In controlled-source electromagnetic exploration, when there are inhomogeneous geological bodies under the field source and between the field source and the receiving point, the traditional artificial field source measurement method will distort the observed electromagnetic field signal, thus affecting the detection accuracy and interpretation accuracy. The invention provides a multi-source electromagnetic measurement method in the whole region, innovatively studies a three-dimensional electromagnetic measurement method of regional multi-source emission and multi-point and multi-direction synchronous observation, and adopts full-band electromagnetic field data for processing and interpretation, so that the influence of field source effect caused by artificial field sources can be suppressed, the exploration precision and depth are improved, and the effective detection depth can reach 5000 meters.
This technology has achieved good application results in the exploration of deep geothermal resources in Beijing, Tianjin and Hebei and the investigation of shale gas in the Yangtze River Economic Belt, providing independent and practical technical support for the exploration of energy resources and deep geological structures in China. (Li Jianhua)