Abstract
SUMMARY Recent developments in electromagnetic double dipole devices make these systems convenient for both magnetic susceptibility and resistivity measurements. The coupling of such an electromagnetic logging tool with a magnetic probe supplying the three components of the total magnetic field in the well, allows in siru determination of magnetic parameters. This paper shows how to (i) interpret the raw data in terms of magnetic susceptibility and resistivity of the surrounding medium (ii) determine the horizontal and vertical components of the total magnetization, and (iii) separate the remanent magnetization which seems to be possible at many points of the logging.
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