Three-Dimensional Inversion of Multi-Component Semi-Airborne Electromagnetic Data in an Undulating Terrain for Mineral Exploration

Ke, Zhiyuan; Liu, Yunhe; Su, Yang; Wang, Luyuan; Zhang, Bo; Ren, Xiuyan; Rong, Zhihao; Ma, Xinpeng

doi:10.3390/min13020230

Cited by 7 publications

(7 citation statements)

References 35 publications

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“…At first, we showed the importance of multicomponent inversion .Using all three components increases the accuracy in recovering the resistivity of the body and its boundaries. Our results are in agreement with Ke et al [21]. The number of flight lines is one of the most important factors affecting the cost of the survey.…”

Section: Discussionsupporting

confidence: 94%

“…Subfigures e and f shows that, with using multicomponent inversion the block edges are better recovered in all directions and, moreover, the maximum resistivity values are higher. Our results are in agreement with Ke et al [21] studying multi-component inversion. As a result, all other modellings you will see in the following are multicomponent inversion results.…”

Section: Single and Multi-component Inversionsupporting

confidence: 94%

“…This ellipse equation fits better to short-line sources and not long sources. Ke et al [21] worked on multicomponent 3D inversion of SATEM systems in presence of topography. They used synthetic modelling to demonstrate the importance of multi-component inversion.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Nazari¹,

Rochlitz²,

Günther³

2023

Preprint

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As semi-airborne mineral exploration has limited budgets, it is critical to design experimental procedures that generate data maximizing the desired information We investigate the effects of transmitter-receiver geometries for a variety of anomalies and semi-airborne layouts. Our simulations indicate that 200 m flight line spacing and 100 m point distance are the optimal trade-off between coverage and survey progress for various targets. Based on the target size and distance between the transmitter and the target, the transmitter length should be at least equal to the length of the target and for more than 1 km, at least two or three times the target size. Likewise important are the location and direction of the transmitter cables, which can have great impact on the result of inversion and should be parallel to the target strike. By using more than one transmitter, better results are obtained. If the strike of the target is known, transmitters should be parallel to each other and if not, it is better to use perpendicular transmitters. Results showed that the optimal distance between transmitters is 3 km. Our simulations show that it is even possible to recover targets just below the transmitter in corresponding areas of masked data.

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Section: Discussionsupporting

confidence: 94%

Section: Single and Multi-component Inversionsupporting

confidence: 94%

See 1 more Smart Citation

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Nazari¹,

Rochlitz²,

Günther³

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…This ellipse equation fitted better to short-line sources, not long sources. Ke et al [21] worked on the multi-component 3D inversion of SATEM systems in the presence of topography. They used synthetic modelling to demonstrate the importance of multi-component inversion.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

2023

View full text Add to dashboard Cite

As semi-airborne mineral exploration has a limited budget, it is critical to design experimental procedures that generate data to maximize desired information. We investigated the effects of transmitter–receiver geometries for a variety of anomalies and semi-airborne layouts. Our simulations indicated that flight line spacing of 200 m and a point distance of 100 m provides the optimal trade-off between coverage and survey progress for various targets. Based on the target size and distance between the transmitter and the target, the transmitter length should be at least equal to the length of the target. However, where the distance between the transmitter and the target is more than 1 km, the transmitter length should be at least two or three times the target size. Of similar importance are the location and direction of the transmitter cables, which can have a significant impact on the result of inversion and should be parallel to the target strike. By using more than one transmitter, better results can be obtained. If the strike of the target is known, transmitters should be parallel to each other, and if not, it is better to use perpendicular transmitters. The results of this study showed that the optimal distance between transmitters is 3 km. Our simulations showed that it is even possible to recover targets just below the transmitter in corresponding areas of masked data.

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“…The FV method can effectively resolve complex geological structures using orthogonal Delaunay-Voronoï unstructured grids, as its implementation is complicated and requires high mesh quality [29]. To be suitable for modeling complex terrain and geologic structures, the FE method, using unstructured grids, has been widely used in SAEM modeling [30,31].…”

Section: Introductionmentioning

confidence: 99%

Efficient 3D Frequency Semi-Airborne Electromagnetic Modeling Based on Domain Decomposition

Hui,

Wang,

Yin

et al. 2023

Remote Sensing

Self Cite

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Landslides are common geological hazards that often result in significant casualties and economic losses. Due to their occurrence in complex terrain areas, conventional geophysical techniques face challenges in early detection and warning of landslides. Semi-airborne electromagnetic (SAEM) technology, utilizing unmanned aerial platforms for rapid unmanned remote sensing, can overcome the influence of complex terrain and serve as an effective approach for landslide detection and monitoring. In response to the low computational efficiency of conventional semi-airborne EM 3D forward modeling, this study proposes an efficient forward modeling method. To handle arbitrarily complex topography and geologic structures, the unstructured tetrahedron mesh is adopted to discretize the earth. Based on the vector finite element formula, the Dual–Primal Finite Element Tearing and Interconnecting (FETI-DP) method is further applied to enhance modeling efficiency. It obtains a reduced order subsystem and avoids directly solving huge overall linear equations by converting the entirety problem into the interface problem. We check our algorithm by comparing it with 1D semi-analytical solutions and the conventional finite element method. The numerical experiments reveal that the FETI-DP method utilities less memory and exhibits higher computation efficiency than the conventional methods. Additionally, we compare the electromagnetic responses with the topography model and flat earth model. The comparison results indicate that the effect of topography cannot be ignored. Further, we analyze the characteristic of electromagnetic responses when the thickness of the aquifer changes in a landslide area. We demonstrate the effectiveness of the 3D SAEM method for landslide detection and monitoring.

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Three-Dimensional Inversion of Multi-Component Semi-Airborne Electromagnetic Data in an Undulating Terrain for Mineral Exploration

Cited by 7 publications

References 35 publications

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Efficient 3D Frequency Semi-Airborne Electromagnetic Modeling Based on Domain Decomposition

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