A resistivity imaging method based on electrical source semi-airborne transient electromagnetic method

摘要

#$%^&*AU2020101894A420201001.pdf#####ABSTRACT The invention discloses a resistivity imaging method based on electrical source semi-airbome transient electromagnetic method, which includes: setting observation points and detection depths, according to which arranging emission sources and receiving devices; obtain the voltage signal of the electrical source semi-airborne transient electromagnetic field in the vertical direction through the receiving device, and calculate the early, late, and full-period apparent resistivity; obtain the underground induced current distribution of the emitter. According to the lateral and longitudinal components of the induced current, establish the relationship between the imaging depth and the diffusion depth on the lateral and longitudinal components of the induced current, respectively, to obtain the imaging depth when using the transverse and longitudinal response; based on the early, late, and full-period apparent resistivity, and the imaging depth when using the lateral response and the longitudinal response, form a resistivity-imaging depth profile to complete resistivity imaging.-1/8S 1. Setting ob servation points and detection depths, according to which arranging emission sources and receiving devices. 4; S2. Obtain the voltage signal ofthe electrical source electrical source semi-airborne transient electromagnetic field in the vertical direction through the receiving device, and calculate the early,late, andfUll-period apparent resistivity. S3. Obtain the underground induced current distribution ofthe emitter. According to the lateral and longitudinal components ofthe induced current, establish the relationship between the imaging depth and the diffusion depth on the lateral and longitudinal components ofthe induced current, respectively, to obtain the imaging depth when using the transverse and longitudinal response. J1b S4. Based on the early, late, and fll-period apparent resistivity, and the imaging depth when using the lateral response and the longitudinal response, form a resistivity-imaging depth profile to complete resistivity imaging Figure 1