Dictionary:Formation microimager (FMI)

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An electric imager resistivity tool with four arms that unfold from the tool body, each with two pads containing multiple electrode buttons. Yields high-resolution resistivity logs from the high-density of pads; these are displayed as an image of 80–90% of the borehole wall surface. Used to detect fractures and stratigraphic features. Schlumberger tradename. See Figure I-1.