Dictionary:Fig I-4

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FIG. I-4. Induction log. (a) Schematic two-coil induction logging sonde. (b) Dual-induction log. ILd is a deep induction log, ILm a medium induction log. The separation of the resistivity curves shows a variation of resistivity with distance from the borehole, probably because of invasion. Laterolog-8 (LL8) and SP logs were run at the same time. (Courtesy Schlumberger.)