Transient Electromagnetic Detection Method with Cross-Like Grounded-Wire Source

摘要

#$%^&*AU2020100497A420200514.pdf#####Abstract The present invention discloses a transient electromagnetic detection method with a cross-like grounded-wire source, and belongs to the technical field of transient electromagnetic detection methods. For the sake of better mining of geoelectric information contained in each component of a transient electromagnetic field of a grounded-wire source and further improvements in detection accuracy of the transient electromagnetic method with a grounded-wire source and detection capability thereof on 2D and 3D structures, the present invention provides a transient electromagnetic detection method with a cross or cross-like grounded-wire source. With the addition of a vertical or crossed emission source to a conventional rectilinear wire source, responses in the method of the present invention are overall stronger than responses of the conventional source, and in particular, the field strength amplitudes for an X-direction horizontal magnetic field and a Y-direction horizontal electric field are increased by several orders of magnitude; thus, the problem that such components for the conventional source cannot be effectively observed in the past is solved. Moreover, the resolutions to high-resistivity and low-resistivity anomalies are not weakened.1/12 2 3 Fig. 1