Abstract
Crosshole radio-frequency (typically from 1 to 36 MHz) electromagnetic methods are powerful tools for locating conductive ores and distribution of electric properties of rocks between boreholes. In the range of these frequencies, electromagnetic field can be approximated by the wave field. Usually, crosshole radio-frequency electromagnetic inversion requires exact source intensity but it is difficult to determine that.We present a ray-based inversion method of crosshole radio electromagnetic data which does not require exact source intensity. We introduce a concept of apparent source intensity, establish the method of determining that and realize absorption coefficient and conductivity imaging of crosshole radio electromagnetic data using that. And then we improve accuracy and reliability of tomographic inversion of crosshole radio electromagnetic data using positive constraints for absorption and conductivities. Inversion is based on simultaneous iterative reconstruction technique or adaptive control gradient method.Tests of synthetic and field data show that the method we propose has high reliability.
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