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Surface-borehole transient electromagnetic response analysis of spherical conductor

Surface-borehole transient electromagnetic method is an effective deep geophysical exploration method, which is often used to survey metal deposits. The ore body nearby the borehole is the most important exploration target of surface-borehole transient electromagnetic method. Therefore, the study of the observation response of the orebody nearby the borehole has always been an important work. The spherical conductor is a common model for describing targets such as ore bodies, and its forward calculation responses can provide useful orientation and lithologic information for related interpretation in exploration work of borehole transient electromagnetic method. In this paper, we study the forward modeling of surface-borehole measurement electromagnetic responses of spherical conductor. Based on the equivalent model of dipole principle, transient electromagnetic fields calculation equation of spherical conductor is applied. Thus, the surface-borehole transient electromagnetic responses under different conditions are calculated and analyzed. The forward modeling result and analysis conclusion can be used as references for relevant work.