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 of the recovered magnetization directions and its effect on geology differentiation remains a challenge. In this paper, we present the use of magnetization clustering inversion as a powerful and flexible tool for uncertainty analysis. We investigate how the inverted magnetizations are affected by different numbers of clusters assumed, and develop a new and practically useful approach for quantifying the uncertainty and mapping out the high-confidence zones. We apply the proposed inversion method and uncertainty analysis workflow to a field data set from exploration of an iron-oxide-copper-gold (IOCG) deposit from Carajas Mineral Province, Brazil. Numerical results show that the recovered effective susceptibilities are highly consistent with known geology and orebodies, and that the selected high-confidence zones have a high spatial correspondence with the mineralization zones inferred from drillholes and geology.
Presentation Date: Wednesday, September 27, 2017
Start Time: 2:40 PM
Presentation Type: ORAL