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Abstract

Summary

A common use for magnetic data is to locate the edges of subsurface bodies. Numerous transformations have been developed in order to obtain more easily interpretable maps, however many initially require the data to be reduced to the pole (RTP) if they are to be used for edge detection. The RTP operation is unstable at low magnetic latitudes, which affects significant areas of equatorial regions currently of interest to the oil and gas industry. In addition, any remanent magnetisation will often lead to anomalous results.

We demonstrate the advantages and disadvantages of using magnitude transformations, focusing on the scenarios where they are likely to be the most useful: at low latitudes and in the presence of remanent magnetisation. Based on synthetic modelling, magnitude transforms equivalent to 1st or 2nd order derivatives of the magnetic field appear most suitable, however when applied to real data the effects of enhancing the noise level limits the usefulness. The Total Amplitude, which is of the same order as the observed TMI data, has higher centricity than the TMI allowing lineament interpretation, without biasing the result to shorter-wavelength features and accentuating the noise level in the data.

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/content/papers/10.3997/2214-4609.201600632
2016-05-30
2024-04-20

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201600632
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Applying Magnetic Magnitude Transforms to Aid Structural Mapping in Areas Where the RTP Calculation Is Unreliable
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201600632
/content/papers/10.3997/2214-4609.201600632
/content/papers/10.3997/2214-4609.201600632
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