Deep electromagnetic imaging of the Bathurst No. 12 deposit: 3-D forward modeling, 2-D inversion and sensitivity tests

Pilar Queralt; Alan G. Jones; Juanjo Ledo

doi:10.1190/1.1817289

Deep electromagnetic imaging of the Bathurst No. 12 deposit: 3-D forward modeling, 2-D inversion and sensitivity tests

Pilar Queralt, Alan G. Jones^*, Juanjo Ledo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

A detailed three-dimensional (3-D) numerical electrical resistivity model of the Bathurst No. 12 deposit (New Brunswick) has been constructed using available geological and geophysical information. This model facilitates studies of the resolution capabilities of audio-magnetotellurics (AMT) at locating and defining mineral targets, and of methods of optimizing data acquisition. Different conditions were analyzed: presence of overburden, dimensions and positions of the ore body, and varying data sampling. The behavior of 3-D EM fields is compared with 2-D ones. The 3-D and 2-D responses are similar at high frequencies, but at low frequencies only those responses for current flow perpendicular to the body (TM mode in 2-D) are reasonably alike. The 2-D inversions show that the position and top of the 3-D ore body can be well resolved, but not the bottom and resistivity of the body.

Original language	English
Pages (from-to)	484-487
Number of pages	4
Journal	SEG Technical Program Expanded Abstracts
Volume	21
Issue number	1
DOIs	https://doi.org/10.1190/1.1817289
Publication status	Published - 1 Jan 2002
Externally published	Yes

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title = "Deep electromagnetic imaging of the Bathurst No. 12 deposit: 3-D forward modeling, 2-D inversion and sensitivity tests",

abstract = "A detailed three-dimensional (3-D) numerical electrical resistivity model of the Bathurst No. 12 deposit (New Brunswick) has been constructed using available geological and geophysical information. This model facilitates studies of the resolution capabilities of audio-magnetotellurics (AMT) at locating and defining mineral targets, and of methods of optimizing data acquisition. Different conditions were analyzed: presence of overburden, dimensions and positions of the ore body, and varying data sampling. The behavior of 3-D EM fields is compared with 2-D ones. The 3-D and 2-D responses are similar at high frequencies, but at low frequencies only those responses for current flow perpendicular to the body (TM mode in 2-D) are reasonably alike. The 2-D inversions show that the position and top of the 3-D ore body can be well resolved, but not the bottom and resistivity of the body.",

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Deep electromagnetic imaging of the Bathurst No. 12 deposit: 3-D forward modeling, 2-D inversion and sensitivity tests

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