A method for calibrating Australian temperature-depth models

Desmond Fitzgerald; Raymond Seikel

doi:10.1081/22020586.2010.12042012

ISSN: 2202-0586
E-ISSN:

oa A method for calibrating Australian temperature-depth models
Authors Desmond Fitzgerald^a and Raymond Seikel^b
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^a Intrepid Geophysics, Unit 2, 1 Male Street, Brighton Victoria, Australia, 3186, [email protected] ^b Intrepid Geophysics, Unit 2, 1 Male Street, Brighton Victoria, Australia, 3186, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12042012
- Published online: 01 Dec 2010

Abstract

Summary

The Australian geothermal industry is moving rapidly, and in that process requires a lot from geophysics to aid in characterising regional prospectivity for exploitable heat resources.

Various groups are using hybrid methods to estimate ‘Curie point’ temperatures at depth, or alternatively, the temperature at 5 kilometres below the surface. Deep drilling observations and airborne magnetic compilations are the key components, together with a basement geology interpretation. Several generations of this work are already published with more to come.

A method to test these maps and also help characterise uncertainty is proposed based upon a deep 3D continental model scale, extending to the lithosphere. Variable surface temperature and heat flow grids, based upon remote sensing are used, together with a simple lithosphere boundary condition. The heat diffusion is then employed to test the temperature-depth maps. Progress on applying this method to Australia is reported.

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References

Bouligand, C., Glen, J., Blakely, R., 2009, Mapping Curie temperature depth in the western United States with a fractal model for crustal magnetization, J. OF Geophysical Research, VOL. 114
Caratori Tontini, F., Cocchi, L., Carmisciano, C., 2009, Rapid 3-D forward model of potential fields with application to the Palinuro Seamount magnetic anomaly (southern Tyrrhenian Sea, Italy) J. OF Geophysical Research, VOL. 114
Chopra, P., Holgate, F., 2005, A GIS analysis of temperature in the Australian crust, Proceedings of the World Geothermal Congress 2005, Antalya, Turkey, 24-29 April 2005.
Li, J.R., Greengard, L., 2007, On the numerical solution of the heat equation I: Fast solvers in free space. Journal of Computational Physics 226
Maus, S., Gordon, D., Fairhead, D., 1997, Curie-temperature depth estimation using a self-similar magentization model, Geophysics J. Int 129, 163-168
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Sandiford, M., Hand, M., McLaren, S., 1998, High geothermal gradient metamorphism during thermal subsidence, Earth and Planetary Science Letters 163, 149– 165
Stavrev, P., Reid, A., 2007, Degrees of homogeneity of Potential fields and structural indices of Euler deconvolution, Geophysics,Vol. 72, NO. 1
Stein, C.A., 1995, Global Earth Physics A Handbook of Physical Constants AGU Reference Shelf 1

/content/journals/10.1081/22020586.2010.12042012

Article Type: Research Article

Keyword(s): Continental scale 3D Geology models; EM spectrum; High Energy photons; Sensing Heat Flow Anomalies

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Abstract

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