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Keywords: magnetization
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Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 26–29, 2024
Paper Number: SEG-2024-4072718
... Magnetic surveys involve measuring the response of the total magnetization in rocks. Total magnetization is the vector sum of induced and remanent magnetization. It is common to overlook remanence and assume induced magnetization is dominant during interpretation and modeling. This case study...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 26–29, 2024
Paper Number: SEG-2024-4093931
... We have developed an efficient three-dimensional algorithm for amplitude inversion of magnetic anomalies. To reduce the algorithm’s space complexity and eliminate redundant storage, we implement an equivalent storage technique in the operations involving large matrices. Our optimized algorithm...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 26–29, 2024
Paper Number: SEG-2024-4098886
... Standard susceptibility inversions assume a magnetization in the direction of the ambient inducing field and neglect the role of orthogonal components that are typically due to remanent magnetization. Magnetic vector inversion (MVI) can address this by modeling in terms of the total resultant...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3911157
... Self-demagnetization effects complicate the interpretation of magnetic data for highly susceptible targets by altering both the magnitude and direction of the resultant total magnetization. While magnetic vector inversion (MVI) can model selfdemagnetization effects, the number of model...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3909724
... Buried metallic objects can pose serious risks in civil projects. The locations and parameters of such objects must be determined prior to the engineering work. We develop a method for delineating the 3D positions, and estimating the hazard levels, of buried metallic pipes using magnetic data...
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/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583950
... applications. but in this paper we demonstrate its implementation and performance in 3D magnetic inversion. For inversions with Theory and Method petrophysical information, we constrain the upper and lower bounds of physical properties by adding indicator functions. A geophysical forward modeling problem has...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3420909
... In oil & gas exploration, magnetic anomaly caused by reverse remanent magnetism is often ignored. With the exploration step moving to the fine stage, this problem needs to be paid great attention by the processing and interpretation researcher. In large area data processing, it is difficult...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428303
... at the 2020 SEG Annual Meeting. reservoir characterization objective function cluster center upstream oil & gas constraint cluster center machine learning fcm physical property fcm algorithm fuzzy c-mean inversed result geophysics magnetization artificial intelligence priori...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428248
... Anisotropic magnetic susceptibility (AMS), as an intrinsic property, has been used widely in geological studies based on direct sample measurements. However, its application through geophysical data interpretations is rare despite its influence on the induced magnetization has been noted...
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, September 15–20, 2019
Paper Number: SEG-2019-3216456
... ABSTRACT We present a method to constrain magnetic inversions by magnetotelluric (MT) sounding data at sparse locations for the purpose of imaging volcanic units in the gas exploration. Magnetic data are a cost-efficient means to map volcanic units but lack the necessary depth information. MT...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215222
... ABSTRACT We propose the use of the amplitude of the magnetic vector (B) for qualitative interpretation at low latitudes. The B is computed from transforming the total-field anomaly into the three orthogonal components in the x-, y-, and z-directions. The B generates a maximum over the source...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997835
... ABSTRACT Anisotropic magnetic susceptibility (AMS) contains information about the internal structure of magnetic geologic units and may have the potential to provide information about their formation history and subsequent geologic processes to witch these units were subjected. We examine...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997592
... ABSTRACT A simple relation exists between the depth to basement and gravity or pseudo-gravity fields. Based on this relation, a method to recover the density (or magnetization) contrast function and the basement morphology under sedimentary basins is developed. Use of this method is possible...
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-2016-13871310
... ABSTRACT The effect of remanence has long been recognized as an obstacle for the interpretation and modeling of magnetic data. In this paper, we propose a Cooperative Magnetic Inversion (CMI) algorithm for the 3-D inversion of magnetic data affected by remanent magnetization. The CMI algorithm...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13925371
... ABSTRACT Potential field exploration generates a large amount of data, which require special techniques of high-adaptability and high-speed to process meaningfully. This paper proposed an inversion method for gravity gradiometry data, generalized from magnetic dipole localization method...

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