, first order approximations are assumed. With these approximations, the reflected seismograms are calculated by convolving the time derivative of a source function with a model weight function for a particular source-receiver pair. The weight function at a time is evaluated by a line integral along a contour on a reference surface for which the total travel time from source to receiver via the contour is equal to the time. The modelling technique can be used to study the validity of seismic interpretations by comparing observed data with synthetic data calculated from interpreted models. If the resemblance between the observed and calculated data is strong, it is likely that the interpretation is correct. Here, the modelling technique is used to investigate the nature of reflected energies from the Gardiner Fault and the Redbank Thrust Zone and also to model possible structures to explain the seismic responses observed at the base of the Amadeus Basin sequences. Thus, we hope to achieve better understanding of the structure of the basin in central Australia.

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References

Cao, S.-H. – Kennett, B. L. N., (1989). ‘Reflection seismograms in a 3-D elastic model: An isochronal approach’. Geophys. J. 99, 63-80.
Cao, S.-H., Kennett, B. L. N., and Goleby, B. R., (1990). ‘3D isochronal modelling of reflections from the deep crust: application to reflection profiling in central Australia’. Tectonophysics 173, 119-128.
Goleby, B. R., (1989). The crustal structure of the Arunta Block, central Australia: Results from deep seismic reflection profiling. Ph.D. thesis, Australian National University, Canberra, ACT.
Goleby, B. R., Wright, C, Collins, C. D. N., – Kennett, B. L. N., (1988). ‘Seismic reflection and refraction profiling across the Arunta Block and the Ngalia and Amadeus Basins’. Aust. J. Earth Sci. 35, 275-294.
Goleby, B. R., Kennett, B. L. N., Wright, C, Shaw, R. D., and Lambeck, K., (1990). ‘Seismic reflection profiling in the Proterozoic Arunta Block, central Australia: processing for testing models of tectonic evolution’. Tectonophysics 173, 257-268.
Korsch, R. J., and Lindsay, J. F., (1990). ‘Sequence stratigraphy of the latest Proterozoic-Cambrian Pertaoorta Group, northern Amadeus Basin, central Australia’. BMR Bulletin 236, in press.
Lindsay, J. R, and Korsch, R. J., (1989). ‘Interplay of dynamics and sea-level changes in basin evolution: an example from the intracratonic Amadeus Basin, central Australia’. Basin Research 2, 3-25.
Raynaud, B. A, (1988). ‘Diffraction modelling of 3-D lower-crustal reflectors’. Geophys. J., 93, 149-161.
Shaw, R. D., (1987). Basement uplift and basin subsidence in central Australia. Ph.D. Thesis, the Australian National University, Canberra, ACT.
Shaw, R. D., (1990). ‘The tectonic development of the Amadeus Basin’. BMR Bulletin 236, in press.
Wright, C, Goleby, B. R., Shaw, R. D., Collins, C. D. N., Korsch, R. J., Barton, T, Gre nhalgh, S. A., and Sugiharto, S., (1990). ‘Seismic reflection and refraction profiling in central Australia: implications for understanding the evolution of the Amadeus Basin’. BMR Bulletin 236, in press.

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Article Type: Research Article

Keyword(s): 3D isochronal modelling technique; Amadeus Basin; basement; fault; Seismic reflections

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Modelling Seismic Reflections In Central Australia By The 3D Isochronal Technique

Abstract

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