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Magnetization

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Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13527914
... ABSTRACT The convertional approaches for apparent magnetization mapping usually neglect effects of remanence, resulting in large geologic deviation or occurrence of negative magnetization when the subsurface contains strong remanent magnetization. We present a space-domain inversion approach...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583434
... The determination of the total magnetization direction is vital of importance for the inversion and interpretation of magnetic anomalies because the total magnetization direction includes the influence of strong remanent magnetization. The cross-correlation method is commonly used to estimate...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583423
... Natural remanent magnetization (NRM) is the part of rock magnetism, which leads to more complex magnetic data inversion and interpretation. The conventional inversion methods focus on reducing the influence of the remanent magnetization and recovering the depth and shape of magnetic sources...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428268
... We present a methodology for estimating the remanent magnetization direction via a new approach of the equivalent layer technique. Our method is grounded on the fact that the total magnetization of a magnetic source is the vectorial sum of its induced and remanent magnetizations. We reformulate...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427184
... In this paper, we develop a method of jointly inverting airborne gravity gradiometry (AGG) and total magnetic intensity (TMI) data in the presence of remanent magnetization. The goal is to obtain structurally similar 3D density and magnetization models. In addition, in the areas with remanent...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426827
... Magnetic data have been widely used for understanding basin structures, mineral deposit systems, and the formation history of volcanism-related geological systems. However, the conventional approaches to magnetic data interpretation, particularly for interpreting magnetization directions...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215371
... ABSTRACT We propose a technique to reconstruct the magnetic anomaly from a dike in a way that the influence of the induced magnetization, remanent magnetization, and geological dip are completely removed, resulting in a new totally symmetric anomaly that could avoid the need of reduction...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216857
... ABSTRACT Proper interpretation of magnetic data requires an accurate knowledge of total magnetization directions of the source bodies in an area of study. In this study, we examined the use of machine learning, specifically Convolutional Neural Network (CNN), to automatically predict...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216745
... ABSTRACT We propose a new method for estimating the total magnetization direction of magnetic sources based on the inversion of total-field anomaly via equivalent-layer technique. This technique is commonly used for processing magnetic data by estimating a magnetic-moment distribution over...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 12–15, 2018
Paper Number: SPE-193282-MS
... – Magnetizing inrush current. – Resultant dip on source side bus voltage. – Total bus voltage harmonic distortion profile. – Residual flux in transformer core To study harmonic resonance overvoltage due to high low order harmonic current inrush it is necessary to assess...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997039
... ABSTRACT The existence of remanent magnetizations poses a great challenge for interpreting magnetic data. Researchers have developed many different strategies to deal with the remanence problem. Recently, an inversion-based method, termed magnetization clustering inversion (MCI), was developed...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17781520
... ABSTRACT The determination of the total magnetization direction is necessary for the processing and interpretation of magnetic anomalies, but it is usually unknown under the presence of strong remanent magnetization. Several common-used methods for determining the total magnetization direction...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17796457
... ABSTRACT Magnetization inversion provides an effective way of interpreting magnetic data complicated by remanence. The magnetization directions recovered from magnetization inversion contain important information that is useful for geology differentiation. However, assessing the uncertainty...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13957163
... ABSTRACT The remanent magnetization may contain information about the formation process, mineralogy, and possibly geological history of different units. The magnitude of magnetization helps define the spatial configuration and structure of magnetic causative bodies, while the magnetization...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13948717
... ABSTRACT We present a new method to estimate the direction of magnetic bodies based upon the correlation between the reduced-to-the-pole (RTP) field and the normalized source strength (NSS) obtained by a transform of the measured magnetic field. The method has several important advantages over...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5855046
... Summary Introduction Most 3D inversion methods in use today have been developed for recovering a 3D magnetic susceptibility model from the magnetic vector field, H , or from the total magnetic intensity (TMI) data, T , assuming that there is no remanent magnetization, that self...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1041
... Summary We present a new approach to total magnetization vector inversion (MVI) by introducing a statistical constraint through fuzzy c-means clustering. The inversion limits the variation of magnetization directions to a small number of possible orientations and thereby achieves stability...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0226
... vertical fourier transform topography inverted magnetic susceptibility fourier transform grid magnetization susceptibility model constraint susceptibility Using vertical Fourier transforms to invert potential-field data to magnetization or density models in the presence of topography Jeffrey D...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1249
... Summary We present a 3D joint inversion method to estimate two physical parameters, gravity and magnetization of subsurface materials using field intensity measurements. In the method, we assume a linear relationship between the density and magnetization to relate gravity with magnetic data...

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