Apparent Resistivity Calculation Method of the Wide-area, Multi-component Transient Electromagnetic Field

From the transient electromagnetic vector field theory, this paper analyzed the mathematics characteristic of the transient electromagnetic vector field nuclear function. By analyzing, we know that the function forms of vertical and horizontal components of electromagnetic field at non-central points are similar to the function form of the central vertical component. So using curve fitting method, the polynomial mathematical expressions of vertical and horizontal components of electromagnetic field at non-central points can be received. Then, through the analysis of the transient electromagnetic early and late conditions, the paper deduced the apparent resistivity expression of vertical and horizontal components of electromagnetic field at non-central points. Through the array field observation method, vertical component and horizontal component can be synthesized to total vector, which enriched the transient electromagnetic detection observation technology and explain theory. A lot of the theoretical model calculation verifies that the method is correct and effective.