All zone apparent resistivity of magnetic field source wide field electromagnetic method: study in uniform half-space model

摘要

By constructing the obtaining apparent resistivity in underground uniform half-space model and combining the expression of apparent resistivity in magnetic field source wide field electromagnetic method, apparent resistivity in the model is calculated by using the dichotomy iterative method. Compared with solving the apparent resistivity by wide field electromagnetic method in a direct way, the difficulty of acquiring apparent resistivity is reduced, and a more suitable method for calculating apparent resistivity is found. Investigate the different apparent resistivities under the different frequency of electromagnetic field, and contrast and analysis electric field components, all time apparent resistivities and absolute values of relative errors of apparent resistivities of magnetic field source wide field electromagnetic method and controlled source audio-frequency magnetotelluric method to detect advantages of wide field electromagnetic method in calculation and accuracy in underground uniform half-space model.