Artificial Source Near-Zone Frequency Domain Electromagnetic Sounding Method

摘要

#$%^&*AU2020100504A420200514.pdf#####Abstract The invention discloses an artificial source near-zone frequency domain electromagnetic sounding method, comprising the following steps of: S1, setting a transmitting source and a receiving system, and observing a total vertical magnetic-field component of an artificial source; S2, calculating a primary vertical component generated by the transmitting source at an observation point; S3, calculating a pure induction electric field generated by the earth at the observation point based on the total vertical magnetic-field component and the primary vertical component generated by the transmitting source; and S4, calculating the resistivity and depth information of the earth based on the pure induction electric field generated by the earth. According to the characteristic that a primary field and an induction field in the vertical magnetic-field component are easy to separate, the invention provides a method for sounding a formation electrical structure by utilizing the pure induction field, and the method is a novel artificial source frequency domain electromagnetic observation and data processing technology, which can significantly shorten a transmitter-receiver distance of artificial source frequency sounding and improve the resolution of the formation electrical structure.1/5 S1, setting a transmitting source and a receiving system, and observing a total vertical magnetic-field component of an artificial source. S2,, calculating a primLoary veBrtical -compon-ent generated by the transmiLttiLng sourc-e at an observation poi-nt. 53, tdi-=latingam uktianelectric field genenated by the emrth at the abservatin maint bsed n the total vertical mEsnetic-field cr- net md the Primerr vertical crminet grated by the tr -i tting source. 54, calculating the resistivity and depth information of the earth based on the pure induction electric field generated by the earth. Fig. 1