Using downhole resistivity to better understand magnetotelluric inversion

Janelle Simpson; Graham Heinson

doi:10.1071/ASEG2018abP047

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa Using downhole resistivity to better understand magnetotelluric inversion
Authors Janelle Simpson^a and Graham Heinson^b
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^a Geological Survey of Queensland, 1 William Street Brisbane University of Adelaide Adelaide, , SA, [email protected] ^b Department of Earth SciencesUniversity of Adelaide, Adelaide, , SA, 5005, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2018abP047
- Published online: 01 Dec 2018

Abstract

Previous studies have used downhole resistivity logs either as a direct constraint during magnetotelluric inversion or as a qualitative validation of inversion accuracy. This study instead uses synthetic 1D magnetotelluric modelling based on downhole resistivity to better understand results of 1D, 2D and 3D inversion.

One-dimensional models with representative geology for the area were generated directly from downhole resistivity data. These models were used to generate synthetic data, which was then inverted using a range of methods. Synthetic modelling made a significant contribution to selecting an appropriate inversion technique and the quality of the interpretation. Joint use of SimPEG MT1D and Occam 2D inversions proved the most effective combination to understand the geology of the project area.

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References

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/content/journals/10.1071/ASEG2018abP047

Article Type: Research Article

Keyword(s): down-hole resistivity; Magnetotelluric inversion; Occam; SimPEG; synthetic modelling

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oa Using downhole resistivity to better understand magnetotelluric inversion

Abstract

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