Abstract
The controlled-source electromagnetic method (CSEM) has been commonly used as a tool for mineral explorations for more than 30 years. As a new variation of the CSEM, the wide-field electromagnetic method (WFEM) calculates the apparent resistivity with one component of either the electric field or magnetic field. The WFEM has shown potentials for detecting an ore deposit at depth, and the receivers are no longer limited in the far zone, which can significantly improve the efficiency of field-work. In this paper, we carried out a series of numerical simulations using synthetic models to investigate the feasibility of the WFEM in detecting a deeply buried ore deposit in depleted mines. The electric field and the apparent resistivity are shown to estimate the ability of the WFEM to distinguish deeply buried bodies by placing the measurement points at different depths. Our results show that the apparent resistivity of the WFEM is more sensitive than that of observed electric fields in distinguishing the target body. The numerical simulations show that a model with a steel-cased well should be treated seriously since the steel-cased well heavily distorts the electric field and biases apparent resistivity. While after removing the effect of the steel-cased well from the observed electric field, the apparent resistivity of the WFEM can still show better results than the electric field.
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